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FSBH0370 − 3A/700V 100kHz Power Switch
| Not recommended for new design as of 23-Aug-2011 |
The highly integrated FSBH-series consists of an integrated current-mode Pulse Width Modulator (PWM) and an avalanche-rugged 700V SenseFET. It is specifically designed for high-performance offline Switch Mode Power Supplies (SMPS) with minimal external components.
The integrated PWM controller features include a proprietary green-mode function that provides off-time modulation to linearly decrease the switching frequency at light-load conditions to minimize standby power consumption. To avoid acoustic-noise problems, the minimum PWM frequency is set above 18kHz. This green-mode function enables the power supply to meet international power conservation requirements. The PWM controller is manufactured using the BiCMOS process to further reduce power consumption. The FSBH-series turns off some internal circuits to improve power saving when VFB is lower than 1.6V, which allows an operating current of only 2.5mA.
The FSBH-series has built-in synchronized slope compensation to achieve stable peak-current-mode control. The proprietary external line compensation ensures constant output power limit over a wide AC input voltage range, from 90VAC to 264VAC.
The FSBH-series provides many protection functions. In addition to cycle-by-cycle current limiting, the internal open-loop protection circuit ensures safety when an open-loop or output short occurs. PWM output is disabled until VDD drops below the VTH-OLP, then the controller starts up again. As long as VDD exceeds 28V, the internal OVP circuit is triggered.
Compared with a discrete MOSFET and controller or RCC switching converter solution, the FSBH-series reduces total component count, design size, and weight; while increasing efficiency, productivity, and system reliability. These devices provide a basic platform that is well suited for design of cost-effective flyback converters, such as in PC auxiliary power supplies.
Product Status/Packaging
| Product | Product & Eco Status | Replacement Part Number | Packaging & Packing Info | **Package Marking Convention | Qualification Support | Compliance Certificates |
|---|---|---|---|---|---|---|
| FSBH0370NY |
Not recommended for new design as of 23-Aug-2011 Green as of Apr 2009 |
MDIP 8L Details RAIL |
Line 1:$Y (Fairchild logo) &Z (Plant Code) &2 (2-Digit Date Code) &K
Line 2:BH0370
Line 3:NYH |
ESD (CDM) :
1000
V ESD (HBM) : 3000 V RTHETA (JA) : 80 °C/W Show more... |
Features
- Brownout Protection with Hysteresis
- Built-In 5ms Soft-Start Function
- Internal Avalanche Rugged 700V SenseFET
- No Acoustic Noise During Light-Load Operation
- High-Voltage Startup
- Linearly Decreasing PWM Frequency to 18KHz
- Peak-Current-Mode Control
- Cycle-By-Cycle Current Limiting
- Leading-Edge Blanking (LEB)
- Synchronized Slope Compensation
- Internal Open-Loop Protection
- VDD Under-Voltage Lockout (UVLO)
- VDD Over-Voltage Protection (OVP)
- Internal Auto-Restart Circuit (OVP, OTP)
- Constant Power Limit (Full AC Input Range)
- Internal OTP Sensor with Hysteresis
- VIN Pin for Pull-HIGH Latch function and Pull-LOW Auto-Recovery Protection
Applications
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Application Notes
| Application Note | Description |
|---|---|
| AN-8024 | Applying Fairchild Power Switch (FPS™) FSBH-series to Standby Auxiliary Power Supply(494 K) 03-Mar-2011 |
Reference Designs
| Application | Document Number | Featured Products | Output Power |
Input Voltage |
Topology |
|---|---|---|---|---|---|
| ATX PC Power | RD-268 | FSBH0370 | 300W | 85-265VAC | CCM Boost PFC + Two SwitchForward + Flyback |
| PC Standby Power | RD-304 | FSBH0370 | 20W | 85-265VAC | Flyback Converter |
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