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AD8240 Datasheet(PDF) 3 Page - Analog Devices

Part # AD8240
Description  LED Driver/Monitor
Download  12 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8240 Datasheet(HTML) 3 Page - Analog Devices

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AD8240
Rev. 0 | Page 3 of 12
SPECIFICATIONS
TA = operating temperature range, VPLUS = 13.5 V, unless otherwise noted.
Table 1.
Parameter
Conditions
Min
Typ
Max
Unit
VO
5 V Reference = 5 V
12
V
VO Regulation1 at 25°C
VPLUS = 13 V to 27 V
−3
±1
+3
%
VO Regulation2 -40°C to 125°C
VPLUS = 13 V to 27 V
−6
±2
+6
%
IOUT3
RSHUNT = 0.4 Ω
500
mA
VO Rise Time
IOUT = 250 mA, CM = 22 nF, CL = 47 nF
12
µs
VSENSE Gain
24
VSENSE Accuracy
−7
±3
+7
%
VSENSE Output Impedance
8
10
12
kΩ
Base Drive
15
mA
PWM Turn-On Threshold
3.5
V
PWM Turn-Off Threshold
1.4
V
VSENSE Latch-Off Threshold4
0
0.1
0.3
V
Latch-Off Delay5
2
µs
PWM Frequency Range
DC
500
Hz
CM
22
nF
CLOAD Range
CL = 47 nF
−30
+30
%
Operating Current6
VPLUS > 13 V
360
µA
VPLUS Operating Range
9
27
V
Shutdown Current
PWM low
10
µA
5 V Reference Current
160
200
240
µA
Operating Temperature Range
−40
+125
°C
1 VO = 12/5 of the applied reference voltage ±1% typical. Minimum VPLUS voltage for regulation depends on the external transistor Vbe and the shunt voltage.
2 VO = 12/5 of the applied reference voltage ±2% typical. Minimum VPLUS voltage for regulation depends on the external transistor Vbe and the shunt voltage.
3 The maximum output current level is set by the selection of the current shunt and power transistor.
4 (VSENSE – 5 V Reference) The latch-off level is determined by the output level of the sense amplifier. When the amplifier output approaches 5 V, the output is latched off.
This allows the maximum current output level to be determined by the shunt resistor value. Latch-off can be restored to on by cycling the PWM input off and back on.
5 Internal delay only. The external delay depends on the external capacitor values, LED string impedance, and wiring inductance.
6 This specifies VPLUS only—ground current includes external transistor base drive.


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