MAX5021: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

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.

关键特性
  • 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
功能框图
MAX5021、MAX5022:典型工作电路
产品应用
  • 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
关键参数
Part NumberApplication (VIN)VIN
(V)
VIN
(V)
TopologyFeedbackFreq.
(kHz)
Duty Cycle
(%)
ISTARTUP
(mA)
ICC
(mA)
Gate Drive Current
(A)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
minmaxmaxmaxmaxmaxSee Notes
MAX5021
Networking (48V)
Power Over Ethernet (32-58V)
Telecom (36-72V)
Universal Off-line (90-240VAC)
241000Single-Ended ForwardOpto262500.0852.430.25-40 to +85
µMAX/8
PDIP(N)/8
SOT/6
$0.48 @1k
MAX5022Flyback75
µMAX/8
PDIP(N)/8
SOT/6
$0.69 @1k
数据手册DataSheet
英文MAX5021-MAX5022.pdfRev 1; 12/2001
开发工具
技术资料
订购型号
型号状况推荐替代产品封装温度RoHS/无铅
MAX5021EPA停止供货PDIP(N),;8引脚;81.9mm²-40°C至+85°CRoHS/无铅:否
MAX5021EUA停止供货MAX5021EUA+µMAX,;8引脚;15.6mm²-40°C至+85°CRoHS/无铅:否
MAX5021EUA+生产中µMAX,;8引脚;15.6mm²-40°C至+85°CRoHS/无铅:无铅
MAX5021EUA+T生产中uMAX;8引脚-40°C至+85°C参考数据资料
MAX5021EUA-T停止供货MAX5021EUA+TuMAX;8引脚-40°C至+85°C参考数据资料
MAX5021EUT+生产中SOT,;6引脚;9mm²-40°C至+85°CRoHS/无铅:无铅
MAX5021EUT+T生产中SOT,;6引脚;9mm²-40°C至+85°CRoHS/无铅:无铅
MAX5021EUT-T停止供货MAX5021EUT+TSOT,;6引脚;9mm²-40°C至+85°CRoHS/无铅:否
MAX5021EVKIT停止供货KIT;参考数据资料
MAX5021-MAX5022.pdf MAX5022
How to Minimize Power Dissipation in Li+ Linear Chargers MAX5021
MAX5021-MAX5022.pdf MAX5022