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AS3649 Datasheet(PDF) 6 Page - ams AG

Part # AS3649
Description  2500mA High Current LED Flash Driver
PDF  39 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3649 Datasheet(HTML) 6 Page - ams AG

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AS3649
Datasheet - Electrical Character i s t ics
www.ams.com/AS3649
1.0-2
6 - 39
VILED_COMP
LED_OUT current source
voltage compliance
Minimum voltage between pin VOUT1/2 and LED_OUT1/
2 for operation of the current source with current_boost=0
230
mV
VILED_COMP
_BOOST
VILED_COMP with current_boost=1
290
mV
LLED_CONNECT
ION
LED connection inductance Represents a maximum connection length of 10cm (LED
connection and ground return path)
100
nH
Protection and Fault Detection Functions (see page 12)
VVOUTMAX
VVOUT overvoltage
protection
DCDC Converter Overvoltage Protection
5.0
5.3
5.6
V
ILIMIT
Current Limit for coil
LDCDC (Pin SW)
measured at 25% PWM
duty cycle
3
maximum 40000s lifetime
operation in overcurrent
limit
coil_peak=00b
2.25
2.5
2.75
A
coil_peak=01b
2.61
2.9
3.19
Default value
coil_peak (see page
23)=10b
3.0
3.3
3.63
coil_peak=11b
3.3
3.7
4.1
VLEDSHORT
Flash LED short circuit
detection voltage
Voltage measured between pins LED_OUT1,2 and GND
1.2
V
TOVTEMP
Overtemperature
Protection
Junction temperature
144
ºC
TOVTEMPHYS
T
Overtemperature
Hysteresis
5ºC
tFLASHTIMEO
UT
Flash Timeout Timer
Can be adjusted with register flash_timeout (page 26)
4
1124
ms
Accuracy
-7.5
+7.5
%
VUVLO
Undervoltage Lockout
Falling VVIN
2.25
2.4
2.5
V
Rising VVIN
VUVLO
+0.05
VUVLO
+0.1
VUVLO
+0.15
V
VIN_LOW_VOLTA
GE
Battery Low Voltage
Protection
Defined by vin_low_v - see Current Reduction by VIN
Measurements in Flash Mode and Diagnostic Pulse on
page 15
-2.5%
3.0-
3.47
+2.5%
V
Protection and Fault Detection Functions - NTC
INTC
NTC Current Source
Adjustable by ntc_current (page
25) in 40µA steps
Range
40
600
µA
I - accuracy
V(NTC) <= 1.7V
-7
+7
%
4
-5
+5
µA
VNTC_TH
Threshold for
overtemperature
If ntc_on (page 25)=1 and the voltage on NTC drops
below VNTC_TH, any flash/torch or pwm operation of
LED_OUT is stopped
1.0
V
ADC
Resolution
10
bits
Range
ADC input range; channel
selected by
adc_channel (page 27)
ADC Code
0
full
scale
NTC
0.0
2.2
V
VIN
0.0
5.5
V
TJUNC (AS3649 junction temperature)
see Table 6
ºC
Accuracy
ADC measurement
accuracy
NTC
-1.5
+1.5
% full
scale
TJUNC (-30ºC...150ºC)
-8
+8
ºC
TJUNC (0ºC...85ºC)
-5
+5
Table 3. Electrical Characteristics (Continued)
Symbol
Parameter
Condition
Min
Typ
Max
Unit



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