FS8S0765RCBTU FAIRCHILD [Fairchild Semiconductor], FS8S0765RCBTU Datasheet

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FS8S0765RCBTU

Manufacturer Part Number
FS8S0765RCBTU
Description
Fairchild Power Switch(FPS)
Manufacturer
FAIRCHILD [Fairchild Semiconductor]
Datasheet
Features
• Burst Mode Operation to Reduce the Power Consumption
• 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
Internal Block Diagram
©2003 Fairchild Semiconductor Corporation
FS8S0765RCB
Fairchild Power Switch(FPS)
in the Standby Mode
Soft start
& Sync
FB
5
4
Vref
Vcc
Vovp
Burst Mode Detector
V
I
Vcc
delay
SD
TSD
Vfb<0.8V
Vss>3V
No sync
Vref
Detector
I
FB
Sync
Burst Mode
Controller
2.5R
R
Vref
UVLO Reset
(Vcc<9V)
Vcc
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 tem-
perature protection. Compared with discrete MOSFET and
PWM controller solution, FPS can reduce total cost, compo-
nent count, size and weight simultaneously increasing effi-
ciency, productivity and system reliability. This device is well
suited for the cost effective monitor power supply.
3
1. Drain 2. GND 3. V
PWM
9V/15V
OSC
LEB
S
R
S
R
Q
Q
Q
Q
1
AOCP
Vcc good
TO-220-5L
CC
4. Feedback 5. Sync
Internal
driver
www.fairchildsemi.com
Gate
Vref
Bias
Vocl
Drain
1
2
GND
Rev.1.0.1

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FS8S0765RCBTU Summary of contents

Page 1

FS8S0765RCB Fairchild Power Switch(FPS) Features • 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) • ...

Page 2

FS8S0765RCB Pin Definitions Pin Number Pin Name 1 Drain 2 GND 3 Vcc 4 Feedback Soft Start & 5 Sync 2 Pin Function Description High voltage power SenseFET drain connection. This pin is designed to drive the transformer directly. This ...

Page 3

Absolute Maximum Ratings (Ta=25 C, unless otherwise specified) Parameter Drain-Gate Voltage (R = Gate-Source (GND) Voltage (2) Drain Current Pulsed Single Pulsed Avalanche Energy Single Pulsed Avalanche Current Continuous Drain Current (Tc = 25°C) Continuous Drain Current (T ...

Page 4

FS8S0765RCB Electrical Characteristics (SenseFET part) (Ta=25 C unless otherwise specified) Parameter Drain Source Breakdown Voltage Zero Gate Voltage Drain Current Static Drain Source On Resistance Forward Transconductance Input Capacitance Output Capacitance Reverse Transfer Capacitance Turn On Delay Time Rise Time ...

Page 5

Electrical Characteristics (Ta=25 C unless otherwise specified) Parameter UVLO SECTION Start Threshold Voltage Stop Threshold Voltage OSCILLATOR SECTION Initial Frequency Voltage Stability Temperature Stability (1) Maximum Duty Cycle Minimum Duty Cycle FEEDBACK SECTION Feedback Source Current Feedback Sink Current Shutdown ...

Page 6

FS8S0765RCB Electrical Characteristics Parameter BURST MODESECTION(DPMS MODE) Burst Mode High Threshold Voltage Burst Mode Low Threshold Voltage Burst Mode Enable FB Voltage Burst Mode Enable S_S Voltage Burst Mode Enable Delay Time Burst Mode Frequency CURRENT LIMIT(SELF-PROTECTION)SECTION Peak Current Limit(1) ...

Page 7

Typical Performance Characteristics (These characteristic graphs are normalized at Ta Start Up Current VS Temp. 1.20 1.15 1.10 1.05 1.00 0.95 0.90 0.85 0.80 -40 - Temperature[ ] Figure 1. Start Up Current vs. ...

Page 8

FS8S0765RCB Typical Performance Characteristics (These characteristic graphs are normalized at Ta Feedback Offset Voltage VS Temp. 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 -40 - Temperature[ ] Figure ...

Page 9

Typical Performance Characteristics (These characteristic graphs are normalized at Ta Normal Mode Regulation Voltage VS Temp. 1.20 1.15 1.10 1.05 1.00 0.95 0.90 0.85 0.80 -40 - Temperature[ ] Figure 13. Normal Mode Regulation ...

Page 10

FS8S0765RCB Typical Performance Characteristics (These characteristic graphs are normalized at Ta Burst Mode Peak Current VS Temp. 1.20 1.15 1.10 1.05 1.00 0.95 0.90 0.85 0.80 -40 - Temperature[ ] Figure 19. Burst Mode ...

Page 11

FS8S0765RCB Functional Description Start guarantee stable operation of the control IC, FS8S0765RCB has UVLO circuit with 6V hysteresis band. Figure 1 shows the relation between the sup- ply current (Icc) and the supply ...

Page 12

Over Load Protection (OLP) : When the load current exceeds a pre-set level for longer than pre-determined time, protection circuit should be activated in order to protect the SMPS. Because of the pulse-by-pulse current limit capability, the maximum peak ...

Page 13

The internal sync comparator detects the sync signal and determines the SenseFET turn-on time. The SenseFET is turned on at the negative edge of the sync comparator output. The reference voltage of the sync com- parator is ...

Page 14

Typical application circuit 1. 80W Universal Input Power Supply For CRT Monitor BD101 C106 220uF/400V 0 RT101 C105 100nF Line Filter: LF101 + C110 C103 C104 1uF/50V C108 22uF/50V 4.7nF 4.7nF C114 C102 100nF 1nF R104 2.2K ...

Page 15

Specification No Pin (s f) Np1 4 1 Insulation: Polyester Tape t = 0.050mm, 2Layers Nvo1 16 15 Insulation: Polyester Tape t = 0.050mm, 2Layers Nreg 7 8 Insulation: Polyester Tape t = 0.050mm, 2Layers Nvo2 14 13 Insulation: ...

Page 16

Circuit Part List Part Value Fuse F101 3A/250V NTC RT101 10D-9 Resistor R101 56K R102 3.3 R103 600K R104 2.2K R105 0.56K R106 0.1K R201 0.1K R202 4K R203 0.7K Inductor L201 ~ L205 13uH Capacitor C101 471D10 C102 ...

Page 17

FS8S0765RCB Package Dimensions 17 TO-220-5L ...

Page 18

Package Dimensions (Continued) TO-220-5L(Forming) FS8S0765RCB 18 ...

Page 19

... FS8S0765RCB Ordering Information Product Number FS8S0765RCBTU FS8S0765RCBYDTU TO-220-5L(Forming Non Forming Type YDTU : Forming Type 19 Package Marking Code TO-220-5L 8S0765RCB BVdss Rds(on)Max. 650V 1.6 ...

Page 20

FS8S0765RCB DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR ...

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