SSL4101T datasheet(6/29 Pages) NXP

6 / 29 page

SSL4101T

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Product data sheet

Rev. 1 — 21 April 2011

6 of 29

NXP Semiconductors

SSL4101T

GreenChip III+ SMPS control IC

As soon as the flyback converter is started, the voltage on the FBCTRL pin is monitored. If

the output voltage of the flyback converter does not reach its intended regulation level in a

predefined time, the voltage on the FBCTRL pin reaches the Vto(FBCTRL) level and an error

is assumed. The SSL4101T then initiates a safe restart.

When one of the protection functions is activated, both converters stop switching and the

VCC voltage drops to Vth(UVLO). A latched protection recharges the capacitor CVCC via the

HV pin, but does not restart the converters. For a safe restart protection, the capacitor is

recharged via the HV pin and the device restarts (see block diagram, Figure 1).

In the event of an overvoltage protection of the PFC circuit, VVOSENSE >Vovp(VOSENSE),

only the PFC controller stops switching until the VOSENSE pin voltage drops below

Vovp(VOSENSE) again. Also, if a mains undervoltage is detected VVINSENSE <Vstop(VINSENSE),

only the PFC controller stops switching until VVINSENSE >Vstart(VINSENSE) again.

When the voltage on pin VCC drops below the undervoltage lockout level, both controllers

stop switching and reenter the safe restart mode. In the safe restart mode the driver

outputs are disabled and the VCC pin voltage is recharged via the HV pin.

SSL4101T Datasheet(PDF) 6 Page - NXP Semiconductors