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PDF SP1820S8RGB Data sheet ( Hoja de datos )
| Número de pieza | SP1820S8RGB | |
| Descripción | Four Channels Constant Current LED Driver | |
| Fabricantes | SYNC POWER | |
| Logotipo |  |
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SP1820
Four Channels Constant Current LED Driver
DESCRIPTION
The SP1820 is a four channels constant current driver
white LED. The device can drive up to 20mA load
current per channel from single cell Lithium Ion battery.
SP1820 can provide lowest cost LED driver for various
applications. It does not require any external
components. Internal thermal protection automatically
adjusts LED current to prevent overheating.
APPLICATIONS
z Battery Powered Devices
z Digital Camera
z PDA, MP3/4
z GPS
z Mobile Phone
z Keyboard/Display Backlight
The dimming control can be achieved by feeding a
PWM or analog signal into the Iset pin. The device can
be shut down by Enable low.
FEATURES
z Low Cost LED Driver
z Constant Current Output
z Four Channels LED Driver Provides Matching
LED Current
z Low Quiescent Current
z Disconnects LEDs in Shutdown Mode
z Thermal Shut Down Protection
z Current Adjustable via external resistor
z Dimming Control thru either Enable or Iset
PIN CONFIGURATION(SOP – 8P)
PART MARKING
2009/04/20 Ver.2
Page 1
1 page  
SP1820
Four Channels Constant Current LED Driver
APPLICATION INFORMATION
CIRCUIT DESCRIPTION
SP1820 is a four channels white-LED driver with matching current output. The matching current regulator has a
460:1 ratio between ILED and ISET. SP1820 is capable to supply 25mA for each channel with proper selection of
external resistor. The design has a band gap regulator, voltage to current converter and mirror drivers.
THERMAL PROTECTION
SP1820 has a thermal comparator to shut down the device when the internal temperature reaches 150℃. It will
remain shut down until the temperature drops to 130℃.
ENABLE
SP1820 has an enable pin that is designed for TTL input. The device will be active at voltage high. This pin can
also be used to control the brightness of LED with a PWM signal. The brightness is proportional to the duty cycle
of the PWM signal. When duty cycle is zero, LEDs are turned off. For 50% duty cycle, it will result an average
ILED to be half the programmed LED current which is set by RSET.
ISET
The ISET Pin is a voltage input to set the current of LED. An external resistor is used to set the output current, as
approximated with the following equation:
RSET = 460 * (1.2V/ILED)
However, the RSET shall not be selected to exceed the maximum current delivery capability of the device, 25mA.
A PWM signal or analog signal can also be applied at ISET pin to control the LED brightness.
2009/04/20 Ver.2
Page 5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet SP1820S8RGB.PDF ] | |
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