FSQ510, FSQ510H, and FSQ510M
Green Mode Fairchild Power Switch (FPS™) for Valley Switching
Converter – Low EMI and High Efficiency
Features
- Uses an LDMOS Integrated Power Switch
- Optimized for Valley Switching Converter (VSC)
- Low EMI through Variable Frequency Control and Inherent Frequency
Modulation
- High Efficiency through Minimum Drain Voltage Switching
- Extended Valley Switching for Wide Load Ranges
- Small Frequency Variation for Wide Load Ranges
- Advanced Burst-Mode Operation for Low Standby Power Consumption
- Pulse-by-Pulse Current Limit
- Protection Functions: Overload Protection (OLP), Internal Thermal
Shutdown (TSD) with Hysteresis Under-Voltage Lockout (UVLO) with
Hysteresis
- Internal Startup Circuit
- Internal High-Voltage SenseFET: 700V
- Built-in Soft-Start: 5ms
Applications
Auxiliary Power Supplies for LCD TV, LCD Monitor, Personal
Computer, and White Goods
Description
A Valley Switching Converter (VSC) generally shows lower EMI and
higher power conversion efficiency than a conventional
hard-switched converter with a fixed switching frequency. The
FSQ510 (H or M) is an integrated valley switching pulse width
modulation (VSPWM) controller and SenseFET specifically designed
for offline switch-mode power supplies (SMPS) for valley switching
with minimal external components. The VS-PWM controller includes an
integrated oscillator, under-voltage lockout (UVLO), leading-edge
blanking (LEB), optimized gate driver, internal soft-start,
temperature-compensated precise current sources for loop
compensation, and self-protection circuitry.
Compared with discrete MOSFET and PWM controller solutions, the
FSQ510 (H or M) can reduce total cost, component count, size and
weight; while simultaneously increasing efficiency, productivity,
and system reliability. This device provides a platform for
cost-effective designs of a valley switching flyback converters.
Absolute Maximum Ratings
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.
Symbol | Parameter | Min. | Max. | Unit |
VSTR | Vstr Pin Voltage | | 500 | V |
VDS | Drain Pin Voltage | | 700 | V |
VCC | Supply Voltage | | 20 | V |
VFB | Feedback Voltage Range | -0.3 | Internally Clamped(5) | V |
VSync | Sync Pin Voltage | -0.3 | 6.5 | V |
PD | Total Power Dissipation | 7-DIP | | 1.38 | W |
7-MLSOP |
8-DIP | | 1.47 |
TJ | Maximum Junction Temperature | | +150 | °C |
Recommended Operating Junction Temperature(6) | -40 | +140 |
TSTG | Storage Temperature | -55 | +150 | °C |
Notes:
5. VFB is internally clamped at 6.5V (ICLAMP_MAX<100uA) which
has a tolerance between 6.2V and 7.2V.
6. The maximum value of the recommended operating junction
temperature is limited by thermal shutdown.
Application Circuit
Internal Block Diagram
Stock Offer (Hot Sell)
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