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电流模式PWM控制器,用于隔离型电源

SOT23通用离线式电源控制器

产品详情

主要特征

应用/用途

Parametric specs for Isolated Power Supplies
VIN (V) (min) 24
VIN (V) (max) 1000
Topology Flyback
Application (VIN) Networking (48V)
Power Over Ethernet (32-58V)
Telecom (36-72V)
Universal Off-line (90-240VAC)
Control Loop Current Mode
Feedback Opto
Switching Frequency (kHz) 262
Duty Cycle (%) (max) 75
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/6
UMAX/8
Budgetary
Price (See Notes)
0.77
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参量

Parametric specs for Isolated Power Supplies
VIN (V) (min) 24
VIN (V) (max) 1000
Topology Flyback
Application (VIN) Networking (48V)
Power Over Ethernet (32-58V)
Telecom (36-72V)
Universal Off-line (90-240VAC)
Control Loop Current Mode
Feedback Opto
Switching Frequency (kHz) 262
Duty Cycle (%) (max) 75
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/6
UMAX/8
Budgetary
Price (See Notes)
0.77

主要特征

  • Available in a Tiny 6-Pin SOT23 Package
  • 50µA Typical Startup Current
  • 1.2mA Typical Operating Current
  • Large UVLO Hysteresis of 14V
  • Fixed Switching Frequency of 262kHz ±12%
  • 50% Maximum Duty Cycle Limit (MAX5021)
  • 75% Maximum Duty Cycle Limit (MAX5022)
  • 60ns Cycle-by-Cycle Current-Limit Response Time

应用/用途

  • 隔离型电源
  • 低功耗电信电源
  • 移动电话充电器
  • 待机电源
  • 通用离线电源

描述

The MAX5021/MAX5022 current-mode PWM controllers contain all the control circuitry required for the design of wide input voltage range isolated power supplies. These devices are well suited for use in universal input (85VAC to 265VAC) off-line or telecom (-36VDC to -72VDC) power supplies.

An undervoltage lockout (UVLO) circuit with large hysteresis coupled with low startup and operating current reduce power dissipation in the startup resistor and allow use of ceramic bypass capacitors. The 262kHz switching frequency is internally trimmed to }12% accuracy; this allows the optimization of the magnetic and filter components resulting in compact, cost-effective power supplies. The MAX5021 with 50% maximum duty cycle and MAX5022 with 75% maximum duty cycle are recommended for forward converters and flyback converters, respectively. The MAX5021/MAX5022 are available in 6-pin SOT23, 8-pin µMAX, and 8-pin DIP packages and are rated for operation over the -40‹C to +85‹C temperature range.

简化框图

MAX5021、MAX5022:典型工作电路 MAX5021、MAX5022:典型工作电路 Zoom icon

支持和培训

在Maxim的知识库中搜索技术问题的答案

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