FAN5640S7X datasheet(2/11 Pages) FAIRCHILD

номер детали	FAN5640S7X

подробное описание детали	FAN5640 Dual High-Side Constant Current Source for High-Voltage Keypad LED Illumination

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FAN5640 • Rev. 1.0.2

2

Block Diagram

Reference

+

Control

IOUT1

VIN

GND

RSET

EN

IOUT2

1:275 Current

Mirror Ratio

+

-

OTP

+

CLIM

500k

Figure 2. Block Diagram

Pin Configuration

Figure 3. Pin Assignments

Pin Definitions

Pin #

Name

Description

1

IOUT1

Output Current 1

. The programmed current IOUT is sourced from this pin. If only one channel is

used, IOUT1 and IOUT2 can be tied together to boost the output current. It can also be left

floating or tied to pin 5.

2

GND

Ground

3

RSET

. Connect a programming resistor REXT to this pin. This pin’s output voltage is 0.475V when

EN is HIGH. The current through the external resistor establishes the current IOUT, where IOUT =

275 • [0.475V / REXT].

4

EN

Enable

. When HIGH, the IC applies the programmed current IOUT to both IOUT1 and IOUT2.

When LOW, IC enters Shutdown Mode. If pulsed, this pin modulates the output current. The

minimum pulse width is determined by the speed of the turn-on circuitry. This pin contains an

internal pull-down resistor of 500K

.

5

VIN

Input Supply

. Apply 6 to 20V at this pin (see Dropout Limitations under the Application

Information section)

.

6

IOUT2

Output Current 2

. The programmed current IOUT is sourced from this pin. If only one channel is

used, IOUT1 and IOUT2 can be tied together to boost the output current. It can also be left

floating or tied to pin 5.

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