Features

• Low Start-Up Current: <250µA
• 50ns Current Sense Delay
• Current Mode Operation: To 500kHz
• Pin Compatible with UC1842 Series
• Undervoltage Lockout with Hysteresis
• No Cross-Conduction Current
• Trimmed Bandgap Reference
• 1A Totem Pole Output
• Trimmed Oscillator Frequency and Sink Current
• Active Pull-Down on Reference and Output During Undervoltage Lockout
• High Level Output Clamp: 18V
• Current Sense Leading Edge Blanking

Typical Application

Applications

• Off-Line Converters
• DC/DC Converters

Packaging

Datasheet

• LT1241 Series - High Speed Current Mode Pulse Width Modulators

Reliability Data

• R293 Reliability Data

LTspice

• LT1243 Demo Circuit - 300kHz Off-Line Power Supply (90-240VAC to 20V @ 1.5A)

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