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PDF IS32LT3180 Data sheet ( Hoja de datos )
| Número de pieza | IS32LT3180 | |
| Descripción | LINEAR CURRENT DRIVER | |
| Fabricantes | ISSI | |
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IS32LT3180
DUAL INTENSITY, LINEAR CURRENT DRIVER FOR RCL
Preliminary Information
December 2014
GENERAL DESCRIPTION
The IS32LT3180 is an eight channel linear current
regulator for automotive rear tail light applications such
as RCL (Rear Combination Lamps) and CHMSL
(Center High Mounted Stop Lamps). It is fully
programmable with two LED brightness levels for the
different intensity requirements of “stop” bright (DC
mode) and “tail” dim (PWM mode).
A logic level at the PWM pin is used to select between
the tail and stop output conditions. The stop condition
provides the highest intensity output, while the tail
condition utilizes an internally generated PWM signal
to reduce the intensity of the LEDs’ light output.
The sink current at the OUTx pins is easily set with a
single resistor at the STOP pin. A second resistor at
the TAIL pin sets the duty cycle of the internal PWM
oscillator for dimming (less bright) the LED output
when operating in the tail condition.
An external FET (optional) can be implemented for
operation with wide varying supply voltages.
The IS32LT3180 is offered in an eTSSOP-16 package.
FEATURES
Output current programmable from 10mA to
75mA
Tail duty cycle programmable from 1% to 95%
Linear voltage regulator to optimize consumption
on device
Low dropout voltage of 0.8V@35mA
Slew rate control on each output for better EMI
performance
PWM logic level input selects between full
brightness and PWM dimming levels
FAULT reporting
LED open/short circuit detection
Input overvoltage protection
STOP pin overcurrent protection
Thermal rollback of output current
Withstand 50V load dump
AEC-Q100 qualification (pending)
APPLICATIONS
Rear Combinational Lamp (RCL)
Center High Mount Stop Light (CHMSL)
Daytime running lamp
Fog lamps
Turn signal
TYPICAL APPLICATION CIRCUIT
TAIL
STOP
10k
10nF
1k
Q1
RGS 50
1k
220nF
CVCC
1F
R RSTOP
TAIL
3.09k 7.72k
0.1 F
3
ERC
2
VCC
6
FAULT
1
OUT1
5 IS32LT3180
PWM
9
7 OUT8
STOP
84
TAIL
FB
13
GND
VSTRING
RFB1
8.87k
RFB2
1k
Figure 1 Typical Application Circuit
Integrated Silicon Solution, Inc. – www.issi.com
Rev. 0A, 12/09/2014
1
1 page  
IS32LT3180
ABSOLUTE MAXIMUM RATINGS
VCC, ERC, PWM, FAULT, OUTx, FB
TAIL, STOP
OUTx current
Operating junction temperature, TJ
Storage temperature range, TSTG
Operating ambient temperature range, TJ = TA
Package thermal resistance (Junction to ambient), RθJA
Power dissipation, PD(MAX) (Note 2)
ESD (HBM)
ESD (CDM)
-0.3 to 50V
-0.3 to 5.5V
100mA
150°C
-55°C ~ +150°C
-40°C ~ +150°C
39.9W/°C
2.5W
2kV
750V
Note 1:
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only
and functional operation of the device at these or any other condition beyond those indicated in the operational sections of the specifications is
not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Note 2:
Detail information please refers to package thermal de-rating curve on Page 13.
ELECTRICAL CHARACTERISTICS
TJ = -40°C ~+150°C, VCC = 6V~16V, RSTOP =3.09kΩ, RTAIL =7.72kΩ. (Note 3)
Symbol
Parameter
Condition
ICC Input current
IOUT_MAX Maximum sink current
IOUTACC Sink current accuracy
IOUTx =35mA, VCC =16V, 8 channels
TJ = -40°C ~+125°C
TJ = +150°C (Note 5)
TJ = -40°C ~+125°C, VOUTx =1.2V
TJ = +150°C (Note 5)
IOUTx =35mA = (IOUT_MAX+IOUT_MIN)/2
VOUTx = 0.8V, TJ = -40°C ~+125°C
(Note 4, 6)
∆IOUT
IL
LR
VOVP
IOSB
IFSB
Current matching
1-2×IOUT/(IOUT_MAX+IOUT_MIN)
IOUTx =35mA, TJ = -40°C ~+125°C
TJ = +150°C (Note 5)
Current leakage
VOUTx =42V
Line regulation
6V< VCC <16V, 0.8V<VOUTx<3V
IOUTx = 35mA, 8 channels
TJ = -40°C ~+125°C (Note 6)
Overvoltage setback threshold @99%IOUTx
Overvoltage setback current VCC =20V
FAULT reporting of setback
current
VOC
VTH
VSCR
Open LED detection threshold
Output disable threshold
Short LED detection threshold
for reduced LED Current
RCS Current slew rate
IOUTx = 35mA, 10%~90%
TJ = -40°C ~+125°C
TJ = +150°C (Note 5)
Min. Typ. Max. Unit
6.0 8.0
mA
6.0
75
25
mA
-8 0 8 %
-5 0
5
%
±7
1 µA
0.6 3 mA
16 18.7 23
V
95 %IOUT
80 %IOUT
0.3 0.4 0.5
V
100 250 mV
3.2 3.6
4
V
5 20
mA/µs
10
Integrated Silicon Solution, Inc. – www.issi.com
Rev. 0A, 12/09/2014
5
5 Page 
IS32LT3180
THERMAL SHUTDOWN
If the die temperature exceeds the thermal shutdown
temperature of 160°C (Typ.) then the device is
shutdown, and the sink current is shut off for all
channels. After a thermal shutdown event, the die will
not try to restart until the temperature of the die has
reduced to less than 145°C (Typ.).
INPUT VOLTAGE OVER VOLTAGE DETECTION
Automotive battery systems have wide variations in
line supply voltage; depending on battery charge
status. Low dropout is a key attribute for providing
consistent LED light output at low line voltage. Unlike
adjustable regulator based constant current source
schemes where the set point resistor resides in the
load path, the IS32LT3180’s set point resistor lies
outside the LED load path, and aids in the low dropout
capability.
Current limit is employed during high voltage. During a
current limit event, the drive current is linearly reduced
to 70%×IOUT resulting in lower power dissipation on the
IC. This occurs during high battery voltage (VCC > 16V).
In this way the IS32LT3180 can operate in extreme
conditions and still provide a controlled level of light
output. The overvoltage condition is asserted on the
FAULT pin as the drive current reaches 80%×IOUT.
Reference Figure 15 and 16 for power limiting
behavior.
Figure 15 System Power
Low Drop-out
Only Voltage Effects
Constant Current Area
Overvoltage
Set Back
Thermal
Rollback
130°C(Typ.)
Thermal
Shutdown
160°C(Typ.)
Figure 16 IC Power
Voltage
OUTPUT CURRENT SLEW RATE CONTROL
To minimize the effects of EMI, the output current rise
and fall time is controlled. The slew rate control
circuitry is designed to control the rise time, 10% to
90% and fall time 90% to 10% at 5mA/µs (Typ.).
Integrated Silicon Solution, Inc. – www.issi.com
Rev. 0A, 12/09/2014
OPEN LED DETECTION
Each of the outputs of the IS32LT3180 is monitored for
an output voltage of less than 400mV (Typ.). If any of
the output voltages drops below the threshold voltage,
the fault register is triggered and the FAULT pin is
asserted.
During normal operation, it is possible that current may
still be flowing in the output LED string even if the
output voltage of the IC falls below the OC detect
threshold – for example, if the LED string remains intact,
but the supply voltage dips momentarily. In this case,
the FAULT pin would assert then de-assert when the
output voltage returns to the nominal value.
OUTPUT DISABLE DETECTION
As IS32LT3180 powers up, the device will check OUTx
pin of each channel to see if it is connected to GND. If
any channel is connected to GND (disable typical
threshold is 100mV), the fault diagnostic function will
ignore the fault of this channel. To prevent a trigger
fault assertion, when less than 8 channels are used,
the unused OUTx pins must be connected to GND to
disable these channels.
SHORT LED DETECTION
If there is a condition where some or all of the LEDs on
a channel become short circuited, the voltage on the
channel output can reach the supply voltage, and
therefore the power dissipation of that channel will
arise due to V*I thermal dissipation. In this case, the
device will automatically try to protect itself by quickly
lowering the current to 30%×IOUT if the voltage on the
channel output rises above 3.6V. The FAULT pin will
assert. If the voltage returns to the lower region, the
current in the output driver will return to the set value
and FAULT pin de-asserts.
Table 1 IOUT and FAULT State at Different PWM
6V< VCC <16V
PWM LED
Pin String
Normal
> 2.2V Open
Short
Normal
<0.7V Open
IOUT
100 1.08
RSTOP
0A
100 1.08 30%
RSTOP
100 1.08 DC
RSTOP
0A
FAULT
De-asserted
Asserted
Asserted
De-asserted
Asserted
Short 100 1.08 30% DC
RSTOP
DC = Duty cycle of PWM as set by RTAIL.
Asserted
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet IS32LT3180.PDF ] | |
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