NCP1200P60 Introduction
The NCP1200P60 is an efficient controller for ultra-compact switch-mode power supplies (SMPS). It enables cost-effective designs for offline battery chargers or standby SMPS with minimal external components. Operating at a fixed 60 kHz, it efficiently drives low gate-charge devices like MOSFETs and IGBTs, while current-mode control ensures low noise and reliable pulse-by-pulse protection.
The skip-cycle mode enhances light-load efficiency without acoustic noise, and its self-supplied design eliminates the need for auxiliary winding, supporting operation under low output voltage or short-circuit conditions.
NCP1200P60 Symbol
NCP1200P60 Footprint
NCP1200P60 3D Model
NCP1200P60 Pin Connections
Adj: This pin lets you adjust the level at which the cycle skipping process takes place.
FB: By connecting an Optocoupler to this pin, the peak current setpoint is adjusted accordingly to the output power demand.
CS: This pin senses the primary current and routes it to the internal comparator via an L.E.B.
GND: The IC ground.
Drv: The driver's output to an external MOSFET.
VCC: This pin is connected to an external bulk capacitor of typically 10 µF.
NC: This un-connected pin ensures adequate creepage distance.
HV: Connected to the high-voltage rail, this pin injects a constant current into the VCC bulk capacitor.
NCP1200P60 Typical Application
NCP1200P60 Internal Circuit Architecture
NCP1200P60 Specification
| Specification | Details |
| Supply Voltage | 9 V ~ 16 V |
| Package Type | 8-PDIP |
| Operating Frequency | 60 kHz |
| Standby Power Consumption | <100 mW at no load |
| Startup Current | <30 µA |
| Operating Current | ~1 mA |
| Output Drive Current | Up to 250 mA |
| Operating Temperature | -25°C ~ 125°C |
NCP1200P60 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
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant
NCP1200P60 Application
AC−DC Adapters
Offline Battery Chargers
Auxiliary/Ancillary Power Supplies (USB, Appliances, TVs, etc.)
NCP1200P60 Package
The NCP1200P60 in the 8-PDIP package is designed for easy integration into power supply circuits. This package measures approximately 9.8 mm × 6.35 mm, with a standard pin spacing of 2.54 mm, ensuring compatibility with most PCB layouts. The 8-PDIP format also provides good thermal performance, balancing functionality and affordability for compact power solutions.
How to Connect NCP1200P60?
To connect the NCP1200P60, start by wiring the HV pin to the high-voltage input rail to supply power to the IC. Add a bulk capacitor between the VCC pin and ground to stabilize the supply. For the output stage, connect the Drv pin to the gate of an external MOSFET for driving the switching circuit.
Next, link the CS pin to a current-sensing resistor to monitor the primary current, and connect the FB pin to an optocoupler for feedback control based on output power demand. Ensure the GND pin is properly grounded. Leave the NC pin unconnected to maintain safety spacing. Finally, adjust the Adj pin as needed to fine-tune the skip cycle mode for light load efficiency.
FAQs
Does the NCP1200P60 require auxiliary winding for power?
No, the IC is self-supplied through its high-voltage pin (HV), eliminating the need for an auxiliary winding.
How does the IC improve efficiency at light loads?
It features a skip cycle mode that reduces switching frequency during low-power demands, ensuring high efficiency without generating acoustic noise.
What protections are included in the NCP1200P60?
The NCP1200P60 integrates features like output short-circuit protection and pulse-by-pulse current control to enhance safety and reliability.
