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PDF FAN3506 Data sheet ( Hoja de datos )
| Número de pieza | FAN3506 | |
| Descripción | PC SMPS Secondary Side Control IC | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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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
PT1
13
14
PT2
R1 R3 R5
R2 R4 R6
VCC
+
+
+
+
+_
1.26V
S
Q
R
Q1
VCC
PSON
7
lil VCC
+
_
3.2V COMP2
1.4V
VCC
VCC
lon VCC
_
+
COMP3
VCC
1.26V
+
_
loff
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
1.32V~1.26V
IK
15
16
VREF
8
TPSON
6 11 12
Rd PGI GND
10
TPG
©2002 Fairchild Semiconductor Corporation
Rev. 1.0.2
1 page  
Block Description & Application Hints
1. OVP Block
PT1 13
PT2 14
V33 V5 V12
1 23
R1 R3 R5
VCC
+
+
+ SET of Latch
+
R2 R4 R6
_+ COMP1
1.26V
FAN3506
OVP function is simply realized by connecting Pin1, Pin2, Pin3 to each secondary output. R1,2,3,4,5,6 are internal resistors of
the IC. Each OVP level is determined by resistor ratio and the typical values are 4V/6.1V/14.2V.
- OVP Detecting voltage for +3.3V
. Vovp33 = (R1+R2)/R2 * 1.26V = 4.1V(Typ)
- OVP Detecting voltage for +5V
. Vovp5 = (R3+R4)/R4 * 1.26V = 6.1V(Typ)
- OVP Detecting voltage for +12V
. Vovp12 = (R5+R6)/R6 * 1.26V = 14.3V(Typ)
Especially, Pin13 & Pin14 are prepared for extra OVP inputs or another protection signal, respectively. That is, if you want
over voltage protection of extra output voltage, then you can make a function with two external resistors.
- Threshold Voltage of Protection Input 1 : Vpt1 = 1.26V
- Threshold Voltage of Protection Input 2 : Vpt1 = 1.26V
OVP function operates without delay time. In the case of OVP, system designer should know a fact that the main power can be
dropped after a little time because of system delay, even if FPO is triggered by OVP.
So when the OVP level is tested with a set, you should check the secondary outputs(+3.3V/+5V/+12V) and FPO(Pin5)
simultaneously. you can know the each OVP level as checking each output voltage in just time that FPO is triggered from low
to high.
5
5 Page 
Typical Performance Characteristics (Continued)
FAN3506
Figure 7. OVP Detecting Voltage for 12V
Figure 8. Protection Input Voltage 1,2
Figure 9. PSON Input Threshold Voltage
Figure 10. High/Low Threshold of On/Off Delay
Figure 11. FPO Saturation Voltage
Figure 12. PGI Threshold Voltage
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet FAN3506.PDF ] | |
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