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LTC3725_15 Datasheet, PDF (7/20 Pages) Linear Technology – Single-Switch Forward Controller and Gate Driver | |||
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BLOCK DIAGRA
NDRV 3
0.6V
INDRV
+ 8V
â
+
â
0.27mA
+
âV
SSFLT 2
UVLO 1
1.242V
1.226V
VFF
0.66
+
â
4.9µA
LTC3725
7.4V/7V
LINEAR
â
REGULATOR
TRICKLE
CHARGE
13.4V/7V
TRICKLE
CHARGER
+
SHUNT REGULATOR
VCC
+
UVGD
5V
REGULATOR
14.25V â
LINE OFF
TIME
SOFT-START
FAULT
5.3V/4.7V +
â
UVINT
OC
10 IS
300mV
UVVIN
GND 11
(PAD)
FB/IN+ 4
FS/INâ 5
IN+
CONDITION INâ
PWM
RECEIVER
SW
DET
SW
PWM SECONDARY CONTROL
DET
5V
+
PRIMARY
SIDE CONTROL
N/C
400mV
â
PWM
PRIMARY
CONTROL
FREQUENCY
2V
SET
RAMP
VP-P
VP-P OSCILLATOR CLOCK
0V
OPTO
BIAS
IOSC
SECONDARY SIDE CONTROL
3.3V
VCC
RECTIFIER
PGND
DRIVE
LOGIC
1.26V
9 VSLMT
SWITCH
ON
8 VCC
7 GATE
6 PGND
3725 BD
3725fa
7
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