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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.
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
| 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) | $0.73 @1k |
技术文档
| 数据资料 | 电流模式PWM控制器，用于隔离型电源 | Dec 24, 2001 | |
| 应用笔记 | 设计紧凑的电信电源 |
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描述
The MAX5022 evaluation kit (EV kit) is a fully assembled and tested 5W flyback converter circuit board. The power supply is configured for an isolated +5VDC output voltage that can supply up to 1A of current. The line input voltage range is from 85VAC to 265VAC or 120VDC to 375VDC.
The MAX5022 EV kit demonstrates high efficiency up to 80% at 262kHz switching frequency. This high efficiency is achieved by using a single transistor (MOSFET), flyback-converter topology providing output power up to 5W. The surface-mount transformer has a tertiary winding to power the MAX5022 IC after startup. An optocoupler along with the transformer provide input-to-output isolation up to 4500VDC.
Warning: The MAX5022 EV kit is designed to operate with high voltages. Dangerous voltages are present on this EV kit and on equipment connected to it. Users who power up this EV kit or the power sources connected to it must be careful to follow safety procedures appropriate for working with high-voltage electrical equipment.
Under severe fault or failure conditions, this EV kit may dissipate large amounts of power, which could result in the mechanical ejection of a component or of component debris at high velocity. Operate this kit with care to avoid possible personal injury.
特征
- 85VAC to 265VAC or 120VDC to 375VDC Input Range
- Isolated Output Voltage: +5VDC at 1A
- Input-to-Output Isolation Up to 4500VDC
- Fully Assembled and Tested
- Efficiency Up to 80%
- 2% Output Voltage Regulation Over Line and Load
参量
| 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) | $0.73 @1k |
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
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.
技术文档
| 数据资料 | 电流模式PWM控制器，用于隔离型电源 | Dec 24, 2001 | |
| 应用笔记 | 设计紧凑的电信电源 |
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