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SP7683 Fiches technique(PDF) 6 Page - Sipex Corporation

No de pièce SP7683
Description  Four Channel Charge Pump Regulator LED Driver
Download  8 Pages
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Fabricant  SIPEX [Sipex Corporation]
Site Internet  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP7683 Fiches technique(HTML) 6 Page - Sipex Corporation

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Date: 12/21/04
SP7683 Four Channel Charge Pump LED Driver
© Copyright 2004 Sipex Corporation
The Low Dropout Regulator
The low dropout regulator provides matched currents into four LEDs. The current in the LED can
be programmed by an external resistor connected between the V
OUT and
I
SET
pins.
I
LED = 200*(VOUT - 0.5)/RSET where the 200 is the Output Current Multiplying Ratio and 0.5 is ISET
voltage value.
Board Layout and Grounding
To obtain the best performance from the SP7683, a printed circuit board with ground plane is
required. High quality, low series resistance ceramic 0.1µF bypass capacitors should be used at
the V
IN and VOUT pins (pin 10 and 7). These capacitors and flying capacitors C1 and C2 must be
located as close to the part as possible. The traces connecting the pins to these capacitors should
be made as short and wide as possible.
CIRCUIT DESCRIPTION
R1
50k - 200k
GND
D5
D6
D7
R7
D8
R8
R6
R3
100k
LED_EN
U1
SP7683
R5
20
R4
270k
R9
100k
C1
1uF
C5
1uF
C4
1uF
C2
1uF
R2
1M
D1
D2
EN
Vin
D3
D4
C3
0.1uF
R1
50k - 200k
GND
D5
D6
D7
D8
R4
100k
LED_EN
U1
SP7683
R6
R5
270k
R7
100k
C1
1uF
C5
1uF
C4
1uF
C2
1uF
R3
1M
D1
D2
EN
Vin
D3
D4
C3
0.1uF
Q1
Q2
R8
R2
D9
D10
D11
D12
®
®
SP7683
1
2
7
4
6
5
3
9
8
12
13
10
11
14
15 16
®
®
SP7683
1
2
7
4
6
5
3
9
8
12
13
10
11
14
15 16


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