Fe FA7726, FA7730 Service Manual
45V Input Buck Converter 3ch/2ch IC with Power MOSFET
Features
Features
FA7726/7730
FA7726/7730
Features
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3ch-IC Brock Diagram and application example
33chch--IC Brock Diagram and application example
IC Brock Diagram and application example
RT
REG3
FB1
IN1-
VIN1
FB2
IN2-
VIN2
FB3
IN3-
VIN3
CS1
CS2
CS3
3V
Soft
Start
OSC
VREG3
1V
1V
1V
VREF
E.A.1
E.A.2
E.A.3
PW M
Comp.1
PW M
Comp.2
PW M
Comp.3
VREG5
UVLO
UVLO_L
UVLO_H
SRQ
Cu rrent
Limit
ch2
FB
SCP
REG5
VCC
PVCC1
OUT1
PGND1
PVCC2
OUT2
PGND2
PVCC3
OUT3
PGND3
ch3
CP
OHP
Vin = 10 to 45V
VO1(5V/1.2A)
VIN1 pin
VO2(3.3V/1.2A)
VIN2 pin
VO3(1.5V/1.2A）
VIN3 pin
5V
P
Dead Time
N
Curre nt Limit
UVLO
P
N
Current Limit
UVLO
*
P
Dead Time Dead Time
N
Current Limit
UVLO
ch1
ch2
ch3
ch1
Detection
OTP(OHP)
Item
Input Voltage Range
DC Output
Voltage / Current
1. Wide Input Voltage Range : 10 to 45V
2. 75 to 85% High Efficiency is achieved by
using internal power MOSFETs with
synchronized rectifier.
3. Low Operating Current : 3.5mA
4. Protection : Current Limit of power MOSFET,
Each channel soft start, Timer Latched
Protection for Short Current and Over
Temperature
Brief Specification
Brief Specification
Brief Specification
Characteristics
3ch FA7726F 2ch FA7730F
10 to 45V
5.0V/1.2A
3.3V/1.2A
1.5V/1.2A 3.3V/1.2A
5.0V,1.5V Selectable
1.2A Output
GND
Switching Frequency
Junction Temperature
40k to 200kHz
-20 to 150 degree
45V Input Buck Converter 3ch/2ch IC with Power MOSFET
FA7726/7730
FA7726/7730
DC-to-DC Converter Data
DC--toto--
DC
DC Converter Data
DC Converter Data
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DC/DC 3 Outputs Condition
FA7726 Efficiency
Input Voltage vs. Efficiency
90
85
80
75
Efficiency [%]
70
65
5V/1.2A
1.5V/0.8A
3.3V/0.8A
fosc=40kHz
fosc=60kHz
fosc=80kHz
fosc=100kHz
fosc=120kHz
fosc=140kHz
fosc=160kHz
fosc=180kHz
fosc=200kHz
60
5 10152025303540455055
DC input voltage [V]
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