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NXP Semiconductors
SSL1750
SMPS control IC for LED drivers
As soon as the ?yback converter is started, the voltage on pin FBCTRL is monitored. If the
output voltage of the ?yback converter does not reach its intended regulation level in a
prede?ned time, the voltage on pin FBCTRL reaches the V to(FBCTRL) level and an error is
assumed. The SSL1750 then initiates a safe restart.
When one of the protection functions is activated, both converters stop switching and the
V CC voltage drops to V th(UVLO) . A latched protection recharges the V CC capacitor via pin
HV, but does not restart the converters. For a safe restart protection, the capacitor is
recharged via pin HV and the device restarts (see Figure 1 ).
In the event of an overvoltage protection of the PFC circuit
(V I on pin VOSENSE > V ovp(VOSENSE) ), only the PFC controller stops switching until the
voltage on pin VOSENSE drops below V ovp(VOSENSE) again. Also, if a mains undervoltage
is detected (V I on pin VINSENSE < V stop(VINSENSE) ), only the PFC controller stops
switching until V I on pin VINSENSE > V start(VINSENSE) again.
When the voltage on pin V CC drops below the undervoltage lockout level, both controllers
stop switching and reenter the safe restart mode. In the safe restart mode the driver
outputs are disabled and pin V CC voltage is recharged via pin HV.
SSL1750_1
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 September 2008
7 of 29
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相关代理商/技术参数
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SSL1D03BD 制造商:Schneider Electric 功能描述:SSR Slim 1 Channel, 3.5A@1-24VDC, 15-30VDC
SSL1D03JD 制造商:Schneider Electric 功能描述:SSR Slim 1 Channel, 3.5A@1-24VDC, 3-12VDC
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SSL1D101JD 制造商:Schneider Electric 功能描述:SSR Slim 1 Channel, 0.1A@1-48VDC, 3-12VDC
SSL1D101ND 制造商:Schneider Electric 功能描述:SSR Slim 1 Channel, 0.1A@1-48VDC, 38-72VDC