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Block Diagram
EN
OTP
+
CLIM
1:275 Current
Mirror Ratio
VIN
IOUT1
500k
IOUT2
Reference
+
Control
GND
+
-
RSET
Figure 2. Block Diagram
Pin Configuration
Figure 3. Pin Assignments
Pin Definitions
Pin #
1
2
3
4
5
6
Name
IOUT1
GND
RSET
EN
VIN
IOUT2
Description
Output Current 1 . The programmed current I OUT 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.
Ground
RSET . Connect a programming resistor R EXT to this pin. This pin’s output voltage is 0.475V when
EN is HIGH. The current through the external resistor establishes the current I OUT , where I OUT =
275 ? [0.475V / R EXT ].
Enable . When HIGH, the IC applies the programmed current I OUT 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 ? . ?
Input Supply . Apply 6 to 20V at this pin (see Dropout Limitations under the Application
Information section) .
Output Current 2 . The programmed current I OUT 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.
? 2006 Fairchild Semiconductor Corporation
FAN5640 ? Rev. 1.0.2
2
www.fairchildsemi.com
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