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SSL4120 데이터시트(PDF) 7 Page - NXP Semiconductors

부품명 SSL4120
상세설명  Resonant power supply controller IC with PFC for LED lighting
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SSL4120
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 2 — 1 November 2012
7 of 48
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) =15V.
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).


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