R1242 系列
3A 30V输入带同步整流器功能和外置低侧晶体管的PWM降压DC/DC转换器

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  • 概述

    The R1242 Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 3A* output current. R1242 includes a soft start circuit and a latch or fold-back protection circuit. By simply using an inductor, resistors, a low side switch (FET), and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. Due to current mode PWM control, the R1242 provides a fast response and high efficiency.

    *) This is an approximate value, because output current depending on conditions and external parts.

  • 规格
    消费
    输入电压范围 5.0 V to 30.0 V (32.0 V)
    工作温度范围 -40°C to 85°C (125°C)
    电源电流 Typ. 800 µA (VIN = 30 V, SET VFB = 1.0 V)
    待机电流 Typ. 0 µA (VIN = 30 V, CE = “L”)
    输出电压范围 Externally Adjustable: 0.8 V to 15.0 V
    反馈电压 0.8 V
    反馈电压精度 ±12 mV
    输出电流 3 A
    振荡器频率 Externally Adjustable(Ver.A/B): 330 kHz to 1 MHz
    330 kHz (C/D), 500 kHz (E/F), 1 MHz (G/H)
    最大占空比 Typ. 88%
    封装 HSOP-8E

    保护回路/功能

    TSD ILX OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust
  • 技术资料
    • R1242S001A/B Typical Application

      R1242S001A/B Typical Application

      (VOUT=3.3V, 1MHz)

    • R1242S Efficiency vs. Output Current

      R1242S Efficiency vs. Output Current

  • 品质&封装
    • 有关产品的详细信息,请参见数据表。
    • 封装文件包括封装尺寸,卷带规格,卷带盘尺寸,功耗和建议的焊盘图案。
    • 请联系我们或我们的代理商以获取未发布的可靠性信息。

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功能说明

TSD 热关断电路
ILX LX Current Limit Function
OCP 过流保护
OVP 过压保护
UVLO 欠压锁定功能
OVLO Overvoltage Lockout Protection
Reverse 反向电流保护电路
Shutdown 关机功能
Soft Start 软启动功能
SSCG Spread Spectrum Clock Generator Function
PGOOD Power Good Output
Auto Discharge 自动放电功能
Anti-ringing Anti-ringing Switch Function
Sequencing Start-up Sequencing Control
Max Duty 最大占空比
Ext. Phase 外部可调相位补偿
LED Adjust LED High-speed Dimming Control

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分类:DC / DC开关稳压器

拓扑结构 Buck
输入电压
min (V)
5.0
输入电压
max (V)
30.0
输出电压
min (V)
0.8
输出电压
max (V)
15.0
输出电流
(mA)
3000
消费电流
(µA)
800