LTC3705_15 Datasheet, PDF (7/20 Pages) Linear Technology – 2-Switch Forward Controller and Gate Driver

BLOCK DIAGRA
LTC3705
NDRV 6
0.6V
I_NDRV
+ 8V
–
+
–
7.4V/7V
LINEAR
–
REGULATOR
TRICKLE
CHARGE
13.4V/7V
TRICKLE
CHARGER
+
SHUNT REGULATOR
V_CC
+
UVGD
5V
REGULATOR
14.25V –
0.27mA
+
–_V
SSFLT 5
UVLO 4
1.242V
1.226V
V_FF
0.66
+
–
4.9µA
UVVIN
GND 1
IN⁺
CONDITION IN^–
PWM
RECEIVER
SW
DET
LINE OFF
TIME
SOFT-START
FAULT
5.3V/4.7V +
–
UVINT
OC
13 NC
12 NC
2 IS
300mV
PWM SECONDARY CONTROL
5V
+
LEVEL
SHIFT
SW
DET
DRIVE
LOGIC
BOOTSTRAP
REFRESH
14 BOOT
15 TG
16 TS
FB/IN⁺ 7
FS/IN^– 8
PRIMARY
SIDE CONTROL
N/C
400mV
–
PWM
PRIMARY
CONTROL
FREQUENCY
2V
SET
RAMP
V_P-P
V_{P-P OSCILLATOR CLOCK}
0V
OPTO
BIAS
I_OSC
SECONDARY SIDE CONTROL
3.3V
V_CC
RECTIFIER
PGND
1.25V
3 VSLMT
SWITCHES
ON
11 V_CC
10 BG
9 PGND
3705 BD
3705fb
7