AD8240 datasheet(3/12 Pages) AD

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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

5 V Reference = 5 V

VO Regulation1 at 25°C

VPLUS = 13 V to 27 V

−3

±1

VO Regulation2 -40°C to 125°C

VPLUS = 13 V to 27 V

−6

±2

IOUT3

RSHUNT = 0.4 Ω

500

VO Rise Time

IOUT = 250 mA, CM = 22 nF, CL = 47 nF

µs

VSENSE Gain

VSENSE Accuracy

−7

±3

VSENSE Output Impedance

kΩ

Base Drive

PWM Turn-On Threshold

3.5

PWM Turn-Off Threshold

1.4

VSENSE Latch-Off Threshold4

0.1

0.3

Latch-Off Delay5

µs

PWM Frequency Range

500

CLOAD Range

CL = 47 nF

−30

+30

Operating Current6

VPLUS > 13 V

360

µA

VPLUS Operating Range

Shutdown Current

PWM low

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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