FSQ500L FAIRCHILD | Alldatasheet

Document overview

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Technical content

Features

ƒ Single Chip 700V SenseFET Power Switch ƒ Precision Fixed Operating Frequency: 130kHz ƒ No-load consumption 250mW at 265V AC with Burst Mode and Down to 60mW with External Bias ƒ Internal Startup Switch ƒ Soft-Start Time Tuned by External Capacitor ƒ Under-Voltage Lockout (UVLO) with Hysteresis ƒ Pulse-by-Pulse Current Limit ƒ Overload Protection (OLP) and Internal Thermal Shutdown Function (TSD) with Hysteresis ƒ Auto-Restart Mode ƒ No Need for Auxiliary Bias Winding

Applications

ƒ Cost-Effective Linear Power Supplies Replacement ƒ Charger and Adapter for Mobile Phone, PDA, MP3, and Cordless Phone Related Application Notes ƒ AN-4137, AN-4141, AN-4147 (Flyback) ƒ AN-4138 (Charger)

Description

The FSQ500L is specially designed for a replacement of linear power supplies with low cost. This device combines current-mode Pulse Width Modulator (PWM) with a senseFET. The integrated PWM controller features include: a fixed oscillator, Under Voltage Lockout (UVLO) protection, Overload Protection (OLP), Leading-Edge Blanking (LEB), an optimized gate turn- on/turn-off driver, Thermal Shutdown (TSD) protection with hysteresis, and temperature-compensated precision-current sources for loop compensation. When compared to a linear power supply, the FSQ500L device reduces total size and weight, while increasing efficiency, productivity, and system reliability. This device provides a basic platform for cost-effective flyback converters. Maximum Output Power(1) 230Vac ± 15%(2) 85-265V AC Adapter(3) Open Frame(4) Adapter(3) Open Frame(4) 2.5W 3.0W 2.0W 2.5W Notes: 1. The junction temperature can limit the maximum output power. 2. 230V AC or 100/115VAC with doubler. 3. Typical continuous power in a non-ventilated enclosed adapter measured at 50°C ambient. 4. Maximum practical continuous power in an open frame design at 50°C ambient.

Ordering Information

Temperature Range Eco Status Package Packing Method FSQ500L -25°C to +85°C RoHS 4-Lead, Small Outline For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.

Figure 3. Package / Pin Diagram 1 GND This pin is the control ground and the senseFET source. current source supplies internal bias and char ges the external capacitor connected to the VCC pin. irregularly to maintain VCC at 6.5V.

3 V CC

4 V FB

© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ500L • Rev. 1.0.0 4 FSQ500L — Compact, Green Mode, Fairchild Power Switch (FPS™) Absolute Maximum Ratings The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric va lues defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table defines the conditions for actual device operation. Symbol Parameter Min. Max. Unit VDS Drain Pin Voltage (5) 700 V VCC Supply Voltage 10 V VFB Feedback Voltage Range -0.3 V CC V PD Total Power Dissipation 0.78 W IDM Drain Current Pulsed (6) 0.41 A TJ Operating Junction Temperature -25 +150 °C TSTG Storage Temperature -55 +150 °C Notes: 5. LDMOS available drain voltage is -0.3V ~ 700V. 6. Repetitive rating: pulse width is limited by maximum junction temperature. Thermal Impedance Symbol Parameter Value Unit θJA Junction-to-Ambient Thermal Resistance (7) +160 °C/W Note: 7. Free-standing with no heat sink; minimum land pattern.

© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ500L • Rev. 1.0.0 5 FSQ500L — Compact, Green Mode, Fairchild Power Switch (FPS™)

Electrical Characteristics

TJ = 25°C unless otherwise specified. Symbol Parameter Test Conditions Min. Typ. Max. Unit SenseFET Section BVDSS Drain-Source Breakdown Voltage VCC = 6.5V, VFB = 0V, ID = 150μA 700 V IDSS Zero-Gate-Voltage Drain Current V CC = 6.5V, VFB = 0V, VDS = 560V 150 μA TJ = 25°C, ID = 25mA 25 29 Ω RDS(ON) Drain-Source On-State Resistance TJ = 100°C, ID = 25mA 35 41 Ω CISS Input Capacitance(8) V GS = 6.5V 42 pF COSS Output Capacitance(8) V DS = 40V, fS = 1MHz 25 pF tr Rise Time(8) V DS = 350V, ID = 25mA 100 ns tf Fall Time(8) V DS = 350V, lD = 25mA 50 ns Control Section fS Switching Frequency V CC = 6.5V, VFB = 1.0V 120 130 140 kHz ΔfS Switching Frequency Variation(8) -25°C < TJ < 125°C ±5 ±7 % IFB(Burst) VCC = 6.5V, VFB = 0V 98 110 122 μA IFB(Normal) Feedback Source Current VCC = 6.5V 200 225 250 μA DMAX Maximum Duty Ratio V CC = 6.5V, VFB = 4.0V 54 60 66 % DMIN Minimum Duty Ratio V CC = 6.5V, VFB = 0V 0 % VSTART VFB = 0V, VCC Sweep 5.5 6.0 6.5 V VSTOP UVLO Threshold Voltage After Turn-on, VFB = 0V, VCC Sweep 4.5 5.0 5.5 V VDLY_EN Shutdown Delay Current Enable Voltage VFB = VSD, VCC Sweep from 6V 6.0 6.5 7.0 V Burst-Mode Section VBURH 0.75 0.80 0.85 V VBURL 0.70 0.75 0.80 V HYS Burst Mode Voltage V CC = 6.5V, VFB Sweep 30 50 80 mV Protection Section ILIM Peak Current Limit di/dt = 150mA/µs 245 280 315 mA VSD Shutdown Feedback Voltage V CC = 6.5V, VFB Sweep 4.1 4.5 4.9 V IDELAY Shutdown Delay Current V CC = 6.5V, VFB = 4.0V 4 5 6 μA tLEB Leading Edge Blanking Time(8) 250 ns tCLD Current Limit Delay Time(8) 100 ns TDS 130 140 150 °C HYS Thermal Shutdown Temperature(8) 80 °C Total Device Section IOP-BURST V CC = 6.5V, VFB = 0V 360 430 500 μA IOP-FB Operating Supply Current (Control Part Only) VCC = 6.5V, VFB = 4V 640 760 880 μA ICH Startup Charging Current V CC = VFB = 0V, VDS = 40V 3.3 mA VCCREG Supply Shunt Regulator V DS = 40V, VFB = 0V 6.0 6.5 7.0 V VCCREG_ TSD Supply Shunt Regulator During TSD(8) 5.2 5.7 6.2 V Note: 8. These parameters, although guaranteed, are not 100% tested in production.

  1. Startup and V CC Regulation : At startup, an internal

Figure 15. Startup Block

  1. Feedback Control : FSQ500L employs current mode

2.1 Pulse-by-Pulse Current Limit : Because current

through the senseFET is limited.

2.2 Leading-Edge Blanking (LEB) : At the instant the

FPS employs a leading-edge blanking (LEB) circuit. LEB = 250ns) after the senseFET turns on.

2 OSC

Figure 16. Pulse Width Modulation (PWM) Circuit

  1. Protection Circuits : The FSQ500L has two self-

eliminated, as shown in Figure 17. improved without increasing cost. Figure 17. Auto Restart Protection Waveforms

3.1 Overload Protection (OLP) : Overload is defined as

protection circuit should tri gger to protect the SMPS. whether the situation is tr ansient or a true overload. B from 2.7V to 4.5V with 5µA. Figure 18. Overload Protection

3.2 Thermal Shutdown (TSD): The senseFET and the

approximately 140 °C, the thermal shutdown triggers. Figure 19. Over-Temperature Protection (OTP)

  1. Soft-Start: The soft-start time is tuned by an external

the current consuming inside IC becomes I OP. makes the increasing slope of V CC become sluggish. of one of the input terminals of the PWM comparator. tS/S is around 4.6ms with 27µF of CA. Figure 20. Soft-Start Function stress on the secondary diode during startup.

  1. Burst Operation : To minimize power dissipation in

standby mode, the FPS enters burst-mode operation. senseFET, reducing switching loss in standby mode. Figure 21. Burst-Mode Operation

Figure 22. 4-Lead, Small Outline Package (SOT223-4L) the warranty therein, which covers Fairchild products.

© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ500L • Rev. 1.0.0 12 FSQ500L — Compact, Green Mode, Fairchild Power Switch (FPS™)