NCP1217 - ON Semiconductor

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

NCP1217
Manufacturer

ON Semiconductor
ChipWorker Part#

CW327579736
RoHS

Lead free / RoHS Compliant
Description

AC-DC Offline Switching Controllers/Regulators
Documentation

Datasheet

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NCP1217 Specifications

Attribute	Attribute Value

Part Number	NCP1217
Manufacturer	ON Semiconductor
ChipWorker Part#	CW327579736
Documentation	Datasheet
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RoHS	RoHS Compliant

Product Description

Housed in a SOIC-7 or PDIP-7 package, the NCP1217 represents the second generation of NCP1203-based controllers. Thanks to its high drive capability, NCP1217 drives large gate-charge MOSFETs, which together with internal ramp compensation and built-in over voltage protection, ease the design of modern AC/DC adapters. NCP1217 offers a true alternative to UC384X-based designs.With an internal structure operating at different fixed frequencies (65, 100, 133kHz), the controller features a high-voltage start-up FET, which ensures a clean and loss less startup sequence. Its current-mode control topology provides an excellent input audio-susceptibility and inherent pulse-by-pulse control. Internal ramp compensation easily prevents subharmonic oscillations from taking place in continuous conduction mode designs.When the current setpoint falls below a given value, e.g. the output power demand diminishes, the IC automatically enters the so-called skip cycle mode and provides excellent efficiency at light loads. Because this occurs at a user adjustable low peak current, no acoustic noise takes place.The NCP1217 features two efficient protective circuitries: 1) in presence of an over-current condition, the output pulses are disabled and the device enters a safe burst mode, trying to re-start. Once the default has gone, the device auto-recovers. 2) if an external signal (e.g. a temperature sensor) pulls pin1 above 3.2V, output pulses are immediately stopped and the NCP1217 stays latched in this position. Reset occurs when the V collapses to ground, e.g. the user un-plugs the power supply.
Features
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Current-Mode with adjustable skip-cycle capability
Built-in internal ramp compensation
Auto-recovery internal output short-circuit protection
Full latch-off if Adjustment pin is brought high
Extremely low no-load standby power
Internal temperature shutdown
500mA peak current capability
Fixed frequency versions at 65kHz, 100kHz and 133kHz
Direct optocoupler connection
Internal Leading Edge Blanking
SPICE models available for TRANsient and AC analysis
Internal 1ms Soft start (A version only)
Limited Duty Cycle to 50% (A version only)
Pb-Free Packages are Available

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