SSL4101T datasheet(11/29 Pages) NXP

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SSL4101T

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Product data sheet

Rev. 1 — 21 April 2011

11 of 29

NXP Semiconductors

SSL4101T

GreenChip III+ SMPS control IC

7.2.9 Overvoltage protection (VOSENSE pin)

To prevent output overvoltage during load steps and mains transients, an overvoltage

protection circuit is built in.

As soon as the voltage on the VOSENSE pin exceeds the Vovp(VOSENSE) level, switching

of the power factor correction circuit is inhibited. Switching of the PFC recommences as

soon as the VOSENSE pin voltage drops below the Vovp(VOSENSE) level again.

When the resistor between pin VOSENSE and ground is open, the overvoltage protection

is also triggered.

7.2.10 PFC open loop protection (VOSENSE pin)

The power factor correction circuit does not start switching until the voltage on the

VOSENSE pin is above the Vth(ol)(VOSENSE) level. This protects the circuit from open loop

and VOSENSE short situations.

7.2.11 Driver (PFCDRIVER pin)

The driver circuit to the gate of the power MOSFET has a current sourcing capability of

typically

−500 mA and a current sink capability of typically 1.2 A. This permits fast turn-on

and turn-off of the power MOSFET for efficient operation.

7.3 Flyback controller

The SSL4101T includes a controller for a flyback converter. The flyback converter

operates in quasi-resonant or discontinuous conduction mode with valley switching. The

auxiliary winding of the flyback transformer provides demagnetization detection and

powers the IC after start-up.

7.3.1 Multimode operation

The SSL4101T flyback controller can operate in several modes; see Figure 6.

Fig 6.

Multimode operation flyback

discontinuous

with valley

switching

quasi resonant

PFC off

frequency

reduction

fsw(fb)max

output power

switching frequency

014aaa158

PFC on

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