NCP1072P100G datasheet(10/26 Pages) ONSEMI

Part #	NCP1072P100G

Description	High-Voltage Switcher for Low Power Offline SMPS

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1072, NCP1075

http://onsemi.com

10

APPLICATION INFORMATION

Introduction

The NCP1072/NCP1075 offers a complete current−mode

control solution. The component integrates everything

needed to build a rugged and low−cost Switch−Mode Power

Supply (SMPS) featuring low standby power. The Quick

Selection Table on page 2 details the differences between

references, mainly peak current setpoints and operating

frequency.

• Current−mode operation: the controller uses

current−mode control architecture.

• 700 V – 11 W Power MOSFET: Due to

ON Semiconductor Very High Voltage Integrated

Circuit technology, the circuit hosts a high−voltage

power MOSFET featuring a 11

W RDS(on) – TJ = 25°C.

This value lets the designer build a power supply up to

10 W operated on universal mains. An internal current

source delivers the startup current, necessary to crank

the power supply.

• Dynamic Self−Supply: Due to the internal high voltage

current source, this device could be used in the

application without the auxiliary winding to provide

supply voltage.

• Short circuit protection: by permanently monitoring the

feedback line activity, the IC is able to detect the

presence of a short−circuit, immediately reducing the

output power for a total system protection. A tSCP timer

is started as soon as the feedback current is below

threshold, IFB(fault), which indicates the maximum peak

current. If at the end of this timer the fault is still

present, then the device enters a safe, auto−recovery

burst mode, affected by a fixed timer recurrence,

trecovery. Once the short has disappeared, the controller

resumes and goes back to normal operation.

• Built−in VCC Over Voltage Protection: when the

auxiliary winding is used to bias the VCC pin (no DSS),

an internal active clamp connected between VCC and

ground limits the supply dynamics to VCC(clamp). In

case the current injected in this clamp exceeds a level

of 6.0 mA (minimum), the controller immediately stops

switching and waits a full timer period (trecovery) before

attempting to restart. If the fault is gone, the controller

resumes operation. If the fault is still there, e.g. a

broken opto−coupler, the controller protects the load

through a safe burst mode.

• Line detection: An internal comparator monitors the

drain voltage as recovering from one of the following

situations:

♦ Short Circuit Protection,

♦ VCC OVP is confirmed,

♦ UVLO

♦ TSD

If the drain voltage is lower than the internal threshold

(VHV(EN)), the internal power switch is inhibited. This

avoids operating at too low ac input. This is also called

brown−in function in some fields.

• Frequency jittering: an internal low−frequency

modulation signal varies the pace at which the

oscillator frequency is modulated. This helps spreading

out energy in conducted noise analysis. To improve the

EMI signature at low power levels, the jittering remains

active in frequency foldback mode.

• Soft−Start: a 1 ms soft−start ensures a smooth startup

sequence, reducing output overshoots.

• Frequency foldback capability: a continuous flow of

pulses is not compatible with no−load/light−load

standby power requirements. To excel in this domain,

the controller observes the feedback current

information and when it reaches a level of IFBfold, the

oscillator then starts to reduce its switching frequency

as the feedback current continues to increase (the power

demand continues to reduce). It can go down to 25 kHz

(typical) reached for a feedback level of IFBfold(end)

(100

mA roughly). At this point, if the power continues

to drop, the controller enters classical skip−cycle mode.

• Skip: if SMPS naturally exhibits a good efficiency at

nominal load, they begin to be less efficient when the

output power demand diminishes. By skipping

un−needed switching cycles, the NCP1072/NCP1075

drastically reduces the power wasted during light load

conditions.

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NCP1072P100G Datasheet(PDF) 10 Page - ON Semiconductor

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