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AS3492 Datasheet(PDF) 5 Page - ams AG

Part # AS3492
Description  Highly Efficient 2-10 LEDs Backlight Driver with 2 PWM Inputs
PDF  19 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3492 Datasheet(HTML) 5 Page - ams AG

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AS3492
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
VVIN = +2.5V to +5.5V, TAMB = -30ºC to +85ºC, unless otherwise specified. Typical values are at VVIN = +3.7V, TAMB =
+25ºC, unless otherwise specified.
Table 3. Electrical Characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Unit
General Operating Conditions
VVIN
Supply Voltage
2.5
3.7
5.5
V
VVIN_REDUC
ED
Supply Voltage
reduced performance
not all parameters within specification
2.3
V
ISHUTDOWN
Shutdown Current
ON13=0V, ON45=0V
0.5
2.0
µA
IVIN
Operating Current
no load, PWM Normal mode
250
µA
TAMB
Operating
Temperature
-30
25
85
ºC
DCDC Converter parameters
VVOUT
Output Voltage VOUT
automatically regulated
VVIN+
0.3V
VVOUT
_MAX
V
all other conditions with ON13=ON45
140
VVOUT_RIPP
LE_PWM
Voltage VOUT due to
PWM signal
identical signal for ON13 and ON45; DCDC not
in pulseskip or current limit
70
mV
ILOAD
Load current
VOUT<7.5V
0.0
100
mA
Overall Efficiency
VVIN=3.7V, TAMB = +25ºC,
LED mismatch <= 30mV,
VLED=3.0V
ILOAD=50mA
86
%
ILOAD=75mA
85
86
ILOAD=100mA
86
fCLK
Operating Frequency
All internal timings are derived from this
oscillator
-10%
2.0
+10%
MHz
tMIN_ON
Minimum on-time
60
ns
MDC
Maximum Duty Cycle
90
%
RSW_P
DCDC Switch
SW - VOUT
0.5
RSW_N
DCDC Switch
SW - GND
0.5
Output voltage soft start
tVOUT_START
softstart time
measured from first high signal on ON13 or
ON45
1.2
ms
VVOUT_
START
VOUT startup voltage
7.0
V
tPWM_START
_MAX
Startup with PWM
Maximum duration between PWM pulses
during startup; see Figure 17 on page 11
10
11
12
ms
tTIMEOUT
DCDC timeout time
if ON13 and ON45=0 for tTIMEOUT, the DCDC is
stopped and the AS3492 enters shutdown
29
48
ms
Current Sources
VLED1..5
LED1...LED5 output
voltage range
2.6
x2
3.3
x2
3.9
x2
V
ILED1..5
LED1...LED5 output
current range
0.0
25.0
mA
ILED1..5
LED1...LED5 current
source accuracy
1
ILED1..5 =20mA
-7.5
+7.5
%



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