LM5025B集成电路（IC）的PMIC-稳压器-DCDC开关式控制器规格书PDF中文资料

LM5025B属于集成电路（IC）的PMIC-稳压器-DCDC开关式控制器。由美国德州仪器公司制造生产的LM5025BDC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。

1FEATURES

2• Internal Start-Up Bias Regulator

• 3A Compound Main Gate Driver

• Programmable Line Under-Voltage Lockout

(UVLO) with Adjustable Hysteresis

• Voltage Mode Control with Feed-Forward

• Adjustable Dual Mode Over-Current Protection

• Programmable Overlap or Deadtime between

the Main and Active Clamp Outputs

• Volt x Second Maximum Duty Cycle Clamp

• Programmable Soft-Start

• Current Sense Leading Edge Blanking

• Single Resistor Programmable Oscillator

• Oscillator Up / Down Sync Capability

• Precision 5V Reference

• Thermal Shutdown

PACKAGES

• TSSOP-16

• WSON-16 (5x5 mm) Thermally Enhanced

DESCRIPTION

The LM5025B is a functional variant of the LM5025

active clamp PWM controller. The functional

differences of the LM5025B are as follows:

The maximum PWM duty cycle is limited to less

than 75% to reduce voltage stress on the power

MOSFETs.

The CS2 hiccup mode threshold is increased to

0.5V

The CS2 filter discharge device is disabled

The VCC regulator continues to operate when the

line UVLO is below the threshold of normal

operation

The VREF regulator is switched off when the line

UVLO input falls below the operating threshold

The internal 5kΩ COMP pin pull-up resistor is

removed

The LM5025B PWM controller contains all of the

features necessary to implement power converters

utilizing the Active Clamp / Reset technique. With the active clamp technique, higher efficiencies and

greater power densities can be realized compared to

conventional catch winding or RDC clamp / reset

techniques. Two control outputs are provided, the

main power switch control (OUT_A) and the active

clamp switch control (OUT_B). The two internal

compound gate drivers parallel both MOS and Bipolar

devices, providing superior gate drive characteristics.

This controller is designed for high-speed operation

including an oscillator frequency range up to 1MHz

and total PWM and current sense propagation delays

less than 100ns.

The LM5025B includes a high-voltage start-up

regulator that operates over a wide input range of

13V to 100V. Additional features include: Line Under

Voltage Lockout (UVLO), softstart, oscillator

UP/DOWN sync capability, precision reference and

thermal shutdown.