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Part: FS8S0765RCB
Category:
Power Management
-> Power Distribution/Switches
Description: 7A/650V Snychronized Power Switch, Primary Side Regulation
Company: Fairchild Semiconductor
Datasheet: Download FS8S0765RCB datasheet File size : 171 kB
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FS8S0765RCB
Features
Fairchild Power Switch(FPS)
Description
FS8S0765RCB is a Fairchild Power Switch (FPS) that is specially designed for off-line SMPS of CRT monitor with minimal external components. This device is a current mode PWM controller combined with a high voltage power SenseFET in a single package. The PWM controller features integrated oscillator to be synchronized with the external sync signal, under voltage lockout, optimized gate driver and temperature compensated precise current sources for the loop compensation. This device also includes various fault protection circuits such as over voltage protection, over load protection, abnormal over current protection and over temperature protection. Compared with discrete MOSFET and PWM controller solution, FPS can reduce total cost, component count, size and weight simultaneously increasing efficiency, productivity and system reliability. This device is well suited for the cost effective monitor power supply.
TO-220-5L
· Burst Mode Operation to Reduce the Power Consumption in the Standby Mode · External pin for Synchronization and Soft Start · Wide Operating Frequency Range up to 150kHz · Low Start-up Current (Max:80uA) · Low Operating Current (Max:15mA) · Pulse by Pulse Current Limiting · Over Voltage Protection (Auto Restart Mode) · Over Load Protection (Auto Restart Mode) · Abnormal Over Current Protection (Auto Restart Mode) · Internal Thermal Shutdown (Auto Restart Mode) · Under Voltage Lockout · Internal High Voltage SenseFET
Application
· Monitor SMPS
1
1. Drain 2. GND 3. VCC 4. Feedback 5. Sync
Internal Block Diagram
V r ef
Vcc 3 Vcc good
Dra in 1
So ft start 5 & Sync
B u r st Mode Detector V f b 3V No sync
Vref
B u rst Mode C o n t r o ll e r
9 V/1 5V
S yn c D etecto r
V r ef OSC
In terna l B ias
Vcc I d e la y
V re f IFB
PWM 2 .5 R R
S
Q
FB
4
R
Q
G ate drive r
LEB
V SD V cc V ov p T SD
U V L O Reset (V cc <9 V )
S R Q
2 G ND
Q
A O CP
V ocl
Rev.1.0.1
©2003 Fairchild Semiconductor Corporation
FS8S0765RCB
Pin Definitions
Pin Number 1 2 3 Pin Name Drain G ND Vc c Pin Function Description High voltage power SenseFET drain connection. This pin is designed to drive the transformer directly. This pin is the control ground and the SenseFET source. This pin is the positive supply input. This pin provides internal operating current for both start-up and steady-state operation. This pin is internally connected to the inverting input of the PWM comparator. For stable operation, a capacitor should be placed between this pin and GND. If the voltage of this pin reaches 7.5V, the over load protection is activated resulting in shutdown of FPS. This pin is for soft start and synchronization to the external sync signal.
4
Feedback Soft Start & Sync
5
2
FS8S0765RCB
Absolute Maximum Ratings
(Ta=25°C, unless otherwise specified) Parameter Drain-Gate Voltage (RGS=1M) Gate-Source (GND) Voltage Drain Current Pulsed
(2) (3)
Symbol VDGR VGS ID M EA S IA S ID ID VCC VF B VS_S PD(Watt H/S) Derating Tj TA TSTG
Value 650 ±30 28 370 17 7 4.5 35 -0.3 to Vcc -0.3 to 10 145 1.16 +150 -25 to +85 -55 to +150
Unit V V ADC mJ A ADC ADC V V V W W/°C °C °C °C
Single Pulsed Avalanche Energy
Single Pulsed Avalanche Current (4) Continuous Drain Current (Tc = 25°C) Continuous Drain Current (TC=100°C) Supply Voltage Input Voltage Range Total Power Dissipation Operating Junction Temperature Operating Ambient Temperature Storage Temperature Range
Notes: 1. Tj=25°C to 150°C 2. Repetitive rating: Pulse width limited by maximum junction temperature 3. L=14mH, starting Tj=25°C 4. L=13uH, starting Tj=25°C
3
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