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LP5524 bảng dữ liệu(PDF) 4 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  Parallel LED Driver with PWM Brightness Control in Micro SMD Package
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LP5524 bảng dữ liệu(HTML) 4 Page - Texas Instruments

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LP5524
SNVS500 – JULY 2007
www.ti.com
Electrical Characteristics
(1) (2)
Limits in standard typeface are for TJ = 25°C. Limits in boldface type apply over the operating ambient temperature range (-
40°C < TA < +85°C). Unless otherwise noted, specifications apply to the LP5524 Block Diagram with: VIN = 3.6V, RISET = 32.4
k
Ω, CIN = 100 nF.
Symbol
Parameter
Condition
Min
Typ
Max
Units
IVIN
Shutdown Supply
ENA = ENB = 0V
0.2
1
µA
Current
Active Mode
ENA = ENB = H,
170
210
µA
Supply Current
ISET = open
IDX
Recommended
3
25
mA
LED Current
IOUT
LED Output
IDX = 5mA, VDX =
0.5
5
%
Current Accuracy
VIN - 0.2V
ISET = open
LED Output
IDX = 15.9mA, VDX
0.5
4
%
Current Accuracy
= VIN - 0.2V
IMATCH
LED Current
IDX = 15.9mA
0.4
2.5
%
Matching (3)
ΔIDX%/ΔVIN
Line Regulation
1
%/V
ΔIDX%/ΔVDX
Load Regulation
VDX < VIN - 0.2V
0.4
%/V
VHR
Minimum
IDX set to 5 mA
10
mV
Headroom
IDX set to 15 mA
30
75
mV
Voltage
(VIN - VDX)
(4)
IMIRROR
External RISET to
1:416
LED
Current Mirroring
Ratio
VISET
ISET Reference
1.237
V
Voltage
IISET
ISET Pin Current
2.5
62.5
µA
Range
tPWM MIN
Recommended
33
μs
Minimum
On Time For
PWM Signal
VIL
Logic Input Low
0.4
V
Level
VIH
Logic Input High
1.2
V
Level
IIN
CTRL Input
ENA / ENB = 1.2V
1.2
1.9
µA
Current
tSD
Shutdown Delay
Delay from ENA
20
25
µs
Time
and ENB = low to
IDX = 0.1 x IDX
nom
(1)
All voltages are with respect to the potential at the GND pin.
(2)
Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the
most likely norm.
(3)
Matching is the maximum difference from the average.
(4)
The current source is connected internally between VIN an VDX. The voltage across the current source, (VIN - VDX), is referred to a
Headroom Voltage (VHR). Minimum Headroom Voltage is defined as the VHR voltage when the LED current has dropped 20% from the
value measured at VDX = VIN - 1V.
4
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Copyright © 2007, Texas Instruments Incorporated
Product Folder Links: LP5524



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