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LM5021MM-2/NOPB

Current-mode PWM controller, 100V, 1MHz, VSSOP-10

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Manufacturer Part：

LM5021MM-2/NOPB

Package：

VSSOP-10 (3x3mm)

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Description

Product Overview

The LM5021MM-2/NOPB from TI is a 100V current-mode PWM controller with 1MHz switching, integrated high-voltage start-up, and slope compensation in VSSOP-10 for isolated power supplies.

Key Specifications

Package VSSOP-10 (3x3mm)

Features

  • See datasheet for complete specifications
  • Industry-standard package

Applications

  • Industrial control
  • Consumer electronics
  • Communication equipment
  • Power management

The LM5021MM-2/NOPB from TI is a 100V current-mode PWM controller with 1MHz switching, integrated high-voltage start-up, and slope compensation in VSSOP-10 for isolated power supplies.

The LM5021MM-2/NOPB is a 100V current-mode PWM controller from TI in VSSOP-10, designed for isolated forward and flyback converters. The -2 version supports input voltages from 15V to 100V, suitable for telecom -48V and industrial 24V systems. The internal VCC regulator starts at 7.7V and can be self-biased from the transformer auxiliary winding after start-up, reducing IC power dissipation. The RT pin sets the switching frequency: fSW = 10kOhm / RSET x 1MHz (e.g., RSET = 20kOhm gives 500kHz). Current-mode control provides: 1) Cycle-by-cycle current limiting via the CS pin (0.5V threshold); 2) Inherent input voltage feed-forward for improved line regulation; 3) Slope compensation via an internal 50mV/us ramp added to the current sense signal. The COMP pin accepts the error amplifier output from the optocoupler (isolated feedback) or direct feedback (non-isolated). The SS pin controls soft-start: the internal 10uA current source charges an external capacitor, ramping the PWM duty cycle from 0% to maximum over tSS = CSS x 0.5V / 10uA. The UVLO pin uses an external resistor divider to set the start/stop voltage thresholds. The 2A peak gate drive directly drives external MOSFETs up to 50nC gate charge.

Pin Name Type Function
1 VCC Power Internal 7.7V regulator output (bypass with 0.1uF)
2 COMP Analog Error amplifier output / PWM comparator input
3 FB Input Feedback input (1.25V reference)
4 CS Input Current sense input (0.5V threshold)
5 SS Analog Soft-start capacitor (internal 10uA source)
6 RT Analog Switching frequency set resistor
7 GND Power Ground
8 OUT Output Gate drive output (2A peak)
9 VIN Power Input supply (15-100V for -2 version)
10 UVLO Input Under-voltage lockout set point (external divider)
  • Industrial control
  • Consumer electronics
  • Communication equipment
  • Power management
    • Manufacturer Part Number Package Notes
    Texas Instruments LM5021MM-1/NOPB VSSOP-10 Same device, 15-65V range
    Texas Instruments LM5025MM/NOPB VSSOP-10 Active-clamp forward controller
    onsemi NCP1252BSD1A2G TSOP-6 Current-mode PWM controller, 65V
    Analog Devices LT8316EMS#PBF MSOP-16 Isolated flyback, no optocoupler
    Infineon ICE3PCS01GXUMA1 PG-DSO-8 PFC controller, CCM, 250kHz
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    Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
     

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