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LM36923 数据表(PDF) 5 Page - Texas Instruments

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部件名 LM36923
功能描述  Highly Efficient Triple-String White LED Driver
Download  47 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM36923 数据表(HTML) 5 Page - Texas Instruments

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5
LM36923H
www.ti.com
SNVSAF3A – FEBRUARY 2016 – REVISED FEBRUARY 2016
Product Folder Links: LM36923H
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
(1)
LED Current Matching between strings is given as the worst case matching between any two strings. Matching is calculated as ((ILEDX
ILEDY)/(ILEDX + ILEDY)) × 100.
6.5 Electrical Characteristics
Minimum and maximum limits apply over the full operating ambient temperature range (
−40°C ≤ TA ≤ 85°C), typical values
are at TA = 25°C, and VIN = 3.6 V (unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
BOOST
IMATCH
(1)
LED current matching ILED1
to ILED2 to ILED3
50 µA
≤ ILED ≤ 25 mA, 2.7 V ≤ VIN ≤ 5 V (linear
or exponential mode)
–1%
0.1%
1%
Accuracy
Absolute accuracy (ILED1,
ILED2, ILED3)
50 µA
≤ ILED ≤ 25 mA, 2.7 V ≤ VIN ≤ 5 V (linear
or exponential mode)
–3%
0.1%
3%
ILED_MIN
Minimum LED current (per
string)
PWM or I2C current control (linear or
exponential mode)
50
µA
ILED_MAX
Maximum LED current (per
string)
25
mA
RDNL
IDAC ratio-metric DNL
exponential mode only
1/3
(0.3%)
LSB
VHR
Regulated current sink
headroom voltage
ILED = 25 mA
210
mV
ILED = 5 mA
100
VHR_MIN
Current sink minimum
headroom voltage
ILED = 95% of nominal, ILED = 5 mA
35
50
mV
Efficiency
Typical efficiency
VIN = 3.7 V, ILED = 5 mA/string, Typical
Application circuit (3x7 LEDs), (POUT/PIN)
87%
RNMOS
NMOS switch on resistance ISW = 250 mA
0.29
Ω
ICL
NMOS switch current limit
2.7 V
≤ VIN ≤ 5 V
OCP = 00
575
750
875
mA
OCP = 01
860
1000
1110
OCP = 10
1100
1250
1400
OCP = 11
1350
1500
1650
VOVP
Output overvoltage
protection
ON threshold, 2.7 V
≤ VIN ≤ 5 V
OVP = 00
16
17
17.5
V
OVP = 01
23
24
25
OVP = 10
30
31
32
OVP = 11
37
38
39
OVP
Hysteresis
0.5
V
ƒSW
Switching frequency
2.7 V
≤ VIN ≤ 5 V, boost
frequency
shift = 0
Boost
frequency
select = 0
475
500
525
kHz
Boost
frequency
select = 1
950
1000
1050
DMAX
Maximum boost duty cycle
92%
94%
ISHDN
Shutdown current
Chip enable bit = 0, SDA = SCL = IN or GND,
2.7 V
≤ VIN ≤ 5 V
1.2
5
µA
TSD
Thermal shutdown
135
°C
Hysteresis
15
PWM INPUT
Min ƒPWM
50
Hz
Max ƒPWM
Sample rate = 24 MHz
50
kHz
tMIN_ON
Minimum pulse ON time
Sample rate = 24 MHz
183.3
ns
Sample rate = 4 MHz
1100
Sample rate = 800 kHz
5500
tMIN_OFF
Minimum pulse OFF time
Sample rate = 24 MHz
183.3
ns
Sample rate = 4 MHz
1100
Sample rate = 800 kHz
5500


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