Part Number: 1200P60
Function: PWM Current−Mode Controller
Package: DIP, SOP 8 Pin type
Manufacturer: ON Semiconductor
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Description
1200P60 is PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies.
A PWM (Pulse Width Modulation) current-mode controller is a type of control IC (Integrated Circuit) used in power electronics to regulate the output current of a switching power supply.
Housed in SOIC−8 or PDIP−8 package, the NCP1200 represents a major leap toward ultra−compact Switchmode Power Supplies. Due to a novel concept, the circuit allows the implementation of a complete offline battery charger or a standby SMPS with few external components. Furthermore, an integrated output short−circuit protection lets the designer build an extremely low−cost AC−DC wall adapter associated with a simplified feedback scheme.
With an internal structure operating at a fixed 40 kHz, 60 kHz or 100 kHz, the controller drives low gate−charge switching devices like an IGBT or a MOSFET thus requiring a very small operating power. Due to current−mode control, the NCP1200 drastically simplifies the design of reliable and cheap offline converters with extremely low acoustic generation and inherent pulse−by−pulse control. When the current setpoint falls below a given value, e.g. the output power demand diminishes, the IC automatically enters the skip cycle mode and provides excellent efficiency at light loads. Because this occurs at low peak current, no acoustic noise takes place. Finally, the IC is self−supplied from the DC rail, eliminating the need of an auxiliary winding. This feature ensures operation in presence of low output voltage or shorts.
Features:
• No Auxiliary Winding Operation
• Internal Output Short−Circuit Protection
• Extremely Low No−Load Standby Power
• Current−Mode with Skip−Cycle Capability
• Internal Leading Edge Blanking
• 250 mA Peak Current Source/Sink Capability
• Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz
• Direct Optocoupler Connection
• Built−in Frequency Jittering for Lower EMI
• SPICE Models Available for TRANsient and AC Analysis
• Internal Temperature Shutdown
PWM current-mode controllers are commonly used in switch-mode power supplies, buck converters, boost converters, and flyback converters, among others. These controllers provide efficient and precise control over the output current, making them suitable for a wide range of power electronics applications.
Typical Applications:
• AC−DC Adapters
• Offline Battery Chargers
• Auxiliary/Ancillary Power Supplies (USB, Appliances, TVs, etc.)