TL1454A
- Two Complete PWM Control Circuits
- Outputs Drive MOSFETs Directly
- Oscillator Frequency . . . 50 kHz to 2 MHz
- 3.6-V to 20-V Supply-Voltage Range
- Low Supply Current . . . 3.5 mA Typ
- Adjustable Dead-Time Control, 0% to 100%
- 1.26-V Reference
The TL1454A is a dual-channel pulse-width-modulation (PWM) control circuit, primarily intended for low-power, dc/dc converters. Applications include LCD displays, backlight inverters, notebook computers, and other products requiring small, high-frequency, dc/dc converters.
Each PWM channel has its own error amplifier, PWM comparator, dead-time control comparator, and MOSFET driver. The voltage reference, oscillator, undervoltage lockout, and short-circuit protection are common to both channels.
Channel 1 is configured to drive n-channel MOSFETs in step-up or flyback converters, and channel 2 is configured to drive p-channel MOSFETs in step-down or inverting converters. The operating frequency is set with an external resistor and an external capacitor, and dead time is continuously adjustable from 0 to 100% duty cycle with a resistive divider network. Soft start can be implemented by adding a capacitor to the dead-time control (DTC) network. The error-amplifier common-mode input range includes ground, which allows the TL1454A to be used in ground-sensing battery chargers as well as voltage converters.
技术文档
类型 | 标题 | 下载最新的英语版本 | 日期 | |||
---|---|---|---|---|---|---|
* | 数据表 | Dual-Channel Pulse-Width-Modulation (PWM) Control Circuit 数据表 (Rev. A) | 2002年 9月 25日 | |||
应用手册 | Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) | 2019年 3月 12日 | ||||
应用手册 | 了解开关模式电源中的升压功率级 | 1999年 3月 4日 | ||||
应用手册 | 了解开关模式电源中的降压功率级 | 1999年 3月 4日 | ||||
用户指南 | Designing with the TL1454 PWM Controller User's Guide | 1998年 12月 8日 |
设计和开发
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CIRCUIT060010 — PWM 发生器电路
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封装 | 引脚 | 下载 |
---|---|---|
PDIP (N) | 16 | 查看选项 |
SOIC (D) | 16 | 查看选项 |
SOP (NS) | 16 | 查看选项 |
SSOP (DB) | 16 | 查看选项 |
TSSOP (PW) | 16 | 查看选项 |
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- 引脚镀层/焊球材料
- MSL 等级/回流焊峰值温度
- MTBF/时基故障估算
- 材料成分
- 鉴定摘要
- 持续可靠性监测
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