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LM27951 Datasheet(PDF) 5 Page - Texas Instruments

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No. de pieza LM27951
Descripción Electrónicos  White LED Adaptive 1.5/1 Switched-Capacitor Current Driver
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LM27951 Datasheet(HTML) 5 Page - Texas Instruments

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LM27951
www.ti.com
SNVS416C – NOVEMBER 2005 – REVISED FEBRUARY 2016
Product Folder Links: LM27951
Submit Documentation Feedback
Copyright © 2005–2016, Texas Instruments Incorporated
(1)
All voltages are with respect to the potential at the GND pin.
(2)
CIN, COUT, C1, C2: Low-ESR surface-mount ceramic capacitors (MLCCs) used in setting electrical characteristics.
(3)
LED current matching is based on two calculations: [(IMAX – IAVG) / IAVG] and [(IAVG – IMIN) / IAVG]. IMAX and IMIN are the highest and
lowest respective Dx currents, and IAVG is the average Dx current of all four current sources. The largest number of the two calculations
(worst case) is considered the matching figure for the part. The typical specification provided is the most likely norm of the matching
figure for all parts.
(4)
Headroom voltage (VHR) = VOUT − VDX. If headroom voltage requirement is not met, LED current regulation may be compromised.
(5)
EN logic input high current (IIH) is due to a 150-kΩ (typical) pulldown resistor connected internally between the EN and GND pins.
(6)
The open-loop output resistance (ROUT) models all voltage losses in the charge pump. ROUT can be used to estimate the voltage at the
charge pump output VOUT and the maximum current capability of the device under low VIN and high IOUT conditions, beyond what is
specified in the electrical specifications table: VOUT = (G × VIN) – (ROUT × IOUT). In the equation, G is the charge-pump-gain mode, and
IOUT is the total output current (sum of all active Dx current sources and all current drawn from VOUT).
6.5 Electrical Characteristics
Unless otherwise noted, typical limits are for TA = 25°C, and minimum and maximum limits apply over the full operating
temperature (–40°C to +85°C); specifications apply to the Simplified Schematic with VIN = 3.6 V, V(EN) = 1.8 V, V(PWM) =
1.8 V, 4 LEDs, VDX = 3.6 V, CIN = COUT = 3.3 µF, C1 = C2 = 1 µF, RSET = 12.5 kΩ
(1) (2).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
IDX
LED current regulation
3 V
≤ VIN ≤ 5.5 V
RSET = 12.5 kΩ
IVOUT = 0 mA
18.4
(
−8%)
20
21.6
(8%)
mA
3 V
≤ VIN ≤ 5.5 V
RSET = 8.32 kΩ
IVOUT = 0 mA
30
3 V
≤ VIN ≤ 5.5 V
RSET = 24.9 kΩ
IVOUT = 0 mA
10
ID-MATCH
LED current matching(3)
RSET = 8.32 kΩ
0.2
1.5%
IQ
Quiescent supply current
D(1-4) = OPEN
RSET = OPEN
1.5
1.9
mA
ISD
Shutdown supply current
3 V
≤ VIN ≤ 5.5 V
V(EN) = 0 V
0.1
1
µA
VSET
ISET pin voltage
3 V
≤ VIN ≤ 5.5 V
1.25
V
IDX / ISET
Output current to current set
ratio
200
VHR
Current source voltage
headroom requirement(4)
IDX = 95% IDX (nominal)
RSET = 8.32 kΩ
(IDX nominal = 30 mA)
360
mV
IDX = 95% IDX (nom.)
RSET = 12.5 kΩ
(IDX nom. = 20 mA)
240
fSW
Switching frequency
525
(–30%)
750
975
(30%)
kHz
VIH
Logic input high
Input pins: EN, PWM
3 V
≤ VIN ≤ 5.5 V
1
VIN
V
VIL
Logic input low
Input pins: EN, PWM
3 V
≤ VIN ≤ 5.5 V
0
0.4
IIH
Logic input high current
Input pin: PWM
V(PWM) = 1.8 V
10
nA
Input pin: EN
V(EN) = 1.8 V(5)
12
µA
IIL
Logic input low current
Input pins: EN, PWM
V(EN, PWM) = 0 V
10
nA
ROUT
Charge pump output
resistance (6)
3.3
VGDX
1× to 3/2× gain transition
voltage threshold on VDX
(VOUT − VDX) Falling
500
mV
tON
Start-up time
IDX = 90% steady state
330
µs


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