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Compact, 36V H-Bridge Transformer Driver for Isolated Supplies

Wide-Range Transformer Driver Simplifies Isolated Power Designs

产品详情

主要特征

Parametric specs for Transformer Drivers
Application (VIN) Industrial (24V)
VIN (V) (min) 5
VIN (V) (max) 36
Driver Output Resistance (Ω) (max) .95
Max. IOUT (A) .64
Topology Full-Bridge
Switching Frequency (kHz) 450
IQ (mA) (max) 8
Package/Pins TDFN-CU/10
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes)
3.63
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参量

Parametric specs for Transformer Drivers
Application (VIN) Industrial (24V)
VIN (V) (min) 5
VIN (V) (max) 36
Driver Output Resistance (Ω) (max) .95
Max. IOUT (A) .64
Topology Full-Bridge
Switching Frequency (kHz) 450
IQ (mA) (max) 8
Package/Pins TDFN-CU/10
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes)
3.63

主要特征

  • Simple, Flexible Design
    • 5V to 36V Supply Range
    • Up to 91% Efficiency
    • Provides over 15W to Transformer
    • Undervoltage Lockout
    • Internal or External Clock Source
    • Synchronous Clock Output (MAX22258)
    • Programmable Overcurrent Threshold
    • 30ns to 200ns Adjustable Deadtime (MAX22258)
  • Robust Integrated System Protection
    • Fault Detection and Indication
    • Overcurrent Limiting up to 1A
    • Overtemperature Protection
    • Precision Internal Clock Source (±6%) Prevents Excessive Transformer Core Losses Due to Frequency Shift
    • Wide Temperature Range: -40°C to +125°C
  • Space Savings
    • Small 3mm x 3mm 10-Pin TDFN Package (MAX22256A/B/C) with 0.5mm Pitch
    • Small 4mm x 5mm 14-Pin TSSOP Package (MAX22258) with 0.65mm Pitch

应用/用途

  • Isolated Motor Drive Gate Power Supply
  • Isolated +24V PLC Field Supply

描述

The MAX22256/MAX22258 integrated primary-side controllers and H-bridge drivers for isolated power-supply circuits feature a precision on-board oscillator, protection circuitry, and internal MOSFETs to provide up to 650mARMS of current to the primary winding of a transformer. These devices feature an internal 450kHz (typ) oscillator and can also be driven by an external clock to synchronize multiple devices and control EMI. An internal flip-flop stage guarantees a fixed 50% duty-cycle to prevent DC current flow in the transformer as long as the clock period is constant.

The MAX22256/MAX22258 operate from a wide single-supply voltage range from 5V to 36V and include undervoltage lockout for controlled startup. Break-before-make switching is integrated to prevent cross-conduction of the H-bridge MOSFETs. A resistor-adjustable overcurrent limit allows primary-side limiting of load currents on the transformer’s secondary side and thermal shutdown circuitry provides additional protection against excessive power dissipation.

The MAX22256A features a 30ns (typ) dead time for conventional H-bridge switching topologies. The MAX22256B/C feature a fixed dead time of 60ns (typ) and 100ns (typ), respectively, and are optimized for the zero-voltage switching of an LLC topology. The MAX22258 features a resistor-programmable dead time and a synchronized clock output (CLKO).

简化框图

MAX22256, MAX22258: Typical Operating Circuit MAX22256, MAX22258: Typical Operating Circuit Zoom icon

Technical Docs

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心

采样:
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