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FAN5640S7X Scheda tecnica(PDF) 2 Page - Fairchild Semiconductor

Il numero della parte FAN5640S7X
Spiegazioni elettronici  FAN5640 Dual High-Side Constant Current Source for High-Voltage Keypad LED Illumination
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
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
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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