SSL21101T/1,518 NXP Semiconductors, SSL21101T/1,518 Datasheet - Page 6

• 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
8.2 Leading-Edge Blanking (LEB)
8.3 dV/dt detection
8.4 Secondary stroke switching time (2t
8.5 Mains sensing
Where:
The true current source behavior and the LED current accuracy are achieved using an
internal digital control. The internal digital control compares the ILEDREF pin reference
with the measurement of the average LED current over a half-main cycle. The primary
peak current (I
The expected primary peak current value on the application can be calculated with
Equation
Where:
The controller automatically adjusts LEB to avoid wrong detection of the primary peak
current.
A dV/dt detector block is used on pin DRAIN to detect the end of demagnetization and
possible valleys accurately. A valley switching concept is used for efficiency purposes.
A blanking time (t
demagnetization.
2t
For example, for a 100 kHz switching frequency the application design must provide a
typical secondary stroke switching time (2t
Pin RMAIN senses the mains voltage (V
mains current (I
I
I
M
main
•
•
•
•
•
sw
=
V
V
R
V
R
I(ILEDREF)
DD(INTREGD)
th(det)SOURCE
SOURCE
SOURCE
must have a value that allows the application to run in DCM mode.
=
V
------------------------------------ -
th det
V
-------------------------- -
R

3:
main
R
SOURCE
RMAIN
SOURCE
is the resistor connected to pin SOURCE of the power MOS transistor.
is the resistor connected to pin SOURCE of the power MOS transistor

M
is the voltage defined at the input of pin ILEDREF
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main
) is adjusted at each half-main cycle to achieve the expected LED current.
is the internal regulated voltage
blank
2
is the detection threshold voltage on pin SOURCE
in
) is applied at the beginning of 2t
Equation
Rev. 3 — 7 June 2012
4):
main
sw
in
) ranging from 4 s to 6 s.
Equation
sw
)
GreenChip driver for LED lighting
sw
4) in real time and transforms it to
before observing the
SSL21101T
© NXP B.V. 2012. All rights reserved.
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