NCP1216D133 datasheet(9/18 Pages) ONSEMI

Part #	NCP1216D133

Description	PWM Current-Mode Controller for High-Power Universal Off-Line Supplies

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1216, NCP1216A

http://onsemi.com

9

APPLICATION INFORMATION

Introduction

The NCP1216 implements a standard current mode

architecture where the switch−off event is dictated by the

peak current setpoint. This component represents the ideal

candidate where low part count is the key parameter,

particularly in low−cost AC−DC adapters, TV power

supplies etc. Due to its high−performance High−Voltage

technology, the NCP1216 incorporates all the necessary

components normally needed in UC384X based supplies:

timing components, feedback devices, low−pass filter and

self−supply. This later point emphasizes the fact that ON

Semiconductor’s NCP1216 does NOT need an auxiliary

winding to operate: the product is naturally supplied from

the high−voltage rail and delivers a VCC to the IC. This

system is called the Dynamic Self−Supply (DSS):

Dynamic Self−Supply (DSS): Due to its Very High

Voltage

Integrated

Circuit

(VHVIC)

technology,

ON Semiconductor’s NCP1216 allows for a direct pin

connection to the high−voltage DC rail. A dynamic current

source charges up a capacitor and thus provides a fully

independent VCC level to the NCP1216. As a result, there is

no need for an auxiliary winding whose management is

always a problem in variable output voltage designs (e.g.

battery chargers).

Adjustable Skip Cycle Level: By offering the ability to tailor

the level at which the skip cycle takes place, the designer can

make sure that the skip operation only occurs at low peak

current. This point guarantees a noise−free operation with

cheap transformers. Skip cycle offers a proven mean to

reduce the standby power in no or light loads situations.

Internal Frequency

Dithering

for

Improved

EMI

Signature: By modulating the internal switching frequency

with the DSS VCC ripple, natural energy spread appears and

softens the controller’s EMI signature.

Wide Switching − Frequency Offered with Different

Options (65 kHz − 100 kHz − 133 kHz): Depending on the

application, the designer can pick up the right device to help

reducing magnetics or improve the EMI signature before

reaching the 150 kHz starting point.

Ramp Compensation: By inserting a resistor between the

Current Sense (CS) pin and the actual sense resistor, it

becomes possible to inject a given amount of ramp

compensation since the internal sawtooth clock is routed to

the CS pin. Sub−harmonic oscillations in Continuous

Conduction Mode (CCM) can thus be compensated via a

single resistor.

Over

Current

Protection

(OCP):

By

continuously

monitoring the FB line activity, NCP1216 enters burst mode

as soon as the power supply undergoes an overload. The

device enters a safe low power operation, which prevents

from any lethal thermal runaway. As soon as the default

disappears, the power supply resumes operation. Unlike

other

controllers,

overload

detection

is

performed

independently of any auxiliary winding level. In presence of

a bad coupling between both power and auxiliary windings,

the short circuit detection can be severely affected. The DSS

naturally shields you against these troubles.

Wide Duty−Cycle Operation: Wide mains operation requires

a large duty−cycle excursion. The NCP1216 can go up to 75%

typically.

For

Continuous

Conduction

Mode

(CCM)

applications, the internal ramp compensation lets you fight

against sub−harmonic oscillations.

Low Standby Power: If SMPS naturally exhibit a good

efficiency at nominal load, they begin to be less efficient

when the output power demand diminishes. By skipping

unnecessary switching cycles, the NCP1216 drastically

reduces the power wasted during light load conditions. In

no−load conditions, the NPC1216 allows the total standby

power to easily reach next International Energy Agency

(IEA) recommendations.

No Acoustic Noise While Operating: Instead of skipping

cycles at high peak currents, the NCP1216 waits until the

peak current demand falls below a user−adjustable 1/3 of the

maximum limit. As a result, cycle skipping can take place

without having a singing transformer, one can thus select

cheap magnetic components free of noise problems.

External MOSFET Connection: By leaving the external

MOSFET external to the IC, you can select avalanche proof

devices, which in certain cases (e.g. low output powers), let

you work without an active clamping network. Also, by

controlling the MOSFET gate signal flow; you have an

option to slow down the device commutation, therefore

reducing the amount of ElectroMagnetic Interference

(EMI).

SPICE Model: A dedicated model to run transient

cycle−by−cycle simulations is available but also an

averaged version to help you closing the loop. Ready−to−use

templates can be downloaded in OrCAD’s PSpice and

INTUSOFT’s IsSpice from ON Semiconductor web site, in

the NCP1216 related section.

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