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LM27951 数据表(PDF) 3 Page - Texas Instruments

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部件名 LM27951
功能描述  White LED Adaptive 1.5/1 Switched-Capacitor Current Driver
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM27951 数据表(HTML) 3 Page - Texas Instruments

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Die-Attach Pad: GND
VOUT
C1+
VIN
D3
D2
C2+
C1-
GND
C2-
EN
7
D1
8
ISET
2
D4
13
PWM
1
2
3
4
5
14
12
11
10
9
Die-Attach Pad: GND
VOUT
C2+
C1+
D4
D3
C1-
C2-
VIN
PWM
EN
8
ISET
13
GND
6
7
D2
D1
3
LM27951
www.ti.com
SNVS416C – NOVEMBER 2005 – REVISED FEBRUARY 2016
Product Folder Links: LM27951
Submit Documentation Feedback
Copyright © 2005–2016, Texas Instruments Incorporated
5 Pin Configuration and Functions
NHK Package
14-Pin WSON
Top View
NHK Package
14-Pin WSON
Bottom View
Pin Functions
PIN
TYPE
DESCRIPTION
NUMBER
NAME
1
C2+
Power
Flying capacitor C2 connection
2
VOUT
Power
Pre-regulated charge-pump output
3
C1+
Power
Flying capacitor C1 connection
4
D4
Output
Regulated current source output
5
D3
Output
Regulated current source output
6
D2
Output
Regulated current source output
7
D1
Output
Regulated current source output
8
ISET
Input
Current set input. Placing a resistor (RSET) between this pin and GND sets the LED
current for all the LEDs. LED current = 200 × (1.25 V / RSET).
9
EN
Input
Enable logic input pin. Logic low = shutdown; Logic high = enabled. There is a 150-k
(typical) resistor connected internally between the EN pin and GND.
10
PWM
Input
Current source modulation logic input pin. Logic low = Off; Logic high = On.
Applying a pulse width modulated (PWM) signal to this pin allows the regulated current
sources to be modulated without shutting down the internal charge pump and the VOUT
node.
11
VIN
Input
Input supply: 2.8 V to 5.5 V
12
C2-
Power
Flying capacitor C2 connection
13
GND
Ground
Power supply ground connection
14
C1-
Power
Flying capacitor C1 connection


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