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Número de pieza | BL8587 | |
Descripción | High Efficiency 1x/1.5x Charge Pump 4-Channels LED Driver | |
Fabricantes | BELLING | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de BL8587 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
No Preview Available ! BL8587
High Efficiency 1×/1.5× Charge Pump 4-Channels LED Driver
DESCRIPTION
BL8587 is a low noise, high efficiency, and
constant frequency charge pump DC/DC
converter for white LED application. The
operation frequency is 1MHz.
BL8587 works in load switch (1×) and
fractional (1.5×) modes with four independent
control outputs, each channel can provide
20mA constant current precisely from a 2.8V
to 5.5V supply. Only two external 1µF and
two 0.47µF capacitors are required to build a
compact and low-cost power supply solution.
BL8587 uses EN pin for simple on/off control
and single wire serial pulse dimming in 16
steps. A low current shutdown feature
disconnects the load from VIN and reduces
quiescent current to less than 1µA.
FEATURES
• Input range: 2.8-5.5V
• ±1% LED current accuracy
• 20mA driver capacity each channel
• Auto 1×/1.5× mode switchover
• PWM dimming control
• Serial-pulse dimming control in linear 16
steps
• Short-circuit protection
• Thermal shutdown
• 1MHz constant switching frequency
• 3mm×3mm QFN package
APPLICATION
• Programmable Current Sinks
• White LED Backlighting
• Cell Phones and Smart phones
• PDAs, Digital Cameras, and Camcorders
• Color (RGB) Lighting
TYPICAL APPLICATION CIRCUIT
BL8587
www.belling.com.cn
1
1 page OPERATION WAVEFORMS
LED current
EN
BL8587
LED current
EN
Fig. 1 Startup from EN pin
Fig. 2 Shutdown from EN pin
Output voltage ripple
LED current
Input voltage ripple
Fig. 3 Operating at 1.5x mode with 100% brightness
Input current
Input voltage ripple
Output voltage ripple
Fig. 4 Operating at 1x mode with 100% brightness
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5
5 Page |
Páginas | Total 8 Páginas | |
PDF Descargar | [ Datasheet BL8587.PDF ] |
Número de pieza | Descripción | Fabricantes |
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