SSL4120 datasheet(12/48 Pages) NXP

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SSL4120

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Product data sheet

Rev. 2 — 1 November 2012

12 of 48

NXP Semiconductors

SSL4120

Resonant power supply controller IC with PFC for LED lighting

7.5 IC protection

7.5.1 IC restart and shut-down

In addition to the protection functions influencing the PFC and HBC controller operation,

several protection functions are provided to disable both controllers. See the protection

overview in Section 7.9 for details on which protection functions trigger a restart or

protection shut-down.

• Restart

When the SSL4120 enters the Restart state, the PFC and HBC controllers are

switched off. After a period defined by the restart timer, the IC automatically restarts

following the normal start-up cycle.

• Protection shut-down

When the SSL4120 enters the Protection shut-down state, the PFC and HBC

controllers are switched off. The Protection shut-down state is latched, the IC does

not automatically start up again. It can be restarted by resetting the Protection

shut-down state in one of the following ways:

– lower VSUPIC and VSUPHV below their respective reset levels, Vrst(SUPIC) and

Vrst(SUPHV)

– using a fast shut-down reset (see Section 7.5.3).

– using the enable pin (see Section 7.4)

• Thermal hold

In the Thermal hold state, the PFC and HBC controllers are switched off. The Thermal

hold state remains active until the IC junction temperature drops to approximately

C below T

otp (see Section 7.5.6).

Fig 4.

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