Datasheet > LM5021-Q1_15

LM5021-Q1_15

更新时间： 2024-11-05 01:15:03

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LM5021-Q1 AC-DC Current-Mode PWM Controller

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LM5021-Q1

SNVSA90 –DECEMBER 2014

LM5021-Q1 AC-DC Current-Mode PWM Controller

1 Features

2 Applications

•

Qualified for Automotive Applications

•

DCM/CCM Flyback Converters

AEC-Q100 Qualified With the Following Results:

Industrial Power Conversion

SMPS for Smart Meters and Audio Amplifiers

Building Automation and White Goods SMPS

Isolated Telecom Power Supplies

–

Device Temperature Grade 1: –40°C to 125°C

Ambient Operating Temperature Range

–

Device HBM Classification Level 2: ±2 kV

Device CDM Classification Level C4B: 750 V

3 Description

•

Ultra-low Startup Current (25 µA Maximum)

Current Mode Control

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

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

Package: VSSOP-8

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.

Device Information⁽¹⁾

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM5021-Q1

VSSOP (8)

3.00 mm × 3.00 mm

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

Simplified Application Diagram

VOUT

90 ~ 264 Vac

VCC

LM5021

VIN

OUT

COMP GND

FEEDBACK

WITH

ISOLATION

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

12 3 4 5 6 7...34

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