Texas Instruments LM5021
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 currentmode control. The LM5021 features include an ultralow (25 µA) start-up current, which minimizes power losses in the high voltage start-up network. This high performance 8pin IC has total propagation delays less than 100 ns and a 1-MHz capable oscillator that is programmed with a single resistor.| Part No. | LM5021 |
|---|---|
| Datasheet | LM5021 Download |
| Manufacturer |  Texas Instruments |
| Description | PWM Controller |
| Buy | Stock & Price |
FEATURES
●1 Ultra-low Startup 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)
● Undervoltage Lockout (UVLO) with Hysteresis
● Cycle-by-Cycle Overcurrent Protection
● Hiccup Mode for Continuous Overload Protection
● Leading Edge Blanking of Current Sense Signal
● Packages: VSSOP-8 or PDIP-8 2
APPLICATIONS
● DCM/CCM Flyback Converters● Industrial Power Conversion
● SMPS for Smart Meters and Audio Amplifiers
● Building Automation and White Goods SMPS
● Isolated Telecom Power Supplies 3
DESCRIPTION
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.
