ISL6726 Datasheet, PDF (1/20 Pages) Intersil Corporation – Active Clamp Forward PWM Controller

Active Clamp Forward PWM Controller
ISL6726
The ISL6726 is a highly featured single-ended PWM controller
intended for applications using the active clamp forward
converter topology in either n- or p-channel active clamp
configurations, the asymmetric half-bridge topology, and the
standard forward topologies with synchronous rectification. It is a
current-mode PWM controller with many features designed to
simplify its use. Among its many features are a precision
oscillator which allows accurate control of the deadtime and
maximum duty cycle, bi-directional synchronization with 180°
phase shift for interleaving applications, adjustable soft-start and
soft-stop, a low power disable mode, and average current limit
for “brick-wall” overcurrent protection.
This advanced BiCMOS design features low start-up and
operating currents, adjustable switching frequency to greater
than 1MHz, high current FET drivers, and very low propagation
delays for a fast response to overcurrent faults.
Applications
• Telecom and Datacom Power Supplies
• AC/DC Power Supplies
• Battery Chargers
Features
• Precision Maximum Duty Cycle and Deadtime Control
• 125µA Typical Start-up Current
• Adjustable Peak and Average Current Limit Protection
• Programmable Oscillator Frequency
• Bi-Directional Synchronization with 180° Phase Shift for
Interleaved Converter Applications
• Adjustable Soft-Start and Selectable Soft-Stop
• Selectable Minimum Duty Cycle Clamp for Synchronous
Rectifier Applications
• Programmable Slope Compensation
• Supports N- and P-Channel Active Clamp FETs
• Programmable Switch Timing Between Main and Active Clamp
Outputs
• Programmable Undervoltage Lock-Out (UV)
• Input Voltage Dependent Duty Cycle Clamp
• ENABLE Input with Low Power Disable
• Internal Over-Temperature Protection
• Pb-Free (RoHS Compliant)
+VIN
+VIN
OUTM
LEVEL
SHIFT
-VIN
LEVEL
SHIFT
OUTAC
OUTM
OUTAC
-VIN
N- or P- CHANNEL ACTIVE CLAMP FORWARD
OUTAC
ASYMMETRIC HALF-BRIDGE
January 31, 2011
1
FN7654.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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