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SSL2109T Datasheet(PDF) 13 Page - NXP Semiconductors

Part No. SSL2109T
Description  GreenChip controller for LED lighting
Download  19 Pages
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo NXP - NXP Semiconductors

SSL2109T Datasheet(HTML) 13 Page - NXP Semiconductors

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SSL2109T
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 2 — 26 April 2012
13 of 19
NXP Semiconductors
SSL2109T
GreenChip controller for LED lighting
12. Application information
A LED driver with the SSL2109T is a buck converter operating in BCM, see Figure 6.
Capacitor C3 buffers the IC supply voltage, which is powered via the HV pin at start-up
and via C5 during normal operation. Sense resistors R4 and R5 converts the current
through MOSFET Q1 into a voltage on pin Source. The value of these resistors defines
the maximum primary peak current on MOSFET Q1, and thus the LED current. Resistor
R6 reduces the reverse current into the DRIVER pin. The DRAIN pin is connected with the
drain of Q1 for valley detection.
In the example shown in Figure 6, the NTC pin is used for temperature protection. The
temperature level is set by Negative Temperature Coefficient (NTC) resistor R3 and
capacitor C4 reduces noise on the NTC pin. Further information can be found in the
SSL2109T application note.
Fig 6.
A typical SSL2109T application
SSL2109
HV
U1
DRAIN
VCC
GND
NTC
DVDT
SOURCE
R3
NTC
100 kΩ
C4
1 nF
C6
10 μF
160 V
D2
BYV25G-600
C3
1 μF
16 V
DRIVER
aaa-001746
1
2
3
4
6
5
8
7
C2
3.3 μF
400 V
C1
2.2 μF
385 V
L1
1 mH
500 mA SL
RV1
varistor 275 V
R1
fuse
L
J6-1
J6-2
L
N
1
1
10 Ω
R2
D1
DBLS105G
1
3
4
2
U
N
R6
C5
100 Ω,1206
120 pF
1 kV
L2
2.1 mH
1000 mA
R5
1.5, 1 %
R4
2.2, 1 %
Q1
MOSFET N
J5-1
LED+
LED-
LED+
LED-
J5-2
1
1


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