FAN3506 Datasheet, PDF (1/16 Pages) Fairchild Semiconductor – PC SMPS Secondary Side Control IC

FAN3506
PC SMPS Secondary Side Control IC
www.fairchildsemi.com
Features
• Few External Components
• Low Voltage Operation (Vcc_min=4.5V)
• Over Voltage Protection for 3.3V/5V/12V Output
• Two Protection Inputs (PT1, PT2)
• Fault Protection Output with Open Collector
• Power Supply on/off Delay Time Control (PSON)
• Latch Function Controlled by PSON and Protection
• Power Good Signal Generator with Hysteresis
• 300ms(Typ) Power Good Delay
• Programmable Shunt Regulator Trimmed to ±2%
• 16-Pin Dual In-line Package (16-DIP-300)
Description
The FAN3506 is complete housekeeping circuitry for use in
the secondary side of PC SMPS (Switched Mode Power
Supply). It contains various functions, which are over
voltage protection including two extra protection inputs,
power supply on/off delay control and power good signal
generator. Especially, it contains a programmable shunt
regulator for output feedback and the reference voltage is
trimmed to ±2%. The FAN3506 is available in 16-DIP.
16-DIP
Block Diagram
V33 V5 V12
12 3
1
FPO
5
VCC
4
R1 R3 R5
VCC
PT1
13
14
+
+
+
+
+_
S
PT2
Q
R2 R4 R6 _1.26V
R
Q1
VCC
PSON
7
lil _VCC
+
_
3.2V ^COMP2
1.4V
VCC
VCC
lon ^VCC
VCC
loff
_
+
COMP3
1.26V
+
_
1.8V~0.6V
R7 R9 R11 ^VCC
_
_
_
+
R8 ^R10 R12 COMP4
3.9V
1.32V~1.26V
lchg
_
Q3
+
COMP6
1.8V~1.2V
Q2
PG
9
_
+
COMP5
IK
15
1.32V~1.26V
16
VREF
8
TPSON
6
11
12
Rd
PGI
GND
10
TPG
©2002 Fairchild Semiconductor Corporation
Rev. 1.0.2