LM5021-Q1_15 Datasheet, PDF (1/34 Pages) Texas Instruments – LM5021-Q1 AC-DC Current-Mode PWM Controller

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LM5021-Q1 AC-DC Current-Mode PWM Controller
LM5021-Q1
SNVSA90 – DECEMBER 2014
1 Features
•1 Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
– 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
• 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
• Package: VSSOP-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
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.
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
+
AC
90 ~ 264 Vac
+
VIN
VCC
LM5021
RT
OUT
SS
CS
COMP GND
FEEDBACK
WITH
ISOLATION
1
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.