先頭に戻る

絶縁電源用、電流モードPWMコントローラ

SOT23ユニバーサルオフライン電源コントローラ

製品の詳細

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.

主な機能

  • 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

アプリケーション/用途

  • 絶縁型電源
  • 低電力テレコム電源
  • 携帯電話チャージャ
  • スタンドバイ電源
  • ユニバーサルオフライン電源
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)
$0.73 @1k
全て表示する

簡略化されたブロック図

MAX5021、MAX5022:標準動作回路 MAX5021、MAX5022:標準動作回路 Zoom icon

技術資料

データシート 絶縁電源用、電流モードPWMコントローラ Dec 24, 2001
アプリケーションノート コンパクトなテレコム用電源の設計

設計と開発

以下タイトルをクリックして詳細をご覧ください。

説明

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.

詳細を見る

特長

  • 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

/jp/design/design-tools/ee-sim.html?

サポートとトレーニング

ナレッジベースを検索して技術質問への回答を探す。

絞り込まれた検索

マキシムでは、お客様の技術的質問にお答えするため、アプリケーションエンジニアの専任チームも配置しています。 サポートセンター をご覧ください。

パラメーター

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)
$0.73 @1k

主な機能

  • 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

アプリケーション/用途

  • 絶縁型電源
  • 低電力テレコム電源
  • 携帯電話チャージャ
  • スタンドバイ電源
  • ユニバーサルオフライン電源

説明

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.

簡略化されたブロック図

MAX5021、MAX5022:標準動作回路 MAX5021、MAX5022:標準動作回路 Zoom icon

技術資料

データシート 絶縁電源用、電流モードPWMコントローラ Dec 24, 2001
アプリケーションノート コンパクトなテレコム用電源の設計

サポートとトレーニング

ナレッジベースを検索して技術質問への回答を探す。

絞り込まれた検索

マキシムでは、お客様の技術的質問にお答えするため、アプリケーションエンジニアの専任チームも配置しています。 サポートセンター をご覧ください。