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PDF SD42525TR Data sheet ( Hoja de datos )

Número de pieza SD42525TR
Descripción HIGH-EFFICIENCY HYSTERESIS LED DRIVER
Fabricantes Silan Microelectronics 
Logotipo Silan Microelectronics Logotipo



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SD42525_Datasheet
32V/1A, HIGH-EFFICIENCY HYSTERESIS LED DRIVER WITH BUILT-IN
MOSFET
DESCRIPTION
SD42525 is a step-down constant current converter with
inductance current continuous-conduction mode, it is used for
driving LED or LEDs in series. The output current is adjustable
which is up to 1A in 6~32V input voltage range. LED whose
power is tens of watts can be driven by SD42525 with different
input voltages and peripheral elements. With built-in power
switch, average current of LED can be set through external
high-side current sensing. Analog dimming and wide range
PWM dimming are available through pin DIM and soft-start time
can be set by capacitor value which is connected between pin
DIM and ground.
It adopts two patent technologies: output current compensation
when input voltage varies and current limiting through
maximum duty factor when difference between input/output APPLICATIONS
voltages is small.
For SD42525, package of SOP-8-225, SOT-23-6L and SOT-
89-5L (no dimming) are available.
* Low-voltage LED spotlight, replacing
Halogen lamp
* Car-mounted LED lamp
FEATURES
* LED backup lamp
* LED signal lamp
* Few peripheral elements
* Built-in 36V power MOSFET
* Wide input voltage range: 6V~32V
* Maximum 1A output current
* Excellent output current accuracy: ±3%
* Multiplex pin DIM is used for chip switch, analog dimming
and PWM dimming.
* Soft start function
* LED open/short-circuit protection
* High efficiency up to 96%
* Output constant current which is adjustable
ORDERING INFORMATION
Part No.
SD42525
SD42525TR
SD42525ETR
SD42525KTR
Package
SOP-8-225-1.27
SOP-8-225-1.27
SOT-89-5L
SOT-23-6L
Marking
SD42525
SD42525
525E
525K
Material
Pb free
Pb free
Pb free
Pb free
Packing
Tube
Tape & Reel
Tape & Reel
Tape & Reel
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2010.12.13
Page 1 of 12

1 page




SD42525TR pdf
SD42525_Datasheet
IOUT
=
0.1* V ADJ
1.3 * RS
0.4VVDIM1.3V
When
1.3VVDIM7V,
LED
current
is
100%
of
IOUT
=
0.1
RS .
3. PWM dimming
Maximum LED current is decided by RS, and PWM dimming can be available through pin DIM, expressed
as below:
IOUT = 0.1* D
RS
0D100%, 1.3VVDIM6.5V
Where, D is the PWM duty factor.
LED current changes from 0%~100% of 0.1/RS and LED luminance is decided by PWM duty factor, for
example, if PWM duty factor is 30%, then the average LED current is 30% of 0.1/RS,. PWM dimming
frequency should be higher than 100HZ to avoid obvious flashing which can be realized by eyes.
Advantage of PWM dimming is dimming without changing (correlated color temperature) CCT. PWM
dimming frequency of SD42525 can be up to 20KHz.
4. Shutdown mode
When DIM voltage is lower than 0.25V, the system will be shutdown and it restarts when DIM voltage is
higher than 0.35V. Pin DIM can be floating during normal work.
5. Soft start
Proper capacitor is connected to pin DIM for rising slowly of DIM voltage, so LED current rises slowly for
soft start.
6. LED short-circuit protection
When LED is short-circuit, current through RS will be increased, if voltage drop on RS is higher than 115mV
(this is obtained according to the typical value), power MOSFET is off to guarantee the safety of IC and
peripheral elements.
7. Output current compensation
Because of the delay of internal comparator and all the system, output current will vary following change of
LED quantity or input voltage, and there is 10%~15% change in output current when the input voltage
range is 6~32V. Output current compensation is adopted to decrease current change within ±3% which is
caused by vary of input voltage.
8. Maximum duty factor setting
Duty factor in Hysteresis Loop Control mode is decided by input voltage and voltage drop on LED. Duty
factor will be increased to 100% when LED voltage drop value is close to input voltage, and output current
is much higher than the normal value. the maximum duty factor setting module is used for limiting the duty
factor not higher than 96% and for stable output current.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2010.12.13
Page 5 of 12

5 Page





SD42525TR arduino
PACKAGE OUTLINE(continued)
SOT-23-6L
SD42525_Datasheet
Unit: mm
HANDLING MOS DEVICES:
Electrostatic charges can exist in many things. All of our MOS devices are internally protected against
electrostatic discharge but they can be damaged if the following precautions are not taken:
Persons at a work bench should be earthed via a wrist strap.
Equipment cases should be earthed.
All tools used during assembly, including soldering tools and solder baths, must be earthed.
MOS devices should be packed for dispatch in antistatic/conductive containers.
Disclaimer:
Silan reserves the right to make changes to the information herein for the improvement of the design and
performance without further notice! Customers should obtain the latest relevant information before placing
orders and should verify that such information is complete and current.
All semiconductor products malfunction or fail with some probability under special conditions. When using
Silan products in system design or complete machine manufacturing, it is the responsibility of the buyer to
comply with the safety standards strictly and take essential measures to avoid situations in which a
malfunction or failure of such Silan products could cause loss of body injury or damage to property.
Silan will supply the best possible product for customers!
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2010.12.13
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