NCP1234AD65R2G Fixed Frequency Current Mode Controller for Flyback
Converters
Features
Fixed−Frequency Current−Mode Operation with Built−In Ramp
Compensation
65 kHz or 100 kHz Oscillator Frequency version
Frequency Foldback then Skip Mode for Maximized Performance in
Light Load and Standby Conditions
Timer−Based Overload Protection with Latched (option A) or
Auto−Recovery (option B) Operation
High−voltage Current Source with Dynamic Self−Supply, Simplifying
the Design of the VCC Capacitor Frequency Modulation for Softened
EMI Signature, including during Frequency Foldback mode
Adjustable Overpower Compensation
Latch−off Input for Severe Fault Conditions, Allowing Direct
Connection of an NTC for Overtemperature Protection (OTP)
VCC Operation up to 28 V, with Overvoltage Detection 500 mA Peak
Source/Sink Current Drive Capability
4.0 ms Soft−Start
Internal Thermal Shutdown
Pin−to−Pin Compatible with the Existing NCP12xx Series
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Typical Applications
AC−DC Adapters for Notebooks, LCD, and Printers
Offline Battery Chargers
Consumer Electronic Power Supplies
Auxiliary/Housekeeping Power Supplies
PIN FUNCTION DESCRIPTION
| Pin No | Pin Name | Function | Pin Description |
|---|
| 1 | LATCH | Latch−Off Input | Pull the pin up or down to latch−off the controller. An internal
current source allows the direct connection of an NTC for over
temperature detection |
| 2 | FB | Feedback | An optocoupler collector to ground controls the output regulation. |
| 3 | CS | Current Sense | This Input senses the Primary Current for current−mode operation,
and Offers an overpower compensation adjustment. |
| 4 | GND | | IC Ground |
| 5 | DRV | Drive output | Drives external MOSFET |
| 6 | VCC | VCC input | This supply pin accepts up to 28 Vdc, with overvoltage detection |
| 7 | | | |
| 8 | HV | High−voltage pin | Connects to the bulk capacitor or the rectified AC line to perform
the functions of Start−up Current Source and Dynamic Self−Supply |
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