ssl1750 NXP Semiconductors, ssl1750 Datasheet - Page 7

• Manufacturer Part Number: ssl1750
• Description: Smps Control Ic For Led Drivers
• Manufacturer: NXP Semiconductors

NXP Semiconductors
SSL1750_1
Product data sheet
As soon as the flyback converter is started, the voltage on pin FBCTRL is monitored. If the
output voltage of the flyback converter does not reach its intended regulation level in a
predefined time, the voltage on pin FBCTRL reaches the V
assumed. The SSL1750 then initiates a safe restart.
When one of the protection functions is activated, both converters stop switching and the
V
HV, but does not restart the converters. For a safe restart protection, the capacitor is
recharged via pin HV and the device restarts (see
In the event of an overvoltage protection of the PFC circuit
(V
voltage on pin VOSENSE drops below V
is detected (V
switching until V
When the voltage on pin V
stop switching and reenter the safe restart mode. In the safe restart mode the driver
outputs are disabled and pin V
CC
I
on pin VOSENSE > V
voltage drops to V
I
on pin VINSENSE < V
I
on pin VINSENSE > V
Rev. 01 — 15 September 2008
th(UVLO)
ovp(VOSENSE)
CC
drops below the undervoltage lockout level, both controllers
. A latched protection recharges the V
CC
voltage is recharged via pin HV.
), only the PFC controller stops switching until the
stop(VINSENSE)
start(VINSENSE)
ovp(VOSENSE)
), only the PFC controller stops
Figure
again. Also, if a mains undervoltage
again.
SMPS control IC for LED drivers
1).
to(FBCTRL)
CC
level and an error is
SSL1750
© NXP B.V. 2008. All rights reserved.
capacitor via pin
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