Datasheet

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April 2007

FSQ211 Rev. 1.0.0

FSQ211 ⎯ Green Mode Fairchild Power Switch (FPS

)

FSQ211

Green Mode Fairchild Power Switch (FPS

)

Features

 Internal Avalanche-Rugged SenseFET

 Precision Fixed Operating Frequency (67KHz)

 Burst-Mode Operation

 Internal Start-up Circuit

 Pulse-by-Pulse Current Limiting

 Overload Protection (OLP)

 Internal Thermal Shutdown Function (TSD)

 Auto-Restart Mode

 Under-Voltage Lockout (UVLO) with Hysteresis

 Built-in Soft-Start

 Secondary-Side Regulation

Applications

 Charger & Adapter for Mobile Phone, PDA, & MP3

 Auxiliary Power for White Goods, PC, C-TV, &

Monitor

Related Application Notes

 AN-4137 Design Guidelines for Off-line Flyback

Converters using FPS™

 AN-4141 Troubleshooting and Design Tips for

Fairchild Power Switch (FPS™) Flyback Applications

 AN-4147 Design Guidelines for RCD Snubber of

Flyback

 AN-4134Design Guidelines for Off-line Forward

Converters using FPS™

 AN-4138Design Considerations for Battery Charger

Using Green Mode Fairchild Power Switch (FPS™)

Description

The FSQ211 consists of an integrated Pulse Width

Modulator (PWM) and SenseFET, specifically designed

for high-performance, off-line Switch Mode Power

Supplies (SMPS) with minimal external components.

This device is an integrated high-voltage power

switching regulator that combines a VDMOS SenseFET

with a voltage mode PWM control block. The integrated

PWM controller features include a fixed oscillator, Under

Voltage Lockout (UVLO) protection, Leading Edge

Blanking (LEB), an optimized gate turn-on/turn-off

driver, Thermal Shutdown (TSD) protection, and

temperature compensated precision-current sources for

loop compensation and fault protection circuitry.

When compared to a discrete MOSFET and controller or

RCC switching converter solution, the FSQ211 device

reduces total component count and design size and

weight, while increasing efficiency, productivity, and

system reliability. This device provides a basic platform

well suited for cost-effective flyback converters.

Ordering Information

Part Number Package Top Mark BV

DSS

OSC

DS(ON)

FSQ211 8DIP

Q211

650V 67KHz

18Ω

FSQ211L 8LSOP

Q211L

650V 67KHz

18Ω

FPS

is a trademark of Fairchild Semiconductor Corporation

Summary of content (13 pages)

PAGE 1
FSQ211 Green Mode Fairchild Power Switch (FPSTM) Features Description Internal Avalanche-Rugged SenseFET Precision Fixed Operating Frequency (67KHz) Burst-Mode Operation Internal Start-up Circuit Pulse-by-Pulse Current Limiting Overload Protection (OLP) Internal Thermal Shutdown Function (TSD) Auto-Restart Mode Under-Voltage Lockout (UVLO) with Hysteresis Built-in Soft-Start Secondary-Side Regulation The FSQ211 consists of an integrated Pulse Width Modulator (PWM) and SenseFET, spec
PAGE 2
AC IN DC OUT Vstr Drain PWM Vfb Figure 1. Vcc GND Typical Flyback Application Internal Block Diagram Figure 2. © 2007 Fairchild Semiconductor Corporation FSQ211 Rev. 1.0.0 FSQ211 ⎯ Green Mode Fairchild Power Switch (FPSTM) Typical Application Functional Block Diagram of FSQ211 www.fairchildsemi.
PAGE 3
GND 1 8 Drain Vcc 2 7 Drain Vfb 3 6 Drain NC 4 5 Vstr Figure 3. Pin Configuration (Top View) Pin Definitions Pin Name 1 GND Ground. SenseFET source terminal on primary side and internal control ground. VCC Positive supply voltage input. Although connected to an auxiliary transformer winding, current is supplied from pin 5 (Vstr) via an internal switch during startup (see Block Diagram).
PAGE 4
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. TA=25°C unless otherwise specified.
PAGE 5
TA=25°C unless otherwise specified, Symbol Parameter Conditions Min. Typ. Max. Unit SENSEFET SECTION IDSS RDS(ON) gfs VDS=650V, VGS=0V 25 Zero-Gate-Voltage Drain Current VDS=520V, VGS=0V, TC=125°C 200 Drain-Source On-State Resistance(6) VGS=10V, ID=0.2A Forward Trans-Conductance VDS=50V, ID=0.2A CISS Input Capacitance COSS Output Capacitance CRSS Reverse Transfer Capacitance 18 1.0 25 1.3 µA Ω S 162 VGS=0V, VDS=25V, pF 18 f=1MHz 3.
PAGE 6
1.15 1.15 1.10 1.10 1.05 1.05 1.00 1.00 IOP VREF These characteristic graphs are normalized at TA = 25°C. 0.95 0.95 0.90 0.90 0.85 -50 0 50 100 0.85 150 -50 0 Figure 5. 1.15 1.10 1.10 1.05 1.05 VSTOP VSTAART Reference Voltage (VREF) vs. TA 1.15 1.00 0.95 0.90 0.90 -50 0 50 100 0.85 150 Operating Supply Current (IOP) vs. TA -50 0 Temperature [°C] Start Threshold Voltage (VSTART) vs. TA Figure 7. 1.15 1.15 1.10 1.10 1.05 1.05 1.00 0.95 0.90 0.
PAGE 7
1.15 1.15 1.10 1.10 1.05 1.05 1.00 1.00 IFB ILIM These characteristic graphs are normalized at TA = 25°C. 0.95 0.95 0.90 0.90 0.85 0.85 -50 0 50 100 150 -50 0 Temperature [°C] 1.10 1.10 1.05 1.05 VSD IDELAY 1.15 1.00 1.00 0.95 0.95 0.90 0.90 0 50 100 0.85 150 Temperature [°C] -50 0 50 100 150 Temperature [°C] Figure 12. Shutdown Delay Current (IDELAY) vs. TA © 2007 Fairchild Semiconductor Corporation FSQ211 Rev. 1.0.0 150 Figure 11.
PAGE 8
1. Start-up: At start-up, the internal high-voltage current source supplies the internal bias and charges the external VCC capacitor, as shown in Figure 14. In the case of the FSQ211, when VCC reaches 9V, the device starts switching and the internal high-voltage current source stops charging the capacitor. The device is in normal operation provided VCC does not drop below 7V. After start-up, the bias is supplied from the auxiliary transformer winding.
PAGE 9
Drain current ILIM 2.14ms 7steps t Figure 19. Internal Soft-Start 6. Burst Operation: To minimize the power dissipation in standby mode, the FSQ211 enters burst mode operation. As the load decreases, the feedback voltage decreases. The device automatically enters burst mode when the feedback voltage drops below VBURL (0.55V). At this point, switching stops and the output voltages start to drop. This causes the feedback voltage to rise. Once is passes VBURH (0.70V), switching starts again.
PAGE 10
Methods of Reducing Audible Noise Switching mode power converters have electronic and magnetic components that generate audible noises when the operating frequency is in the range of 20~20,000Hz. Even though they operate above 20kHz, they can make noise depending on the load condition. Designers can employ several methods to reduce noise. Glue or Varnish The most common method involves using glue or varnish to tighten magnetic components.
PAGE 11
FSQ211 ⎯ Green Mode Fairchild Power Switch (FPSTM) Physical Dimensions Dimensions are in millimeters unless otherwise noted. Figure 24. 8-Lead Dual In-line Package (DIP) © 2007 Fairchild Semiconductor Corporation FSQ211 Rev. 1.0.0 www.fairchildsemi.
PAGE 12
FSQ211 ⎯ Green Mode Fairchild Power Switch (FPSTM) Physical Dimensions (Continued) Dimensions are in millimeters unless otherwise noted. Figure 25. 8-Lead LSOP © 2007 Fairchild Semiconductor Corporation FSQ211 Rev. 1.0.0 www.fairchildsemi.
PAGE 13
FSQ211 ⎯ Green Mode Fairchild Power Switch (FPSTM) © 2007 Fairchild Semiconductor Corporation FSQ211 Rev. 1.0.0 www.fairchildsemi.