NBY9765 23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ ``````````````````````````````````` গၤ ``````````````````````````````````` ᄂቶ
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NBY9765 23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ ``````````````````````````````````` গၤ ``````````````````````````````````` ᄂቶ
19-0588; Rev 2; 7/09
ৰۇ
భᄋຶ
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
NBY9765 ဵఎਈࢯஂLjၒ߲࢟ኹपᆍᆐ 1/7W ࡵ
1/96 y! W JO Ljᔢࡍభᄋ 9B ࡼঌᏲ࢟ഗăበຢᔫ࢟ኹ
ᆐ5/6Wᒗ25WLjऻޟးঌᏲ࢛ਜ਼ઁኚᆮኹ።ăᏴᑳৈ
ঌᏲĂၒྜྷ࢟ኹਜ਼ᆨࣞܤછपᆍดLjୈၒ߲࢟ኹᇙތ
ቃ᎖±2&ă
``````````````````````````````````` ᄂቶ
♦ ดᒙSET)PO*ᆐ37nΩࡼNPTGFU
♦ ۣᑺ9Bၒ߲࢟ഗ
♦ భࢯஂࡼਭഗۣઐ
♦ ᑳৈᔫᆨࣞपᆍดၒ߲றࣞᆐ2&
NBY9765ဵጙৼࢾຫൈQXNෝါࢯஂLjఎਈຫൈభ
ᎅᅪ࢟ݝᔜᒙ TZOD ၒྜྷᄴݛLjपᆍ᎖ 361lI{ ࡵ
2/3NI{ ᒄମă୷ࡼᔫຫൈᏤဧཝჿࠣ࢟ྏଐ
ऱښăTZODPVUၒ߲᎖ᄴݛऔৈࢯஂLjဧဣሚ
Ꭷጙৈࢯஂࡇሤ291°ᔫLjጲଢ଼ࢅၒྜྷᆬ݆࢟ഗLj࠭
ऎିቃჅኊၒྜྷ࢟ྏᒋă୷ࡼᔫຫൈᅪݝᏄୈࡼ
ߛࡁିࡵᔢቃă
♦ 5/6Wᒗ25Wᔫ࢟ኹ
ຢࢅSET)PO*ࡼၷoNPTଐۣᑺ࢟വᏴᒮᏲᓨზሆ྆ถ
ۣߒ୷ࢅᆨࣞLj݀ဧ࢟ঢᔢቃLjᎧॊೂᏄୈଐሤ܈Lj
কୈࡼݚৎଝ଼ă
♦ 47୭Ă7nn! y! 7nnۡቯRGOᇄॖᓤ
NBY9765ด߅ૹݝጙৈࡒ)31NI{*࢟ኹᇙތहࡍă࢟
ኹෝါ఼ᒜஉ৩ਜ਼࢟ኹᇙތᏥႯहࡍᏤဧƱቯݗ
ޡऱښLjဧણവࡒᔢࡍభࡉఎਈຫൈࡼ31&ă୷ࡼણ
വࡒถ৫ۣᑺႥࡼၾზሰ።Lj࠭ऎିቃჅኊࡼၒ߲
࢟ྏᒋă
NBY9765 ᄋభྟࡼ߈ܠࣅෝါLjጲး።ݙᄴಢቯࡼ
ၒ߲࢟ྏLj݀ଢ଼ࢅၒྜྷ፻࢟ഗăNBY9765ݧ47୭Ă
ۡቯRGOॖᓤă
```````````````````````````````````` ።
QPM࢟Ꮞ
♦ 1/7Wࡵ1/96! y! WJO ࡼభࢯၒ߲࢟ኹ
♦ ྟࣅିቃ፻࢟ഗ
♦ 361lI{ᒗ2/3NI{భࢯࡼఎਈຫൈTZODၒྜྷ
♦ ถ৫ဧჿࠣĂᇕૺ࢟ஊၒ߲࢟ྏ
♦ TZODPVUᄴݛऔࢯஂLjဣሚ291°ࡇሤᔫ
``````````````````````````````` ࢾ৪ቧᇦ
PART
MAX8654ETX+
TEMP RANGE
PINPACKAGE
-40°C to +85°C
36 Thin QFN-EP*
,ܭာᇄ)Qc*0९SpITܪᓰࡼॖᓤă
*FQ! >! ൡă
``````````````````````````` ࢜ቯᔫ࢟വ
INPUT
4.5V TO 14V
IN
BST
OUTPUT
UP TO 8A
VP
ॲᇗ
LX
VL
EESࡀ
VL
VDL
SBJE࢟Ꮞ
ᆀ࢟Ꮞ
PGND
MAX8654
ᅄተఌ
FREQ
ILIM
REFIN
FB
COMP
SS
SYNC
SYNCOUT
VL
IN
PWRGD
EN
GND
୭ᒙᏴၫᓾ೯ࡼᔢઁ߲ă
________________________________________________________________ Maxim Integrated Products
1
۾ᆪဵ፞ᆪၫᓾ೯ࡼፉᆪLjᆪᒦభถࡀᏴडፉࡼݙᓰཀྵࡇᇙăྙኊጙݛཀྵཱྀLj༿Ᏼิࡼଐᒦݬఠ፞ᆪᓾ೯ă
ᎌਈଥৃĂૡૺࢿ৪ቧᇦLj༿ೊNbyjnᒴሾ၉ᒦቦǖ21911!963!235:!)۱ᒦਪཌ*Lj21911!263!235:!)ฉᒦਪཌ*Lj
षᆰNbyjnࡼᒦᆪᆀᐶǖdijob/nbyjn.jd/dpnă
NBY9765
``````````````````````````````````` গၤ
NBY9765
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
ABSOLUTE MAXIMUM RATINGS
SYNC, VL, PWRGD to GND...................................-0.3V to +4.5V
SYNCOUT, COMP, SS, FB,
REFIN, ILIM, FREQ to GND .....................-0.3V to (VVL + 0.3V)
VDL to PGND............................................................-0.3V to +6V
VP, IN, EN to GND..................................................-0.3V to +16V
LX Current (Note 1: -12A to +12A)
BST to LX .………………………………………………-0.3V to +6V
BST to GND ……………………………………..-0.3V to (VIN + 6V)
PGND to GND .......................................................-0.3V to +0.3V
Continuous Power Dissipation (TA = +70°C)
36-Pin Thin QFN (derate 35.7mW/°C above +70°C) ...2857.1mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......………………………………….+150°C
Storage Temperature Range .............................-65°C to +150°C
Thermal Resistance Junction to Exposed Pad (EP)...........3°C/W
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: LX has internal clamp diodes to PGND and IN. Applications that forward bias these diodes should take care not to exceed
the IC’s package power-dissipation limits.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = VEN = VVP = 12V, VVDL = 5V, VVL = 3.3V, VSYNC = 0V, VFB = 0.5V, TA = -40°C to +85°C, typical values are at TA = +25°C,
unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
14
V
5.5
V
IN/VP
IN and VP Voltage Range
4.5
VDL Voltage Range
VP = VDL
VL Output Voltage
IVL = 5mA
VDL Output Voltage
IVDL = 50mA
IN + VP Supply Current
fS = 500kHz, no load,
L = 1.5μH
4.5
Not switching, no load
3.3
V
5
V
2.7
VIN = 12V
45
VIN = 4.5V
28
mA
VL Supply Current
fS = 500kHz, VVL = 3.8V from separate supply
1.6
VDL Supply Current
fS = 500kHz, VVDL = 5.5V from separate supply
25
IN + VP Shutdown Current
VP = VIN = 13.2V, VEN = VVDL = VVL = unconnected
10
20
VL Undervoltage Lockout
Threshold
LX starts/stops switching,
2μs rising/falling edge deglitch
3
3.1
VDL and IN Undervoltage
Lockout Threshold
LX starts/stops switching,
3μs rising/falling edge deglitch
VVL rising
VVL falling
2.8
mA
2.9
VIN rising
VIN falling
mA
4.4
3.8
μA
V
V
BST
BST Shutdown Supply Current
VEN = 0V, VIN = VVP = VBST = VVDL = 5V
10
μA
PWM COMPARATOR
PWM Comparator Propagation
Delay
5mV overdrive
16
ns
COMP
COMP Clamp Voltage, High
COMP Slew Rate
COMP Shutdown Resistance
2
From COMP to GND, VEN = 0V
1.8
V
7
V/μs
7
Ω
_______________________________________________________________________________________
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
(VIN = VEN = VVP = 12V, VVDL = 5V, VVL = 3.3V, VSYNC = 0V, VFB = 0.5V, TA = -40°C to +85°C, typical values are at TA = +25°C,
unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
0.594
0.6
0.606
UNITS
ERROR-AMPLIFIER
FB Regulation Voltage
VP = VIN = 4.5V to 14V
Open-Loop Voltage Gain
1kΩ from COMP to GND
95
dB
Error-Amplifier Unity-Gain
Bandwidth
Parallel 10kΩ, 160pF from COMP to GND
20
MHz
Error-Amplifier Common-Mode
Input Range
0
Error-Amplifier Maximum Output
Current
VCOMP = 1V
FB Input Bias Current
VFB = 0.6V
1.5
1
V
V
mA
-35
nA
REFIN
REFIN Input Bias Current
VREFIN = 0.6V
-60
REFIN Common-Mode Range
0
nA
1.5
V
36
64
mΩ
25
40
mΩ
LX (All Pins Combined)
LX On-Resistance, High Side
ILX = -180mA
LX On-Resistance, Low Side
ILX = 180mA
LX Current-Limit Threshold
RILIM = 100kΩ
VBST - VLX = 5V
Sourcing
7
8
10
Sinking
7
8
10
RILIM Range
40
LX Leakage Current
VEN = 0V
LX Switching Frequency
RFREQ Range
200
VLX = 14V = VIN
+50
VLX = 0V, VIN = 14V
-50
RFREQ = 50kΩ
0.85
1
1.1
RFREQ = 100kΩ
0.45
0.5
0.55
50
LX Minimum On-Time
Maximum RMS LX Output Current
200
80
(Note 2)
A
kΩ
μA
MHz
kΩ
ns
10.5
A
EN/SS
EN Input Logic-Low Threshold
0.6
EN Input Logic-High Threshold
1.2
V
VEN = 0V
EN Input Current
1
VEN = 14V
SS Charging Current
VSS = 0.45V
7
6
V
8
10
μA
μA
500
Ω
Current-Limit Startup Blanking
110
Clock
cycles
Restart Time
900
Clock
cycles
REFIN Discharge Resistance
_______________________________________________________________________________________
3
NBY9765
ELECTRICAL CHARACTERISTICS (continued)
NBY9765
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VEN = VVP = 12V, VVDL = 5V, VVL = 3.3V, VSYNC = 0V, VFB = 0.5V, TA = -40°C to +85°C, typical values are at TA = +25°C,
unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
1.20
MHz
SYNC
SYNC Capture Range
SYNC Pulse Width
SYNC Input Threshold
SYNC Input Current
0.25
tLO
100
tHI
100
VIL
0.4
ns
VIH
VSYNC = 0V or 3.6V
1.6
V
IIL
10
nA
IIH
7
μA
SYNCOUT
SYNCOUT Frequency Range
0.25
SYNCOUT Phase Shift from
SYNCIN or Internal Oscillator
Frequency = 1MHz
SYNCOUT Output Voltage
ISYNCOUT = ±1mA
170
VOH
180
1.2
MHz
190
Degrees
VVL - 0.4
VOL
0.2
V
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
When LX stops switching
Thermal-Shutdown Hysteresis
+165
°C
20
°C
90
% of
REFIN
48
Clock
cycles
POWER-GOOD
PWRGD Threshold Voltage
VFB falling, 30mV hysteresis, VREFIN > 540mV
PWRGD Falling Edge Deglitch
PWRGD Output Voltage Low
IPWRGD = 4mA
0.03
0.06
V
PWRGD Leakage Current
VPWRGD = 5.5V, VFB = 0.9V
0.01
1
μA
Note 2: All devices are production tested at TA = +25°C. Limits over the operating range are guaranteed by design.
4
_______________________________________________________________________________________
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
VOUT = 3.3V
40
VOUT = 3.3V
VOUT = 1.8V
40
50
30
20
20
10
10
10
REFERENCE VOLTAGE vs. TEMPERATURE
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
0.595
SWITCHING FREQUENCY vs. RFREQ
1200
MAX8654 toc05
MAX8654 toc04
0.600
1000
800
600
400
1400
200
-25
0
25
50
75
100
7
9
11
13
TEMPERATURE (°C)
INPUT VOLTAGE (V)
LOAD REGULATION
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE
-0.10
-0.15
VOUT = 1.8V
-0.20
-0.25
-0.30
0
1
2
3
4
5
LOAD CURRENT (A)
6
7
8
400
50
100
150
200
250
RFREQ (kΩ)
10
CURRENT LIMIT vs. OUTPUT VOLTAGE
9
8
7
6
5
4
3
9.0
8.8
8.6
8.4
8.2
8.0
7.8
7.6
2
7.4
1
7.2
0
-0.35
600
0
CURRENT LIMIT (A)
VOUT = 3.3V
-0.05
800
15
MAX8654 toc08
MAX8654 toc07
0
1000
0
5
125
SHUTDOWN SUPPLY CURRENT (μA)
-50
1200
200
0
0.590
10
1
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
0.605
0.1
10
OUTPUT CURRENT (A)
0.610
VIN = VVP = 12V, fS = 500kHz
0
1
0.1
SWITCHING FREQUENCY (kHz)
1
VOUT = 1.8V
10
VIN = VVP = 5V, fS = 500kHz
0
VOUT = 3.3V
40
30
VIN = 12V, VVDL = VVP = 5V, fS = 500kHz
MAX8654 toc03
60
20
0.1
OUTPUT VOLTAGE CHANGE (%)
70
30
0
REFERENCE VOLTAGE (V)
60
50
80
MAX8654 toc09
VOUT = 1.8V
70
VOUT = 5V
90
EFFICIENCY (%)
VOUT = 5V
50
80
EFFICIENCY (%)
70
90
SWITCHING FREQUENCY (kHz)
EFFICIENCY (%)
80
100
MAX8654 toc02
MAX8654 toc01
90
60
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
100
MAX8654 toc06
EFFICIENCY vs. LOAD CURRENT
100
7.0
0
2
4
6
8
10
INPUT VOLTAGE (V)
12
14
1.5
.2.0
2.5
3.0
3.5
OUTPUT VOLTAGE (V)
_______________________________________________________________________________________
5
NBY9765
`````````````````````````````````````````````````````````````````````` ࢜ቯᔫᄂቶ
(Typical values are: VIN = VVP = 12V, VOUT = 3.3V, RFREQ = 100kΩ, and TA = +25°C, circuit of Figure 1.)
``````````````````````````````````````````````````````````````````` ࢜ቯᔫᄂቶ)ኚ*
(Typical values are: VIN = VVP = 12V, VOUT = 3.3V, RFREQ = 100kΩ, and TA = +25°C, circuit of Figure 1.)
EXPOSED PAD TEMPERATURE
vs. LOAD CURRENT
80
TA = +85°C, 200LFM
60
TA = +25°C, NO AIR FLOW
40
20
TA = +25°C, 200LFM
0
TA = -40°C, NO AIR FLOW
-20
ILOAD = 0A
0.1
MAX8654 toc11
100
0.2
OUTPUT VOLTAGE CHANGE (%)
TA = +85°C, NO AIR FLOW
120
EXPOSED PAD TEMPERATURE (°C)
LINE REGULATION
MAX8654 toc10
140
ILOAD = 3A
0
-0.1
-0.2
ILOAD = 6A
-0.3
-40
TA = -40°C, 200LFM
0
2
-0.4
4
6
5
8
7
9
11
13
15
INPUT VOLTAGE (V)
LOAD CURRENT (A)
RMS INPUT CURRENT DURING
OUTPUT SHORT CIRCUIT
SHORT-CIRCUIT RESPONSE
MAX8654 toc12
0.50
CSS = 1000pF
VOUT = 3.3V
0.45
2V/div
0V
IOUT
5A/div
0
0.40
RMS INPUT CURRENT (A)
VOUT
MAX8654 toc13
-60
CSS = 1000pF
0.35
0.30
0.25
CSS = 22,000pF
0.20
CSS = 10,000pF
0.15
0.10
1A/div
0
IIN
0.05
0
400μs/div
5
7
9
11
13
INPUT VOLTAGE (V)
RMS OUTPUT CURRENT DURING
OUTPUT SHORT CIRCUIT
3.5
3.0
20
0
-20
IOUT = 6A
-40
0.1
2.5
1
10
7
9
INPUT VOLTAGE (V)
11
1000
83.3
0
-83.3
106.57946kHz
CPI
-166.6
1.0
5
100
166.6
CSS = 10,000pF
PHASE (DEG)
CSS = 1000pF
2.0
1.5
6
106.57946kHz
CPI
40
MAX8654 toc15
CSS = 22,000pF
GAIN (dB)
VOUT = 3.3V
OPEN-LOOP FREQUENCY RESPONSE
MAX8654 toc14
4.0
RMS OUTPUT CURRENT (A)
NBY9765
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
13
0.1
1
10
100
FREQUENCY (kHz)
_______________________________________________________________________________________
1000
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
SOFT-START TIME
vs. CSS
LOAD TRANSIENT
MAX8654 toc16
MAX8654 toc17
10
9
AC-COUPLED
IOUT
2A/div
8
SOFT-START TIME (ms)
100mV/div
VOUT
7
6
5
4
3
2
0A
1
0
20μs/div
0
0.025
0.050 0.075
0.100 0.125 0.150
CSS (μF)
STARTUP INTO A 0.5Ω LOAD
MAX8654 toc18
10V/div
VEN
0V
2A/div
IIN
0
2V/div
VOUT
0V
VPWRGD
2V/div
0V
200μs/div
SOFT-START WITH REFIN
INTO A 0.5Ω LOAD
SYNCHRONIZED OPERATION (NO LOAD)
MAX8654 toc20
MAX8654 toc19
500mV/div
VREFIN
0V
10mV/div
VLX1
0V
2A/div
IIN
0
10V/div
VLX2
0V
2V/div
VOUT
0V
ILX1
2A/div
VPWRGD
2V/div
0V
40μs/div
ILX2
2A/div
400ns/div
_______________________________________________________________________________________
7
NBY9765
``````````````````````````````````````````````````````````````````` ࢜ቯᔫᄂቶ)ኚ*
(Typical values are: VIN = VVP = 12V, VOUT = 3.3V, RFREQ = 100kΩ, and TA = +25°C, circuit of Figure 1.)
NBY9765
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
```````````````````````````````````````````````````````````````````````````` ୭ႁී
୭
߂
1, 2, 3, 34,
35, 36
PGND
4
VDL
5–8
IN
࢟Ꮞၒྜྷăၒྜྷ࢟ኹपᆍᆐ5/6Wᒗ25Wăݧೝৈ21μGਜ਼ጙৈ1/2μGࡼჿࠣ࢟ྏവᒗQHOELjྙᅄ2Ⴥာă
9
VP
ดݝ6W! MEPᆮኹၒྜྷăྙਫᎌ6W࢟ᏎLjᐌᒗJO୭ăᅪ6W࢟ᏎLjᐌணดݝ6Wᆮኹă
10
VL
4/4W! MEPLj᎖በຢดݝ࢟ăጙৈ2μGჿࠣ࢟ྏവᒗHOEă
11
ILIM
12
FREQ
ᑩຫൈኡᐋăᏴGSFRਜ਼HOEᒄମೌጙৈ࢟ᔜLj᎖ࢾดݝᑩຫൈăሮᇼቧᇦLj
༿ݬຫൈኡᐋ)GSFR*ݝॊă
13, 32
GND
ෝผă
14
REFIN
15
SS
ྟࣅၒྜྷăᏴTTਜ਼HOEᒄମೌጙৈ࢟ྏLjጲᒙࣅဟମăᎌਈᒙྟࣅဟମࡼሮᇼቧᇦLj
༿ݬఠྟࣅਜ਼SFGJO ݝॊă
16
COMP
ࢯஂޡݗăᏴDPNQᎧGCᒄମೌܘገࡼޡݗᆀăJDࠀ᎖ਈࣥෝါဟLjDPNQดೌݝᒗHOEă
17
FB
नౣၒྜྷăGCೌᒗၒ߲ਜ਼HOEᒄମᅪ࢟ݝᔜॊኹࡼᒦቦߥᄿLjጲᒙၒ߲࢟ኹăሮᇼቧᇦLj
༿ݬޡݗଐݝॊă
18
PWRGD
19
SYNCOUT
20
SYNC
21
BST
22–29
LX
30, 33
N.C.
31
EN
ၒྜྷဧถă൝ၒྜྷ᎖ဧถ0ணᒏNBY9765ăFOᆐ࢟ຳဟୈဧถLjࢅ࢟ຳဟୈྜྷࢅਈࣥෝါă
—
EP
ൡăೌᒗࡍෂ૩QHOEށLjጲᎁછྲེቶถăFQᏴดݝᎧHOEᎧQHOEሤೌă
8
ถ
ൈăჅᎌQHOEᏴดೌݝᏴጙăჅᎌQHOE୭Ᏼᅪࡵೌݝൈށă
6W! MEPၒ߲ăWEMᆐดݝNPTGFUᄋᐜདࣅ࢟ഗLj݀ᆐCTU࢟ྏߠ࢟ăገཇݧᒗ3/3μGࡼ
ჿࠣ࢟ྏവWEMᒗQHOEă
࢟ഗሢᒜࢯஂăJMJNᎧHOEᒄମೌጙৈ࢟ᔜSJMJNLjJJMJN >! 2W! 0! SJMJNăJJMJN ࢾ೫MYሢഗඡሢᒋă
ሮᇼቧᇦLj༿ݬ࢟ഗሢᒜݝॊă
ᅪݝᓰၒྜྷăೌᒗᅪݝᓰăࢯஂGCᒗSFGJOࡼ࢟ኹăೌSFGJOᒗTTဟLjဧดݝ1/7Wᓰă
JDࠀ᎖ਈࣥෝါဟLjSFGJOดݝ౯ᒗHOEă
࢟Ꮞኙၒ߲ăࡩWGC ≥ ):1&! y! WSFGJO*ጲૺWSFGJO ?! 651nWဟLjఎധၒ߲ᆐᔜზăࡩJDࠀ᎖ਈࣥෝါĂ
ᑗࡩWWEMĂWJO WWM ࢅ᎖VWMPඡሢLjᑗࡩJDࠀ᎖ེਈࣥෝါဟLjQXSHEۻดݝ౯ࢅă
ᑩၒ߲ăTZODPVUၒ߲Ꭷดݝᑩሤᆡሤތ291°LjభጲဧऔࢯஂᎧጙৈࢯஂဣሚࡇሤᔫLj
࠭ऎଢ଼ࢅၒྜྷᆬ݆ă
ᄴݛၒྜྷăᎧ361lI{ᒗ2/3NI{ࡼᅪݝဟᒩᄴݛăTZODೌᒗHOELjணᄴݛถă
ܟNPTGFUདࣅ࢟Ꮞăݧጙৈ1/33μGჿࠣ࢟ྏവCTUᒗMYă
࢟ঢೌ࣡ăჅᎌMY୭ᏴดೌݝᏴጙăೌჅᎌMY୭ᒗ࢟ঢࡼఎਈݾăJDࠀ᎖ਈࣥෝါဟLj
MYᆐᔜზă
ᇄดೌݝă
_______________________________________________________________________________________
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
VL
EN
SHUTDOWN
CONTROL
VL
REG
UVLO
CIRCUITRY
MAX8654
VDL
REG
VP
CURRENT-LIMIT
COMPARATOR
BIAS
GENERATOR
ILIM
ILIM
THRESHOLD
LX
BST
VOLTAGE
REFERENCE
SS
BST CAPACITOR
CHARGING SWITCH
SOFT-START
ERROR
AMPLIFIER
LX
CONTROL
LOGIC
THERMAL
SHUTDOWN
REFIN
IN
LX
PWM
COMPARATOR
PGND
VDL
FB
COMP
1VP-P
COMP LOW
DETECTOR
FREQ
SYNC
SYNCOUT
OSCILLATOR
FB
SHDN
PWRGD
90% REFIN
REFIN
0.54V
GND
_______________________________________________________________________________________
9
NBY9765
````````````````````````````````````````````````````````````````````````````` ऱౖᅄ
NBY9765
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
INPUT
4.5V TO 14V
IN
10μF
10μF
0.1μF
BST
VP
0.22μF
OUTPUT
3.3V, 8A
1.0μH
LX
MAX8654
2 x 22μF
VL
VL
PGND
4.99kΩ
VDL
1μF
1nF
100Ω
2.2μF
FB
FREQ
3.57kΩ
1.1kΩ
ILIM
10nF
REFIN
100kΩ
75kΩ
22pF
COMP
SS
SYNC
0.022μF
VL
SYNCOUT
IN
20kΩ
EN
GND
PWRGD
ᅄ2/! ࢜ቯ።࢟വLj4/4WĂ9Bၒ߲LjᔫᏴ611lI{
``````````````````````````````` ሮᇼႁී
NBY9765 ᆐൈĂ࢟ኹෝါఎਈࢯஂLjᔢࡍభᄋ
9Bࡼၒ߲࢟ഗăNBY9765ᔫᏴ5/6Wࡵ25Wࡼၒྜྷ࢟ኹ
पᆍดLjభጲᄋ 1/7W ᒗ1/96 y WJO ࡼၒ߲࢟ኹLjဧऻ
ޟးঌᏲ࢛።ăᏴᑳৈᔫᆨࣞܤછपᆍดLjୈ
ၒ߲࢟ኹறࣞᎁ᎖±2&ă
NBY9765 భဣሚཝჿࠣ࢟ྏଐਜ਼Ⴅࡼၾზሰ።ăক
ᇹୈݧ 7nn y 7nnĂ47 ୭ۡቯ RGO.FQ ॖᓤă
TZODPVUถᏤᔢᒫઓᏴဧೝຢNBY9765ဟLjถ
৫ጲ291°ࡇሤᔫ᎖ሤᄴఎਈຫൈLjିቃၒྜྷᆬ݆࢟ഗLj
10
࠭ऎଢ଼ࢅ࣪ၒྜྷ࢟ྏࡼገཇăSFGJO ถဧ NBY9765 ऻ
ޟး᎖ EES ਜ਼࢟ᏎৌႲăܟਜ਼ࢅܟఎਈݧࢅ
SET)PO*ࡼดݝoࡸNPTGFULjဧࡻୈᏴᒮᏲਜ਼ఎਈ
ຫൈሆ྆ᎌൈă
NBY9765ݧ࢟ኹෝါ఼ᒜஉ৩Ljࡒᎌࡒ)31NI{*ᇙތ
हࡍă࢟ኹ఼ᒜஉ৩Ꮴࡉ2/3NI{ࡼఎਈຫൈLjି
ቃ೫࢟വۇෂ૩ă࢟ኹᇙތᏥႯहࡍݧƱቯޡݗऱ
ښLjߠॊಽఎਈຫൈࡼࡒLjጲࡻႥၾზሰ።ă
భࢯஂࡼྟࣅဟମဣሚഉᒙLjିቃ೫ၒྜྷ፻࢟
ഗăࡩၒ߲ࡉࡵᆮࢾᒋࡼ:1&ဟLj࢟Ꮞኙ)QXSHE*ఎധ
ၒ߲ܤᆐᔜზă
______________________________________________________________________________________
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
఼ᒜ൝࢟വᆐᒦያࠀಯLjࢾݙᄴၒྜྷ࢟ኹĂ
ঌᏲਜ਼ᆨࣞᄟୈሆࡼܟNPTGFUࡼᐴహ܈ăᑵޟᔫᄟ
ୈሆLj࢟ഗሢᒜਜ਼ᆨۣࣞઐᆚ߿खLj఼ᒜ൝࢟വ
၃QXN୷܈ࡼၒ߲Ljޘညܟਜ਼ࢅܟNPTGFUࡼདࣅ
ቧăሌࣥઁ൝ਜ਼ᔈ࢟ྏߠ࢟ࡼဟኔ၊఼᎖఼ᒜ
൝࢟വă࢟ኹᇙތहࡍޘညࡼᇙތቧᎧᑩ
ޘညࡼቓຸቧᄰਭQXN୷܈ቲ୷܈LjᎅࠥޘညჅ
ኊࡼQXNቧăܟఎਈᏴᑩᒲ໐ࡼఎဪࣤࡴᄰLj
ࡩቓຸ࢟ኹިਭ W DPNQ ቧ࢟ኹᑗި߲ሢഗඡሢဟਈ
ࣥăႲઁLjᏴᑩࡼထᒲ໐ดLjࢅ࣡ఎਈۣߒࡴᄰă
࢟ഗሢᒜ
NBY9765ࡼ࢟ഗሢᒜᎅጙৈೌᏴJMJNᎧHOEᒄମࡼ࢟
ᔜSJMJN ࢾăഗਭSJMJN ࡼ࢟ഗࢾ೫MY࢟ഗඡሢࡼ߿
ख࢛ǖ
RILIM (kΩ) = 800 / ILXLIM (A)
ᒦLjJMYMJN ဵMYࡼሢഗᒋăSJMJN ࡼᎌपᆍဵ51lΩࡵ
311lΩă211lΩࡼSJMJN ࣪።9BࡼMYᇢྜྷᏎ߲ख़ᒋ࢟ഗ
ඡሢ࢜ቯᒋă
ࡩ࠭MYഗ߲ࡼ࢟ഗި߲ࠥሢᒜᒋဟLjܟNPTGFUਈܕLj
ᄴဟᄴݛᑳഗࡌఎăᄴݛᑳഗጙᒇۣߒఎᓨზLj
ᒇࡵ࢟ঢ࢟ഗࢰൢᒗࢅܟሢഗᒋጲሆăᑚዹଢ଼ࢅᐴహ
݀܈ଢ଼ࢅၒ߲࢟ኹLjᒇᒗݙᏳި߲࢟ഗሢᒋă
ࡩިਭनሶ࢟ഗඡሢဟLjୈਈࣥᄴݛᑳഗLjဧ࢟
ঢ࢟ഗᄰਭܟNPTGFUࡼᄏऔኚഗLjऩૄၒྜྷ࣡ă
ᑚዹጙᒇߒኚࡵሆጙᒲ໐ఎဪ࢟ঢ࢟ഗଢ଼ࡵഃᒋă
NBY9765ݧĐࡌᡅđෝါLjܜखညၒ߲വဟበຢਭ
ེăࡩWGC ࢅ᎖531nW݀༦ࢅ᎖ক࢟ຳࡼဟମިਭ23μtဟLj
ୈྜྷࡌᡅෝါLjᄴဟDPNQਜ਼SFGJOۻ౯ࢅăୈਈ
ࣥ :11 ৈဟᒩᒲ໐LjႲઁࡼ 221 ৈဟᒩᒲ໐ྜྷྟࣅෝ
ါăྙਫവᓨზጞۣߒLjୈᏳࠨਈࣥ623ৈဟᒩ
ᒲ໐ăJDᒮআጲࣅᔫLjᒇᒗവ৺ᑇሿ߹ă
ྟࣅਜ਼SFGJO
NBY9765 ಽభྟࡼ߈ܠࣅถሢᒜࣅਭ߈ᒦࡼ
፻࢟ഗă9μB )࢜ቯᒋ*࢟ഗᏎ࣪ೌᏴTTࡼᅪྏ࢟ݝ
ቲߠ࢟Ljጲ၊఼ऱါᐐࡍ࢟ྏ࢟ኹăྟࣅဟମᎅೌ
ᏴTTᒗHOEᒄମࡼᅪྏ࢟ݝᒋࢯஂăჅኊࡼ࢟ྏᒋᎅ
ሆါࢾǖ
C=
8μA × t SS
0.6V
ᒦLjuTT ᆐჅኊࡼྟࣅဟମLjᆡᆐă
NBY9765થభጲᅪᓰၒྜྷ)SFGJO*ăJDᄰਭࢯஂGCLj
ဧᆮࢾᏴSFGJO࢟ኹăݧᅪݝᓰဟLjดྟݝࣅ
ᇄăᅄ 3 ჅာᆐݧᅪݝᓰဟLjဧྟࣅࡼऱजă
ࡩݧᅪݝᓰဟLjᆐ೫ܜᏴྟࣅਭ߈ᒦ࢟ഗިሢLj
ገۣᑺሆါਈᇹ߅ೂǖ
COUT ×
dVREFIN
I
+ IOUT < ILXLIM − P−P
dt
2
ᒦJPVU ဵၒ߲࢟ഗࡼᔢࡍᒋLjDPVU ဵၒ߲࢟ྏLjJQ.Q ဵ
࢟ঢᆬ݆࢟ഗख़.ख़ᒋă
ೌSFGJOᒗTTLjጲဧดݝ1/7Wᓰă
R1
REFIN
R2
C
MAX8654
ᅄ3/! ݧᅪݝᓰဟLj࢜ቯࡼྟࣅဣሚऱज
______________________________________________________________________________________
11
NBY9765
఼ᒜถ
NBY9765
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
་ኹჄࢾ)VWMP*
ྦWJO WWEM ࢅ᎖5/31W )࢜ቯᒋ*WWM ࢅ᎖4WLjVWMP࢟
വணᒏఎਈࣅᔫăጙࡡᑚቋ࢟ኹဍᒗඡሢᒋጲLj
VWMPஊ߹LjᏳࠨఎဪྟࣅਭ߈ăดᒙ211nWᒣૄLj
᎖ጴᒜ൴ߡছཷă
ਈࣥෝါ
དࣅFOᒗHOEጲਈࣥJDLjࠥဟஸზ࢟ഗଢ଼ᒗ21μB )࢜
ቯᒋ*ăਈࣥ໐ମLjNBY9765ࡼၒ߲ဵᔜზăདࣅFOᒗ
࢟ຳLjဧถNBY9765ă
ེۣઐ
ܟNPTGFUདࣅ࢟)CTU*
ܟo ࡸఎਈࡼᐜདࣅ࢟ኹᎅऽ࢟ྏဍኹ࢟വޘညă
ࡩࢅ ܟNPTGFU ࡴᄰဟLjೌᏴ CTU ୭ਜ਼ MY ୭ᒄମ
ࡼᑚৈ࢟ྏᎅWEM࢟Ꮞߠ࢟ăࡩࢅܟNPTGFUਈࣥဟLj
ऽ࢟ྏࡼ࢟ኹࢶଝࡵMY ࣡࢟ኹLjᆐดݝܟNPTGFU
ᄋܘኊࡼࡴᄰ࢟ኹă
ེਭᏲۣઐถሢᒜୈࡼᔐăࡩஉᆨUK ިਭ,276°D
ဟLjᆨࣞࠅঢ༓ᒜୈྜྷਈࣥᓨზLjጲଢ଼ࢅበᆨ
ࣞăࡩஉᆨሆଢ଼31°DጲઁLjᆨࣞࠅঢᏳࠨࣅୈLj
ᏴೌኚਭᏲᄟୈሆମቌၒ߲ăེਈࣥਭ߈உၦઁLjᒮ
ቤఎဪྟࣅਭ߈ă
``````````````````````````````` ።ቧᇦ
ຫൈኡᐋ)GSFR*
ৼࢾຫൈQXNෝါࡼఎਈຫൈభᎅጙৈ࢟ᔜᏴ361lI{ᒗ
2/3NI{पᆍดቲ߈ܠࢾăಽೌᏴGSFRਜ਼HOEᒄ
ମࡼ࢟ᔜ)SGSFR*ᒙJDࡼఎਈຫൈăSGSFR ଐႯါྙሆǖ
⎛1
⎞
RFREQ = 52.63 × ⎜ − 0.05⎟ kΩ
⎝ fS
⎠
WMਜ਼WEMབྷẮ
ᆐିᎅ᎖ఎਈຫൈࡴᒘࡼᐅဉLj݀ဧNBY9765ၒ߲
றࣞᔢLjᏴWEMਜ਼QHOEᒄମೌጙৈ3/3μGࡼჿࠣ࢟
ྏ࣪ WEM ቲབྷẮăᄴဟLjᏴ WM ਜ਼ HOE ᒄମೌጙৈ
2μG ࡼჿࠣ࢟ྏ࣪ WM ቲབྷẮăᑚቋ࢟ྏభถణத
ሤ።୭हᒙă
࢟ঢኡᐋ
ᒦLjgT ᆐჅ໐ᆃࡼఎਈຫൈLjᆡᆐNI{ă
TZODถ)TZODĂTZODPVU*
NBY9765ᎌTZODถLjభဧఎਈຫൈᎧ᎖ดݝဟᒩ
ຫൈࡼྀੜᅪݝဟᒩᄴݛăຫൈᏴਖࢾपᆍดࡼऱ݆
དࣅTZODăTZODဍዘ߿खดݝTZOD࢟വăTZOD
HOEဟLjணᒏࠥถLj༦ࣅดݝᑩă
TZODPVUၒ߲ᎧดݝᑩTZODቧሤތ291° ࡼဟ
ᒩቧăᄴݛጙৈNBY9765ࢯஂLjဣሚ291° ࡇሤ
ᔫLjᎌᓐ᎖ିቃၒྜྷᆬ݆࢟ഗă
࢟Ꮞኙၒ߲)QXSHE*
ጙࡡྟࣅਭ߈உၦLj૾WSFGJO ࡍ᎖1/65WጲૺWGC ࡍ᎖
):1& y WSFGJO*ဟLjQXSHEఎധၒ߲ܤᆐᔜზăࡩWGC
ቃ᎖):1& y WSFGJO*LjᄴဟWSFGJO ቃ᎖1/65W݀༦ߒኚᒗ
59 ৈဟᒩᒲ໐ဟLjQXSHE ౯ᒗࢅ࢟ຳăQXSHE ౯ᒗ
WWM ဟLjᏴਈࣥෝါሆܤᆐࢅ࢟ຳă
12
ږᑍሆෂࡼါኡᐋ࢟ঢǖ
L=
VOUT x (VIN − VOUT )
fS x VIN x LIR x IOUT(MAX)
ᒦLjMJSᆐᔢቃᐴహ܈ሆ࢟ঢᆬ݆࢟ഗᎧຳߒኚ࢟ഗ
ࡼ܈ᒋăገࡻࡵᔢଛࡼቶถਜ਼ᆮࢾቶLjኡᐋMJSဧ᎖
31&ᒗ51&ă
ᏴࢾࡼߛࡁሆLjኡᐋᒇഗ࢟ᔜభถቃࡼ࢟ঢLjጲଢ଼
ࢅ࢟ঢႼăఠࡵቶถLjᄰޟॏᓨᄤድᄏࠟበ࢟ঢဵ
ᔢଛኡᐋăݙ൙ݧੜᒬࠟበLjࠟበܘኍᔗ৫ࡍLjጲཀྵ
ۣᏴख़ᒋ࢟ঢ࢟ഗ)JQFBL*ሆۥݙਜ਼ăJQFBL ଐႯါྙሆǖ
IPEAK = (1 +
LIR
) x IOUT(MAX)
2
______________________________________________________________________________________
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
ኡᐋၒ߲࢟ྏࡼਈݬၫဵ࢟ྏᒋĂFTSĂFTMጲૺऄࢾ
࢟ኹăᑚቋݬၫ፬ሰࡵ೫ ED.ED ᓞધᑳᄏࡼᆮࢾቶLj
ၒ߲ᆬ݆࢟ኹጲૺၾზሰ።ăၒ߲ᆬ݆ဵᎅ᎖ࡀᏴၒ
߲࢟ྏᒦࡼ࢟ܤછĂ࢟ྏFTSࡼኹଢ଼ਜ਼FTMࡼኹଢ଼
ࡼăᎅၒ߲࢟ྏĂFTSĂFTMࡼၒ߲ᆬ݆࢟ኹଐ
Ⴏྙሆǖ
ၒྜྷ࢟ྏኡᐋ
ၒྜྷ࢟ྏᎌᓐ᎖ଢ଼ࢅᔈၒྜྷ࢟ኹࡼख़ᒋ࢟ഗLjି JD
ᒦࡼఎਈᐅဉăᔐၒྜྷ࢟ྏܘኍࢀ᎖ᑗࡍ᎖ጲሆࢀါ
߲ࡼᒋLjጲۣߒၒྜྷᆬ݆࢟ኹᏴᒎܪपᆍᒄดLj݀༦
ဧनౣᒗၒྜྷ࢟Ꮞࡼຫᆬ݆࢟ഗᔢቃǖ
CIN _ MIN =
VRIPPLE = VRIPPLE(C) + VRIPPLE(ESR) + VRIPPLE(ESL)
ᒦLjᎅၒ߲࢟ྏĂFTSĂFTMࡼᆬ݆࢟ኹॊܰྙሆǖ
IP−P
VRIPPLE(C) =
8 x COUT x fS
VRIPPLE(ESR) = IP−P x ESR
I
VRIPPLE(ESL) = P−P x ESL
t ON
࢟ঢᆬ݆࢟ഗख़.ख़ᒋ)JQ.Q*ଐႯྙሆǖ
V − VOUT VOUT
x
IP −P = IN
VIN
fS x L
ဧጲࢀါኡᐋ߱ဪ࢟ྏᒋăᔢઁࡼ࢟ྏᒋᄰਭዹ
૦ᑗຶৰހࡼۇ၂ࢾăᄰޟLj࢟ഗࡼᆬ݆ᏗቃLjၒ
߲࢟ኹࡼᆬ݆Ꮧቃăᎅ᎖࢟ঢᒋဵࢾ࢟ঢᆬ݆࢟ഗࡼ
ፐႤᒄጙLjჅጲݧ୷ࡍࡼ࢟ঢᒋဧၒ߲࢟ኹᆬ݆ି
ቃăᏴᓞધఎਈຫൈሆLjဧჿࠣ࢟ྏถࡻ୷ࢅࡼ
FTSਜ਼FTMăݧჿࠣ࢟ྏဟLj୷ࢅࡼFTSਜ਼FTM
ࡼᆬ݆࢟ኹభጲݙଐă
ঌᏲࡼၾზሰ።ጞ౷᎖Ⴥኡᐋࡼၒ߲࢟ྏăᏴঌᏲၾܤ
໐ମLjၒ߲ࡼၾဟܤછᆐ FTS y J MPBEăᏴ఼ᒜᔫ߲
ሰ።ᒄ༄Ljၒ߲ᇙތጙݛ౫ࡍLjᄏၫᒋན᎖࢟ঢ
ਜ਼ၒ߲࢟ྏᒋăႲઁLj఼ᒜၒ߲࢟ኹࢯஂࡵᎾ໐
ᒋă఼ᒜࡼሰ።ဟମན᎖ܕણࡒăࡒᏗࡍᐌሰ
።ဟମᏗLjܜၒ߲࢟ኹਭࣶມಭᆮࢾᒋăሮᇼቧ
ᇦݬఠޡݗଐݝॊă
D x TS x IOUT
VIN _ RIPPLE
ᒦLjWJO`SJQQMF ဵᄰਭၒྜྷ࢟ྏჅᏤࡼᔢࡍၒྜྷᆬ݆
࢟ኹLjፇকᒋࢅ᎖ᔢቃၒྜྷ࢟ኹࡼ 3&ăE ဵᐴహ܈
)WPVU 0! WJO*LjUT ᆐ2! 0! gT )ఎਈຫൈ*ă
Ᏼఎਈຫൈሆၒྜྷ࢟ྏࡼᔜఝ።কቃ᎖ၒྜྷ࢟Ꮞࡼᔜఝă
ᑚዹLjຫఎਈ࢟ഗ્ݙᄰਭၒྜྷᏎLjऎဵᎅၒྜྷ࢟ྏ
വă࢟ᏎᔜఝᏗࡍᐌገཇၒྜྷ࢟ྏᏗࡍăၒྜྷ࢟ྏܘ
ኍߌ၊ఎਈ࢟ഗࡼᆬ݆࢟ഗăሆါ߲೫SNTၒྜྷᆬ
݆࢟ഗǖ
IRIPPLE =
ILOAD x
VOUT x (VIN − VOUT )
VIN
ᒦJSJQQMF ဵၒྜྷSNTᆬ݆࢟ഗă
ޡݗଐ
࢟Ꮞࠅၫᎅၷ࢛ਜ਼ጙৈഃ࢛ᔝ߅ăၷ࢛ᎅၒ߲
݆࢟ঢMਜ਼ၒ߲݆࢟ྏDP ޘညăၒ߲݆࢟ྏࡼFTS
ࢾ೫ഃ࢛ăၷ࢛ਜ਼ഃ࢛ࡼຫൈᎅሆါ߲ǖ
fP1_ LC = fP2 _ LC =
1
R + ESR
)
2π x L x C O x ( O
RO + RL
fZ _ ESR =
1
2π x ESR x CO
ᒦ S M ࢀ᎖ၒ߲࢟ঢࡼ EDS ਜ਼ดݝఎਈ࢟ᔜ S ET)PO* ᒄ
ਜ਼ăSP ᆐၒ߲ঌᏲ࢟ᔜLjࢀ᎖ऄࢾၒ߲࢟ኹ߹ጲऄࢾၒ
߲࢟ഗăFTSᆐၒ߲݆࢟ྏࡼᔐࢀࠈೊ࢟ᔜăྙਫᎌ
ࣶৈሤᄴቯࡼၒ߲࢟ྏ݀ೊLjᏴါᒦࡼFTSࢀ᎖ৈ
ၒ߲࢟ྏࡼFTSᒋ߹ጲᔐࡼၒ߲࢟ྏৈၫă
______________________________________________________________________________________
13
NBY9765
ၒ߲࢟ྏኡᐋ
NBY9765
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
NBY9765 ࡼఎਈຫൈᏤဧჿࠣၒ߲࢟ྏăᎅ᎖ჿ
ࠣ࢟ྏࡼFTSሤࡩࢅLjሤ።ࠅၫഃ࢛ࡼຫൈገ᎖
ᆡᐐፄຫൈgDLjऎ༦ᑚৈഃ࢛ݙถޡݗᎅၒ߲݆࢟ঢਜ਼
ၒ߲࢟ྏޘညࡼၷ࢛ăၷ࢛ᐆ߅೫51eC0လ۶ຫ߈ࡼ
ᐐፄၱିਜ਼ 291°0လ۶ຫ߈ࡼሤጤăᇙތहࡍܘኍޡݗ
কᐐፄၱିਜ਼ሤጤLjጲࡻᆮࢾࡼࡒܕણᇹᄻăፐࠥLj
ဧᅄ4ᒦࡼƱቯޡݗऱါăƱቯޡݗऱါ፱ᎌྯৈ࢛Lj
ೝৈഃ࢛Ljᒦጙৈ࢛gQ2`FBLjࠀ᎖ഃຫൈ)ᒇഗ*ă
Ʊቯޡݗऱါ࢛ਜ਼ഃ࢛ࡼᆡᒙᎅሆါ߲ǖ
L
VOUT
LX
COUT
MAX8654
R3
R2
C3
FB
C1
R1
COMP
1
2π x R1 x C1
1
fZ2 _ EA =
2π x R3 x C3
fZ1_ EA =
1
fP3 _ EA =
2π x R1 x C2
1
fP2 _ EA =
2π x R2 x C3
ጲࢀါ᎖D2??D3ਜ਼S4??S3ࡼଣLjকଣᏴࡍࣶၫ
༽ౚሆ࣒ဵᑵཀྵࡼăᑚቋ࢛ਜ਼ഃ࢛ࡼᆡᒙᎅ࢟Ꮞࠅ
ၫࡼၷ࢛ਜ਼FTSഃ࢛ࡼຫൈࢾăጐဵჅᇧᆃࡼܕ
ણࡒࡼၫăጲሆดྏগၤ೫ଐႯNBY9765ޡݗᏄୈ
ࡼሮᇼਭ߈ă
࠭ࢾ໐ᆃࡼၒ߲࢟ኹఎဪăၒ߲࢟ኹᎅၒ߲ࡵ HOE ᒄ
ମࡼ࢟ᔜॊኹࢾLjᒦ࢟ᔜॊኹࡼᒦቦߥᄿೌ
ᒗGC )ྙᅄ4ᒦࡼS4ਜ਼S5*ăS5ࡼଐႯྙሆǖ
0.6 × R3
R4 =
VOUT − 0.6
ܕણᐐፄਭഃຫൈgD ።কቃ᎖ఎਈຫൈgT ࡼ31&ăᏗࡼ
ਭഃຫൈ્ࡻࡵᏗࡼၾზሰ።ăጙۅፇܕણࡼਭ
ഃຫൈ።কᏴఎਈຫൈࡼ 21&ࡵ 31&ᒄମăጙࡡኡࢾ g DLj
ᐌD2োጲሆࢀါଐႯǖ
1.5625 x VIN
C1 =
R
2 x π x R3 x (1 + L ) × fC
RO
14
R4
C2
ᅄ4/! Ʊቯޡݗᆀ
ᎅ᎖ၒ߲MDၷ࢛ࡼ་ᔜปᄂቶLj።ࢾƱቯޡݗऱါ
ࡼೝৈഃ࢛ຫൈቃ᎖MDၷ࢛ຫൈLjጲܣᄋߠᔗࡼሤ
ᆡᄋဍăࢾೝৈഃ࢛ࡼຫൈᆐ MD ၷ࢛ຫൈࡼ 91&ă
భጲࡻࡵǖ
R1 =
C3 =
L x CO x (RO + ESR)
1
x
0.8 x C1
RL + RO
L x CO x (RO + ESR)
1
x
0.8 x R3
RL + RO
औৈ࢛ޡݗgQ3`FB ᒙࡵg[`FTSLjభࡻࡵǖ
R2 =
CO x ESR
C3
ྯৈ࢛ޡݗᒙࡵఎਈຫൈࠀLjଐႯD3ྙሆǖ
1
C2 =
π × R1 × fS × 2
ࡩਭഃຫൈᏐᏐ᎖ၷ࢛ຫൈဟLjጲऱ߈భᄋற
ཀྵࡼޡݗăࡩਭഃຫൈத႒ࢀ᎖ၷ࢛ຫൈဟLjဣଔࡼ
ਭഃຫൈገ᎖ଐႯຫൈăᑚᒬ༽ౚሆLjଢ଼ࢅ S2 ࡼᒋ
ଢ଼ࢅਭഃຫൈăᄴဟLjྙਫਭഃຫൈ᎖ 311lI{LjƱ
ቯޡݗऱါࡼྯৈ࢛ᒙࡵఎਈຫൈএதLjጲᄋ
______________________________________________________________________________________
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
QDCݚᓖፀူሲਜ਼ེቶถ
5*! ॊܰJOĂMYਜ਼QHOEೌᒗࡍෂ૩ࡼ१ᄵཌLjጲۑ
ᓐJDྲེLjጙݛᄋൈਜ਼ޠ໐భణቶă
ᇼᒘࡼQDCݚሣ࣪ࡻࢅᐅĂᆮࢾࡼᔫᓨზႁᒗਈᒮ
ገăፇݬᑍNBY9765ຶৰݚࡼۇLjጲࡻᔢଛቶถă
ྙਫኊገখࣅLj༿ᔥክጲሆਖᐌጲࡻᔢଛࡼQDCݚǖ
6*! ཀྵۣჅᎌनౣೌሣऎᒇăनౣ࢟ᔜਜ਼ޡݗᏄୈ
हᒙᏴభถణதJDࡼᆡᒙă
2*! ၒྜྷ࢟ྏਜ਼ၒ߲࢟ྏLjWWQ ਜ਼WWEM ࡼ࢟ྏೌᒗ
ൈށǗჇჅᎌ࢟ྏೌᒗቧށă
7*! Ⴅఎਈஂ࢛ࡼݚሣLjྙMYLj።Ꮠಭැঢࡼෝผቧ
ཌ)GCĂDPNQ*ă
3*! ᎧWWQĂWJOĂWWMĂWWEM ਜ਼TTሤೌࡼ࢟ྏభถణ
தJDहᒙLj݀ဧᎧ࣪።୭ᒇೌăಭൈ
)ށᒗQHOE*ਜ਼ቧ)ށᒗHOE*ă
OPEN-LOOP
GAIN
COMPENSATION
TRANSFER
FUNCTION
THIRD
POLE
GAIN (dB)
DOUBLE POLE
SECOND
POLE
POWER-STAGE
TRANSFER FUNCTION
ESR
ZERO
FIRST AND
SECOND ZEROS
f
ᅄ5/! Ʊቯޡݗऱါࡼࠅၒၫ
______________________________________________________________________________________
15
NBY9765
4*! ࡍ࢟ഗࡼവభถۣߒ༦ăჁఎਈ࢟ഗ
വLj݀భถჁቃᎅMYĂၒ߲࢟ྏਜ਼ၒྜྷ࢟ྏᔝ߅
ࡼણവă
ሤᆡᎽăᓖፀLjభးࡩࢯᑳS5ጲۣᑺᎌޡݗăS4ࡼ
ፇपᆍᆐ3lΩࡵ21lΩă
``````````````````````````````` ୭ᒙ
``````````````````````````````` በຢቧᇦ
LX
LX
LX
LX
LX
LX
BST
SYNC
SYNCOUT
27
24
19
PROCESS: BiCMOS
20
21
22
23
25
26
TOP VIEW
LX
LX
N.C.
28
18
PWRGD
29
17
FB
30
16
EN
GND
31
15
COMP
SS
REFIN
32
14
MAX8654
36
10
VL
ྙኊᔢதࡼॖᓤᅪተቧᇦਜ਼ݚLj༿އኯ
china.maxim-ic.com/packagesă
ॖᓤಢቯ
ॖᓤܠ൩
ᆪܠ
36 TQFN
T3666-3
21-0141
9
8
7
13
``````````````````````````````` ॖᓤቧᇦ
IN
IN
VP
PGND
VDL
IN
IN
6
11
PGND
5
35
GND
FREQ
ILIM
4
12
3
34
2
33
1
N.C.
PGND
PGND
PGND
PGND
NBY9765
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
THIN QFN
16
______________________________________________________________________________________
23WĂ9BĂ2/3NI{ଢ଼ኹቯࢯஂ
ኀࢿ
ኀࢿ྇໐
0
8/06
ᔢ߱۾ۈă
1
4/08
ৎቤ೫ࢾ৪ቧᇦĂ୭ႁීਜ਼ॖᓤቧᇦݝॊă
2
7/09
ৎቤ೫࢟ഗሢᒜਜ਼ၒྜྷ࢟ྏኡᐋݝॊă
ႁී
ኀখ
—
1, 8, 14, 16
11, 13
Nbyjn ۱யࠀူێ
۱ய 9439ቧረ ᎆᑶܠ൩ 211194
ॅ࢟જǖ911!921!1421
࢟જǖ121.7322 62::
ࠅᑞǖ121.7322 63::
Nbyjn࣪ݙNbyjnޘອጲᅪࡼྀੜ࢟വဧঌᐊLjጐݙᄋᓜಽభăNbyjnۣഔᏴྀੜဟମĂᎌྀੜᄰۨࡼ༄ᄋሆኀখޘອᓾ೯ਜ਼ਖৃࡼཚಽă
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© 2009 Maxim Integrated Products
Nbyjn ဵ Nbyjn!Joufhsbufe!Qspevdut-!Jod/ ࡼᓖݿܪă
NBY9765
`````````````````````````````````````````````````````````````````````````` ኀࢿ಼ဥ