Description

The IMP38C42EPA is a fixed frequency, high-performance current-mode PWM controller. It is pin compatible with bipolar 384x devices but offers improvements due to IMP's BiCMOS processing and circuit design. Some notable improvements include zero cross-conduction/shoot-through current, reduced start-up and operating current, lower current-sense delay, higher frequency operation, full supply voltage swing at the output, and a 1% trimmed voltage reference.

One of the key features of the IMP38C42EPA is its output driver stage, which has zero cross-conduction current. A proprietary output state-machine monitors each output MOSFET, ensuring zero cross-conduction current. This is a unique feature in the PWM device industry.

Specifications and features

• 384x Series Pinout with BiCMOS Technology
• Zero Cross-Conduction Current by Design
• 1MHz Operation
• 65ns Maximum Current-Sense Delay
• 120µA Maximum Start-Up Current
• 1.5mA Maximum Operating Current
• High Output Current Drive:
• 1.0A for IMP38HC4x
• 0.5A for IMP38C4x
• 20V Maximum Supply Voltage
• 2.5V, 1%, Trimmed Error Amplifier Reference
• Trimmed Oscillator Discharge Current
• Pin-for-Pin Enhanced Replacements for Micrel MIC38C/HC4x and GMT38C4x/HC4x

Application Scenarios

The IMP38C42EPA is suitable for various applications that require a fixed frequency, high-performance current-mode PWM controller. It can be used in power supply circuits, motor control systems, LED lighting systems, and other electronic devices that require precise control over the power delivery.

Comparison

• Improved performance due to BiCMOS processing and circuit design
• Zero cross-conduction/shoot-through current
• Reduced start-up and operating current
• Lower current-sense delay
• High-frequency operation
• Full supply voltage swing at the output
• 1% trimmed voltage reference
• Zero cross-conduction current in the output driver stage

• None identified