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SP6687 Fiches technique(PDF) 5 Page - Sipex Corporation

No de pièce SP6687
Description  4 Channel Charge Pump White LED Driver
Download  12 Pages
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Fabricant  SIPEX [Sipex Corporation]
Site Internet  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP6687 Fiches technique(HTML) 5 Page - Sipex Corporation

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Date: 11/15/05
SP6687 4Channel Charge Pump White LED Driver
© Copyright 2005 Sipex Corporation
THEORY OF OPERATION
The SP6687 is a high efficiency charge pump white
LED driver. It provides 4 channels of low drop-out
voltage current source to regulate the current for 4
white LEDs.
For high efficiency, the SP6687
implements 3 modes of charge pump: x1/x1.5/x2
modes. An external RSET is used to set the current
level of the White LEDs. SP6687 has an input current
regulation circuit to reduce the input ripple.
Soft Start
The SP6687 includes a soft start circuit to limit the
inrush current at power on and mode switching. The
soft start circuit holds the input current level long
enough for output capacitor COUT to reach a desired
voltage level. When the soft start turns off, the SP6687
will not sink current spiking from VIN.
Mode Decision
The SP6687 uses a smart mode decision method to
select the working mode for maximum efficiency. The
mode decision circuit senses the output and LED
voltage for up/down selection.
Dimming Control
CTRL0, CTRL1 and CTRL2 are used to control the
on/off of correlated White LEDs. When an external
PWM signal is connected to the control pin, the
brightness of the white LEDs is adjusted by the duty
cycle.
The current flowing through White LEDs connected
to the SP6687 can be set by RSET. Every current that
flows through each respective White LED is 440
times greater than the current of RSET. The white LED
current can be estimated by following equation:
LED Current Setting
where VISET =1.1V, and RSET is the resistance con-
nected from ISET to GND.
Thermal Shutdown
The SP6687 provides a high current capability to drive
4 white LEDs. A thermal shutdown circuit is needed to
protect the chip from thermal damage. When the chip
reaches the shutdown temperature of 150ºC, the
thermal shutdown circuit turns off the chip to prevent
thermal accumulation in the chip.
Overvoltage Protection
SP6687 regulates the output voltage by controlling
the input current. When the output voltage reaches the
designated level, SP6687 reduces the input current.
Subsequently, the output voltage regulation also serves
as an overvoltage protection circuit.
Short Circuit Protection
A current limiting circuit is also included in the SP6687
for short circuit protection. Whenever the output
sources a dangerously high current, the current limit-
ing circuit takes over the output regulation circuit and
reduces the output current to an acceptable level.
ILED =440x (
VISET
RSET )
APPLICATION INFORMATION
Typical Application Circuit For 3-White LEDs
EN
CTRL0
CTRL1
CTRL2
C1P
C1N
C2P
C2N
GND
LED1
LED2
LED3
LED4
C1 1µF
C2 1µF
1
3
4
5
6
7
89
10
11
12
13
14
15
16
2
Li-ion
Battery
SP6687
VIN
VOUT
ISET
RSET
COUT
1µF
CIN
1µF
®


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