SSL4120T datasheet(5/47 Pages) NXP

5 / 47 page

SSL4120T

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Objective data sheet

Rev. 1 — 21 June 2012

5 of 47

NXP Semiconductors

SSL4120T

Resonant power supply control IC with PFC

Functional description

7.1 Overview of IC modules

The functionality of the SSL4120T can be grouped as follows:

• Supply module:

Supply management for the IC; includes the restart and (latched) shut-down states

• Protection and restart timer:

Externally adjustable timer used for delayed protection and restart timing

• Enable input:

Control input for enabling and disabling the controllers; very low current consumption

when disabled

• PFC controller:

Controls and protects the power factor converter; generates a 400 V (DC) boost

voltage from the rectified AC mains input with a high power factor

• HBC controller:

Controls and protects the resonant converter; generates a regulated (mains isolated)

output voltage from the 400 V (DC) boost voltage

Figure 1 shows the block diagram of the SSL4120T. A typical application is illustrated in

Figure 19.

reference for high-side driver; input for half-bridge slope detection;

externally connected to half-bridge node HB between HBC MOSFETs (see

Figure 19)

n.c.

not connected; high-voltage spacer

SNSCURHBC 17

sense input for momentary HBC current; externally connected to resonant

current sense resistor

SGND

signal ground; reference (ground) for IC.

CFMIN

minimum frequency setting for HBC; externally connected to capacitor

RFMAX

maximum frequency setting for HBC; externally connected to resistor

SNSFB

sense input for output voltage regulation feedback; externally connected to

opto-coupler

SSHBC/EN

combined soft start timing of HBC and IC enable input; enabling of PFC or

PFC and HBC controllers; externally connected to soft start capacitor and

enable pull-down signal

RCPROT

protection timer setting for time-out and restart; externally connected to

resistor and capacitor

SNSBOOST

sense input for boost voltage; externally connected to resistive divided

boost voltage

Table 2.

Pin description …continued

Symbol

Description

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