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LM2794 데이터시트(PDF) 2 Page - Texas Instruments

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부품명 LM2794
상세설명  LM2794 /LM2795 Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control
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LM2794 데이터시트(HTML) 2 Page - Texas Instruments

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A1
B2
C1
D2
E1
E3
E5
E7
D6
C7
B6
A7
A5
A3
LM2794, LM2795
SNVS168L – JANUARY 2002 – REVISED MAY 2013
www.ti.com
DESCRIPTION (CONTINUED)
Brightness can be controlled by both linear and PWM techniques. A voltage between 0V and 3.0V may be
applied to the BRGT pin to linearly vary the LED current. Alternatively, a PWM signal can be applied to the SD
pin to vary the perceived brightness of the LED. The SD pin reduces the operating current to 2.3µA (typ.) The
LM2794 is shut down when the SD pin is low, and the LM2795 is shut down when the SD pin is high.
The LM2794/95 is available in a DSBGA CSP package.
Connection Diagram
Figure 1. DSBGA Package
Bottom View
PIN DESCRIPTION
Pin(1)
Name
Function
A1
C1+
Positive terminal of C1
B2
C1
Negative terminal of C1
C1
VIN
Power supply voltage input
D2
GND
Power supply ground input
E1
C2
Negative terminal of C2
E3,E5,E7,D6
D1
−4
Current source outputs. Connect directly to LED
C7
ISET
Current Sense Input. Connect 1% resistor to ground to set constant current through LED
B6
BRGT
Variable voltage input controls output current
A7
SD
The LM2794 has an active-low shutdown pin (LOW = shutdown, HIGH = operating). The LM2795
has an active-high shutdown pin (HIGH = shutdown, LOW = operating) that has a pull-up to VIN.
A5
C2+
Positive terminal of C2
A3
POUT
Charge pump output
(1)
Note that the pin numbering scheme for the DSBGA package was revised in April, 2002 to conform to JEDEC standard. Only the pin
numbers were revised. No changes to the physical location of the inputs/outputs were made. For reference purpose, the obsolete
numbering had C1+ as pin 1, C1- as pin 2, VIN as pin 3, GND as pin 4, C2- as pin 5, D1-D4 as pin 6,7,8 & 9, Iset as pin 10, BRGT as
pin 11, SD as pin 12, C2+ as pin 13, Pout as pin 14
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2
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Copyright © 2002–2013, Texas Instruments Incorporated
Product Folder Links: LM2794 LM2795


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