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PDF SD42560 Data sheet ( Hoja de datos )

Número de pieza SD42560
Descripción BUCK/BOOST/BUCK-BOOST LED DRIVER
Fabricantes Silan Microelectronics 
Logotipo Silan Microelectronics Logotipo



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No Preview Available ! SD42560 Hoja de datos, Descripción, Manual

SD42560_Datasheet
BUCK/BOOST/BUCK-BOOST LED DRIVER
DESCRIPTION
The SD42560 is PWM control LED driver in Buck/Boost/Buck-Boost
modes with thermal shutdown circuit, current limit circuit and PWM
dimming circuit. And good line regulation and load regulation are
available with wide voltage input.
The SD42560 adopts current mode control which provides fast
transient response, excellent constant current characteristic and
simple loop stabilization design. It has high efficiency: 96% for buck
mode, 83% for buck-boost mode and 95% for boost mode,
FEATURES
* 5~36V input voltage range
* Maximum 1A output current (Buck mode)
* 0.3Ω built-in power MOSFET
* PWM dimming function
* 280kHz fixed frequency
* Excellent constant current accuracy ±3%
* High efficiency up to 96%.
* Thermal shutdown
* Cycle-by-cycle over current protection
* Over voltage protection (boost/buck-boost mode)
APPLICATIONS
* MR16 LED spotlight
* LED illuminance
* LCD backlight illumination
* Automotive interior lighting
* Portable Multi Media Player
* Portable GPS device
ORDERING INFORMATION
Part No.
SD42560
SD42560TR
SD42560E
SD42560ETR
Package
SOP-8-225-1.27
SOP-8-225-1.27
ESOP-8-225-1.27
ESOP-8-225-1.27
Marking
SD42560
SD42560
SD42560E
SD42560E
Material
Pb free
Pb free
Pb free
Pb free
Packing
Tube
Tape & Reel
Tube
Tape & Reel
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV: 1.1 2010.10.20
Page 1 of 13

1 page




SD42560 pdf
SD42560_Datasheet
The minimum setup time of SD42560 PWM dimming is less than 20μS, and the maximum PWM dimming ratio
is up to 500:1. When high dimming ratio is needed, the dimming frequency is recommended 500Hz below; or
else the dimming frequency can be up to 2 KHz.
2. Output current setting
The output current is determined by the sense resistor and setting voltage. The sense voltage of difference of
VSENSEand VSENSE(Drop voltage on RS) is 100mV, and adjust the output current by adjusting the sense resistor
RS (refer to Typical Application Circuit).
IOUT
=
V VSENSE+
SENSE-
RS
3. Current limiting
SD42560 has internal current limiting function, and the voltage on COMP is clamped at about 1.9V, the output
current of the power MOSFET is limited at about 2.5A by current comparator.
4. Frequency jitter
SD42560 has internal frequency jitter function to improve the EMI performance of the system. The internal
frequency is hopping in a very small range to reduce the single frequency radiation which simplifies the EMI
design.
5. Output over voltage protection
With boost/buck-boost mode, the IC will still work if voltage on sense resistor RS is 0 when LED is open, and
the peak current will be increased to the limit. Voltage at SENSE+ will be continuously increased if there is no
protection and components will be damaged. With the over voltage protection, voltage at SENSE+ is monitored
by internal OVP module, and power MOSFET is off if it is higher than 40V to guarantee the safety.
COMPONENTS SELECTION
1. Input Capacitor Selection
The input capacitor provides the pulse current when the power MOSFET is on, and capacitor is charged when
the power MOSFET is off, so input voltage is kept. At the switch frequency, impedance of input capacitor should
be less than that of input source to avoid high-frequency switch current from input source. The input capacitor is
recommended to be larger than 10μF, which can reduce the peak current drawn from input source and the switch
noise. The input capacitor should be near to the input pin in real routing.
2. Output Capacitor Selection
Ripple current of LED can be reduced through decreasing the output voltage ripple by connected a capacitor to
LED in parallel, and the circuit becomes more stable, while this capacitor will not effect the operating frequency
and efficiency, but the start time will be longer by reducing the rising speed of the voltage on LED. The larger the
output capacitor is, the smaller the current ripple on LED is. It is recommend to adopt the capacitor of 2.2μF or
larger.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV: 1.1 2010.10.20
Page 5 of 13

5 Page





SD42560 arduino
PACKAGE OUTLINE
ESOP-8-225-1.27
SD42560_Datasheet
0.42±0.10
Plated-Thru Holes
(0.38Dia,0.76Pitch)
3.81
UNIT: mm
1.27TYP
TOP VIEW
5.0±0.5
0.51
1.27
RECOMMENDED LAND PATTERN
3.9±0.4
FRONT VIEW
0.15±0.10
2.2±0.3
SIDE VIEW
08°
0.41.27
DETAILA
BOTTOM VIEW
Note:
Please soldering together of PCB copper foil and pad which is at the bottom of ESOP package, and enlarge
copper foil on PCB for heat dissipation. Better for more plated-thru holes on PCB attached to PAD.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV: 1.1 2010.10.20
Page 11 of 13

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