SSL8516T datasheet(5/33 Pages) NXP

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SSL8516T

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Product data sheet

Rev. 1 — 5 May 2014

5 of 33

NXP Semiconductors

SSL8516T

Greenchip PFC and flyback controller

Functional description

7.1 General control

The SSL8516T contains a power factor correction circuit controller and a flyback circuit

controller. A typical configuration is shown in Figure 3.

7.1.1 Start-up and UnderVoltage LockOut (UVLO)

Initially, the capacitor on the VCC pin is charged from the high-voltage mains using the HV

pin.

When VCC is less than Vtrip, the charge current is Ich(low). This low current protects the IC if

the VCC pin is shorted to ground. To ensure a short start-up time, the charge current above

the Vtrip level is increased to Ich(high), until VCC reaches Vstartup. Except during start-up,

when VCC is between Vth(UVLO) and Vstartup, the charge current becomes Ich(low) to ensure

a low safe restart duty cycle during fault conditions.

When VCC is lowered to 2 V, the IC is reset. During the next start-up, the charge current

between Vth(UVLO) and Vstartup is Ich(high).

(1) The HV pin can either be connected to the center tap of the flyback transformer or to the drain of MOSFET S2.

Fig 3.

A typical SSL8516T configuration

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