|
|
PDF SP1821 Data sheet ( Hoja de datos )
| Número de pieza | SP1821 | |
| Descripción | Four Channels Constant Current LED Driver | |
| Fabricantes | SYNC POWER | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de SP1821 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
|
No Preview Available !
SP1821
Four Channels Constant Current LED Driver
DESCRIPTION
The SP1821 is a linear constant current driver designed
to drive multiple LEDs in series from a high input
voltage rail. The driver acts as a high current matched,
four-channel current source ensuring constant LED
current for a range of input voltages. The device can
drive up to 25mA load current per string with an
external resistor. The SP1821 can provide lowest cost
for various applications. Internal thermal protection
automatically turns off LED current to prevent
overheating. The dimming can be achieved by
controlling the ISET input or by feeding a PWM signal to
the EN pin. The device can be shut down by setting
Enable low.
APPLICATIONS
z MR16 and other decoration light source
z General reading lighting
z Display Backlight
z 12V Battery powered devices
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
2010/04/10 Ver.2
Page 1
1 page  
SP1821
Four Channels Constant Current LED Driver
PERFORMANCE CHARACTERISTICS (TA=25℃, unless otherwise specified.)
ILED vs. Vcc
27
24
21
18
15
12 ILED1(mA)
ILED2(mA)
9
ILED3(mA)
6 ILED4(mA)
3
0
10.5 11 11.5 12
Vcc(V)
Rset vs. ILED
24
22
20
18
16
14
12
10
8
6
4
2
0
20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Rset(KΩ)
APPLICATION INFORMATION
CIRCUIT DESCRIPTION
SP1821 is a four channels white-LED driver with matching current output. The matching current regulator has a
460:1 ratio between ILED and ISET. SP1821 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
SP1821 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
SP1821 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 * (1.3V/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.
2010/04/10 Ver.2
Page 5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet SP1821.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| SP1820 | Four Channels Constant Current LED Driver | SYNC POWER |
| SP1820S8RGB | Four Channels Constant Current LED Driver | SYNC POWER |
| SP1821 | Four Channels Constant Current LED Driver | SYNC POWER |
| SP1821S8RGB | Four Channels Constant Current LED Driver | SYNC POWER |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |