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LT3932 Datenblatt(PDF) 4 Page - Linear Technology

Teilenummer LT3932
Bauteilbeschribung  36V, 2A Synchronous Step-Down LED Driver
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Hersteller  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3932 Datenblatt(HTML) 4 Page - Linear Technology

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LT3932/LT3932-1
4
3932fa
For more information www.linear.com/LT3932
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Do not apply a positive or negative voltage source to these pins,
otherwise permanent damage may occur.
Note 3: The LT3932E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the −40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3932I is guaranteed to meet performance specifications over the
−40°C to 125°C operating junction temperature range. The LT3932H is
guaranteed over the −40°C to 150°C operating junction temperature range.
Operating lifetime is derated for junction temperatures greater than 125°C.
Note 4: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
Note 5: The current sense error amplifier is tested with VISP = 36V, and
separately, with VISN = 0V.
Note 6: The MIN on and off times are guaranteed by design and are not
tested.
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
SS Pin Discharging Current
VSS = 2V
1.25
µA
SS Lower Threshold (Falling)
200
mV
SS Higher Threshold (Rising)
1.7
V
Fault Detection
Open-Circuit Threshold (FB Rising)
l
930
950
970
mV
Open-Circuit Falling Hysteresis
55
mV
Short-Circuit Threshold (FB Falling)
l
180
200
220
mV
Short-Circuit Rising Hysteresis
50
mV
FAULT Pull-Down Current
VFAULT = 200mV, VFB = 0V
100
µA
FAULT Leakage Current
VFAULT = 3.3V, VFB = 700mV
−100
100
nA
Overvoltage Protection
FB Overvoltage Threshold (FB Rising)
1.050
V
FB Overvoltage Falling Hysteresis
48
mV
LED Current Monitor
ISMON Voltage
VISP − VISN = 100mV (100%), VISP = 12V
VISP − VISN = 10mV (10%), VISP = 12V
0.965
80
1.000
100
1.030
120
V
mV
PWM Driver
PWMTG Gate Drive (VOUT – VPWMTG)
VOUT = 12V, VPWM = 2V
l
10
11
V
PWM Threshold (Rising)
VOUT = 12V
1.4
V
PWM Falling Hysteresis
VOUT = 12V
200
mV
PWM Pin Current
VPWM = 2V
−100
100
nA
PWM to PWMTG Propagation Delay
Turn-On
Turn-Off
CPWMTG = 2.2nF (Connected from VOUT to PWMTG),
VOUT = 12V
100
100
ns
ns
Analog Control for PWM Dimming
PWM Voltage for 100% Dimming
RP = 28.7k, VREF = 2V
2.00
V
PWM Voltage for 0% Dimming
RP = 28.7k, VREF = 2V
0.99
V
PWM Dimming Accuracy
RP = 28.7k, VREF = 2V, VPWM = 1.1V
RP = 28.7k, VREF = 2V, VPWM = 1.9V
l
l
7.8
87
10
90
12.4
93
%
%
PWM Dimming Frequency
RP = 28.7k, RT = 45.3k, VSYNC/SPRD = 0V
RP = 332k, RT = 45.3k, VSYNC/SPRD = 0V
7.42
116
7.81
122
8.20
128
kHz
Hz
RP Pin Current Limit
RP = 0V, Current Out of Pin
60
µA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VEN/UVLO = 5V unless otherwise noted.


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