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SSL4120T

Resonant power supply controller IC with PFC for LED lighting

NXP Semiconductors. 

NXP Semiconductors

SSL4120

Resonant power supply controller IC with PFC for LED lighting

Table 3. Operating states

State

Description

No supply

Disabled IC

Supply voltages on the SUPIC and SUPHV pins are too low to provide

any functionality. Undervoltage protection (UVP supplies; see

Section 7.9) is active when VSUPHV < Vrst(SUPHV) and

VSUPIC < Vrst(SUPIC). The IC is reset.

The IC is disabled because the SSHBC/EN pin is LOW.

Thermal hold

Activated when OTP is active. The IC is not operating. The PFC and

HBC controllers are disabled and CSUPIC and CSUPREG are not

charged.

SUPIC charge

SUPREG charge

Boost charge

Operational supply

The HV start-up source charges the IC supply capacitor (CSUPIC).

CSUPREG is not charged.

The series regulator charges the stabilized supply capacitor

(CSUPREG).

The operational PFC builds up Vboost.

The output voltage is generated. Both the PFC and HBC controllers

are fully operational.

Restart

Protection shut-down

Activated when a protection function is triggered. The restart timer is

activated. During this time, both the PFC/HBC controllers are disabled

and CSUPREG is not charged. CSUPIC is charged.

Activated when a protection function is triggered. The IC is not

operational. The PFC and HBC controllers are disabled and

CSUPIC/CSUPREG are not charged.

7.4 Enable input (SSHBC/EN pin)

The power supply application is disabled by pulling the SSHBC/EN pin LOW.

Figure 4 shows the internal functionality. When a voltage is present on the SUPHV pin or

on the SUPIC pin, a current Ipu(EN) = 42 A flows from the SSHBC/EN pin. If the pin is not

pulled down, the current increases the voltage up to Vpu(EN) = 3 V. Since the voltage is

above both Ven(PFC)(EN) = 1.2 V and Ven(IC)(EN) = 2.2 V, the IC is enabled.

The IC is disabled when the SSHBC/EN pin voltage is pulled down under Ven(PFC)(EN) and

Ven(IC)(EN) via an optocoupler driven from the HBC transformer secondary side (see

Figure 4). The PFC controller stops switching immediately but the HBC controller

continues switching until the low-side stroke is active. It is also possible to control the

voltage on the SSHBC/EN pin from another circuit on the secondary side via a diode. The

external pull-down current must be larger than the internal soft-start charge current

Iss(hf)(SSHBC).

If the voltage on SSHBC/EN is pulled under Ven(IC)(EN), but not under Ven(PFC)(EN), only the

HBC is disabled. This feature is useful when another power converter is connected to the

PFC Vboost.

The low-side power switch of the HBC is on when the HBC is disabled using the

SSHBC/EN pin.

SSL4120

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 2.1 — 18 February 2014

© NXP B.V. 2014. All rights reserved.

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