LM5021 Texas instruments

LM5021

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LM5021

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Описание

The LM5021 off-line pulse width modulation (PWM) controller contains all of the features needed to implement highly efficient off-line single-ended flyback and forward power converters using current-mode control. The LM5021 features include an ultra-low (25 µA) start-up current, which minimizes power losses in the high voltage start-up network. A skip cycle mode reduces power consumption with light loads for energy conserving applications (ENERGY STAR®, CECP, and so forth). Additional features include under-voltage lockout, cycle-by-cycle current limit, hiccup mode overload protection, slope compensation, soft-start and oscillator synchronization capability. This high performance 8-pin IC has total propagation delays less than 100 ns and a 1-MHz capable oscillator that is programmed with a single resistor.

Ultra Low Start-up Current (25 µA maximum)
Current Mode Control
Skip Cycle Mode for Low Standby Power
Single Resistor Programmable Oscillator
Synchronizable Oscillator
Adjustable Soft-Start
Integrated 0.7 A Peak Gate Driver
Direct Opto-Coupler Interface
Maximum Duty Cycle Limiting (80% for LM5021-1
or 50% for LM5021-2)
Slope Compensation (LM5021-1 Only)
Under Voltage Lockout (UVLO) with Hysteresis
Cycle-by-Cycle Over-Current Protection
Hiccup Mode for Continuous Overload Protection
Leading Edge Blanking of Current Sense Signal
Packages: VSSOP-8 or PDIP-8

Topology	Flyback, Forward
Control mode	Secondary-side regulation
Duty cycle (max) (%)	80
Switching frequency (max) (kHz)	1000
Features	CCM, DCM, Frequency synchronization, Leading edge blanking, SSR
UVLO thresholds on/off (V)	20/7.25
Operating temperature range (°C)	-40 to 125
Rating	Catalog
Gate drive (typ) (A)	0.3