SSL4120T Ver la hoja de datos (PDF) - NXP Semiconductors.

Número de pieza

componentes Descripción

Fabricante

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

7.2 Power supply

The SSL4120 contains several supply-related pins SUPIC, SUPREG, SUPHS and

SUPHV. These pins are described in Section 7.2.1 to Section 7.2.4

7.2.1 Low-voltage supply input (SUPIC pin)

The SUPIC pin is the main low-voltage supply input to the IC. All internal circuits are

supplied from this pin directly or indirectly using the SUPREG pin. The high-voltage circuit

however, is not supplied from the SUPIC pin. The SUPIC pin is connected externally to a

buffer capacitor CSUPIC. This buffer capacitor can be charged in several ways:

• from the internal high voltage start-up source

• from the HBC transformer auxiliary winding

• from the switching half-bridge node capacitive supply

• from an external DC supply, for example, a standby supply

The IC starts operating when voltage on the SUPIC pin reaches the start level, provided

the voltage on the SUPREG pin has also reached the start level. The start level depends

on the condition of the SUPHV pin:

• High voltage present on the SUPHV pin (VSUPHV > Vdet(SUPHV)).

In a stand-alone application this is the case because CSUPIC is initially charged from

the HV start-up source. The start level is Vstart(hvd)(SUPIC) = 22 V. The wide difference

between the start and stop (Vuvp(SUPIC)) levels allows sufficient energy to be drawn

from the SUPIC buffer capacitor until the output voltage stabilizes.

• Not connected or voltage not present on the SUPHV pin (VSUPHV < Vdet(SUPHV)).

When the SSL4120 is supplied from an external DC source, this is the case. The start

level is Vstart(nohvd)(SUPIC) = 17 V. The IC is supplied from the DC supply during

start-up. To minimize power dissipation, the DC supply to the SUPIC pin must be

higher than but close to Vuvp(SUPIC) = 15 V.

The IC stops operating when VSUPIC < Vuvp(SUPIC). This voltage is the SUPIC pin

UnderVoltage Protection (UVP) voltage (UVP-SUPIC; see Section 7.9). The PFC

controller stops switching immediately but the HBC controller continues operating until the

low-side MOSFET is active.

The current consumption depends on the state of the IC. The SSL4120 operating states

are described in Section 7.3.

• Disabled IC state

When the IC is disabled using the SSHBC/EN pin, the current consumption is very

low (Idism(SUPIC)).

• SUPIC charge, SUPREG charge, Thermal hold, Restart and Protection shut-down

states

Only a small section of the IC is active while CSUPIC and CSUPREG are charging during

a restart sequence before start-up or during shut-down after a protection function has

been activated. The PFC and HBC controllers are disabled. Current consumption is

limited to Iprotm(SUPIC).

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.

7 of 48

Share Link: