EP3101 Datasheet, PDF (2/13 Pages) Eorex Corporation – 150 KHz, 3A Asynchronous Step-down Converter

eorex
Pin Assignment
EP3101
1 2345
V_IN GND EN
SW FB
TO220-5L
Ordering Information
EP3101 - X X X
Buck Regulator
Pin Description
Package
: TO263-5L
: TO220-5L
V_OUT
Blank: Adj
33 = 3.3V
50 = 5V
12 = 12V
Packing
R: Taping & Reel
B: Bag
Pin Name
Function
1
V_IN
This is the positive input supply for the IC switching regulator. A suitable
input bypass capacitor must be present at this pin to minimize voltage
transients and to supply the switching currents needed by the regulator.
Internal switch. The voltage at this pin switches between (+V_IN-V_SAT) and
2
SW
approximately-0.5V, with a duty cycle of approximately V_OUT/V_IN. To
minimize coupling to sensitive circuitry, the PC board copper area
connected to this pin should be kept a minimum.
3
GND _{Circuit ground.}
4
FB
Senses the regulated output voltage to complete the feedback loop.
Low enable. Allows the switching regulator circuit to be shutdown using
logic level signals thus dropping the total input supply current to
approximately 150uA. Pulling this pin below a threshold voltage of
5
approximately 1.3V turns the regulator on, and pulling this pin above
EN
1.3V (up to a maximum of 40V) shuts the regulator down. If this
shutdown feature is not needed, the EN pin can be wired to the ground
pin or it can be left open, in either case the regulator will be in the ON
condition.
Jul. 2006
www.eorex.com
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