LT4430_1 Datasheet, PDF (8/26 Pages) Linear Technology – Secondary-Side Opto-Coupler Driver Ground-Referenced Opto-Coupler Drive

LT4430
BLOCK DIAGRAM
1.1V
BIAS AND
V_IN
STARTUP
REFERENCE _0.6V
GENERATOR
V_IN
I1
12.5μA
Q2 Q3
+
COMP ^R3
15k
OPTO
DRIVER
OUT
+
–
ERROR
R4
AMP
90k
–
UVLO
FB
Q1
R1
2k
V_IN
I2
12.5μA
V_IN
I_OC
Q4
8.5μA
DFB
Q5
–+
V1
0.2V
R2
2k
Q6
S1
NORMALLY
OPEN
OC
Q7
LOGIC
AND
DELAY
GND
–+
V2
0.6V
OC
AMP
–+
V_OS
48mV
4430 BD01
4430fb
8