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MAX256

Maxim Integrated Products
Part Number MAX256
Manufacturer Maxim Integrated Products
Description 3W Primary-Side Transformer H-Bridge Driver
Published Jan 17, 2009
Detailed Description 19-3748; Rev 0; 8/05 KIT ATION EVALU E L B A AVAIL www.DataSheet4U.com 3W Primary-Side Transformer H-Bridge Driver fo...
Datasheet PDF File MAX256 PDF File

MAX256
MAX256

Overview
19-3748; Rev 0; 8/05 KIT ATION EVALU E L B A AVAIL www.
DataSheet4U.
com 3W Primary-Side Transformer H-Bridge Driver for Isolated Supplies General Description Features ♦ Provides Up to 3W to the Transformer in Isolated Power Supplies ♦ Single Supply +5V or +3.
3V Operation ♦ Internal Resistor-Programmable Oscillator Mode ♦ External Clock Mode with Watchdog ♦ Disable Mode ♦ Undervoltage Lockout ♦ Thermal Shutdown MAX256 The MAX256 is an integrated primary-side controller and H-bridge driver for isolated power-supply circuits.
The device contains an on-board oscillator, protection circuitry and internal FET drivers to provide up to 3W of power to the primary winding of a transformer.
The MAX256 can be operated using the internal programmable oscillator or can be driven by an external clock for improved EMI performance.
Regardless of the clock source being used, an internal flip-flop stage guarantees a fixed 50% duty cycle to prevent DC current flow in the transformer.
The MAX256 operates from a single-supply voltage of +5V or +3.
3V, and includes undervoltage lockout for controlled startup.
The device prevents cross-conduction of the H-bridge MOSFETs by implementing breakbefore-make switching.
Thermal shutdown circuitry provides additional protection against damage due to overtemperature conditions.
The MAX256 is available in the 8-pin thermally-enhanced SO package.
The device is specified for the automotive (-40°C to +125°C) temperature range.
Ordering Information PART MAX256ASA TEMP RANGE -40°C to +125°C PIN-PACKAGE 8 SO-EP* PKG CODE S8E-12 Applications Isolated Power Supplies Industrial Process Control Isolated Communications Links Medical Equipment Telecommunications *EP = Exposed paddle.
Typical Application Circuit +5V 4.
7µF 470nF Pin Configuration MAX256 MODE ST1 1:2.
6CT +5V ISOLATED 0.
1µF CK_RS VCC VCC 1 2 3 8 ST1 GND GND ST2 MAX256 7 6 CK_RS 47kΩ GND ST2 MODE 4 EP* SO-EP 5 *EXPOSED PAD IS CONNECTED TO GND +5V TO ISOLATED +5V TYPICAL APPLI...


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