SSL21084T/1,118 데이터 시트보기 (PDF) - NXP Semiconductors.
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SSL21084T/1,118 Datasheet PDF : 25 Pages
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NXP Semiconductors
SSL2108X
Drivers for LED lighting
7.2 Pin description
Table 4. Pin description
Symbol
Pin (SO8)
SSL2108X
HV
1
SOURCE
2
VCC
3
NTC
4
GND
6, 7
DVDT
5
TONMAX
-
DRIVER
-
DRAIN
8
Pin (SO12)
SSL2108X
1
3
4
5
2,6,7,10,11
9
8
-
12
Description
high-voltage supply pin
low-side internal switch
supply voltage
LED temperature protection input
ground
AC supply pin
brownout protection timer input
driver output
high-side internal switch
8. Functional description
8.1 Introduction
The SSL2108X is a product range of ICs intended for retrofit small form factor SSL lamps.
They provide a controller/driver with internal high-voltage switch.
8.2 Converter operation
The converter in the SSL2108X is a Boundary Conduction Mode (BCM), peak current
controlled system. For the basic application diagram see Figure 4, for the waveforms see
Figure 5. This converter type operates at the boundary between continuous and
discontinuous mode. Energy is stored in inductor L each period that the switch is on. The
inductor current Il is zero when the internal MOSFET switch is switched on. Thereafter, the
amplitude of the current build-up in L is proportional to VIN VOUT and the time that the
internal MOSFET switch is on. When the internal MOSFET switch is switched off, the
current continues to flow through the freewheel diode and the output capacitor. The
current then falls at a rate proportional to the value of VOUT. The LED current ILED is
almost equal to half the peak switch current. A new cycle is started, as soon as the
inductor current Il is zero.
SSL2108X
Preliminary data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 9 September 2011
© NXP B.V. 2011. All rights reserved.
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