SSL21101T/1,518 NXP Semiconductors, SSL21101T/1,518 Datasheet - Page 5

• Manufacturer Part Number: SSL21101T/1,518
• Description: LED Lighting Drivers SMPS 25.5V 1.4mA
• Manufacturer: NXP Semiconductors

Specifications of SSL21101T/1,518

• Rohs: yes
• Input Voltage: 13 V to 25.5 V
• Maximum Supply Current: 1.4 mA
• Mounting Style: SMD/SMT
• Package / Case: SO-14
• Factory Pack Quantity: 2500

NXP Semiconductors
SSL21101T
Product data sheet
8.1 True current source behavior
The LED current (I
Where:
The relationship between the LED current and pin ILEDREF can be calculated with
Equation
I
I
LED
LED
Fig 3.
•
•
•
•
N is the turn ratio of the transformer
I
2t
t
M
sw
=
=
is the peak current
sw
is the switching period
1
-- -
2
---------------------------------------------------------------- -
V
1 + 2 +3 = 1
V
1t
2t
3t
t
V
V
N: transformer turn ratio
V
Timing
2:
DD INTREGD
0.45

is the secondary stroke switching time
sw
DRAIN
M
i
out
: input voltage
: switching time
N
: peak voltage
sw
sw
sw

: output voltage
: primary stroke switching time
: secondary stroke switching time
: free running time


: voltage on pin DRAIN
V
I
All information provided in this document is subject to legal disclaimers.
N
M
DRAIN


LED
V
2t
------------ -
switching

primary
I ILEDREF
t
stroke
δ1t
) of a flyback converter can be calculated with

sw

time
sw
R
sw
Rev. 3 — 7 June 2012
SOURCE

secondary
switching
stroke
δ2t
time
sw
V
M
t
sw
V
i
+ NV
free running
GreenChip driver for LED lighting
δ3t
out
sw
SSL21101T
aaa-001586
V
Equation
i
© NXP B.V. 2012. All rights reserved.
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