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Product Specification
Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback
SGP400
FEATURES
Linearly decreasing PWM frequency
Green-mode under light-load and zero-load
conditions
Constant voltage (CV) and constant current (CC)
No secondary feedback
Low start-up current (8µA)
Low operating current (3.6mA)
Leading-edge blanking
Constant power limit
Universal AC input range
Synchronized slope compensation
140°C OTP sensor with hysteresis
V
DD
over-voltage clamping
Cycle-by-cycle current limiting
Under-voltage lockout (UVLO)
Fixed PWM frequency with hopping
Gate output maximum voltage clamped at 17V
Small SOT-26 package
DESCRIPTION
This highly integrated PWM controller provides several
features to enhance the performance of low-power
flyback converters. To minimize standby power
consumption, the proprietary green-mode function
provides off-time modulation to linearly decrease the
switching frequency under light-load and zero-load
conditions. This green-mode function enables the power
supply to meet international power conservation
requirements. The supply voltage, V
DD
, is also used for
feedback compensation, to regulate the output voltage
without requiring a conventional TL431 and a
photo-coupler. The typical start-up current is only 8µA,
while the typical operating current can be as low as
3.6mA. A large start-up resistance could be used to
achieve even higher power conversion efficiency.
SGP400 integrates a frequency hopping function, which
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