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NXP Semiconductors
SSL1623PH
SMPS IC for mains LED drivers
8.6.4 Overvoltage protection
Overvoltage protection can be achieved in the application by pulling pin REG above its
normal operation level or by keeping the level of pin AUX above V det(demag) . The current
primary stroke is terminated immediately and no new primary stroke is started until the
voltage on pin REG drops to its normal operation level. Pin REG has an internal clamp.
The current feed into pin REG must be limited.
8.7 Characteristics of the complete LED power supply
8.7.1 Input
The input voltage range comprises the universal AC mains from 80 V to 276 V.
8.7.2 Accuracy
The accuracy of the complete converter, functioning as a voltage source with primary
sensing, is approximately 8 % (mainly dependent on the transformer coupling). The
accuracy with secondary sensing is defined by the accuracy of the external components.
For safety requirements in case of optocoupler feedback loss, the primary sensing
remains active when an overvoltage circuit is connected.
8.7.3 Efficiency
An efficiency of over 80 % at maximum output power can be achieved for a complete
converter designed for universal mains.
8.7.4 Ripple
A minimum ripple is obtained in a system designed for a maximum duty factor of 50 %
under normal operating conditions and a minimized dead time. The magnitude of the
ripple in the output voltage is determined by the frequency and duty factor of the
converter, the output current level, and the value and Equivalent Series Resistance ( ESR) of
the output capacitor.
9. Limiting values
Table 4.        Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
Conditions
Min
Max
Unit
Voltage
V CC
V RC
V SOURCE
V DRAIN
supply voltage
voltage on pin RC
voltage on pin SOURCE
voltage on pin DRAIN
continuous
[1]
[1]
? 0.4
? 0.4
? 0.4
? 0.4
+40
+3
+5
+650
V
V
V
V
Current
I REG
I AUX
I ch
I source
I DRAIN
current on pin REG
current on pin AUX
charge current
source current
current on pin DRAIN
oscillator capacitor
[2]
[2]
-
? 10
? 3
? 2
? 2
6
+5
-
+2
+2
mA
mA
mA
A
A
SSL1623PH
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 02 — 13 September 2010
? NXP B.V. 2010. All rights reserved.
8 of 18
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