Micrel
MIC2586/MIC2586R
Pin Number
13
Pin Name
SENSE
Pin Function
Circuit Breaker Sense Input: This pin is the (-) Kelvin sense connection for the
output supply rail. A low-valued resistor (R
SENSE
) between this pin and the VCC
pin sets the circuit breaker’s current limit trip point. When the current limit
detector circuit is enabled (as well as the current limit timer), while the FB pin
voltage remains higher than 1V, the voltage across the sense resistor (V
CC
-
V
SENSE
) will be regulated to V
TRIP
(47mV, typically) to maintain a constant current
into the load. When the FB pin voltage is less than
≅0.8V,
the voltage across the
sense resistor decreases linearly to a minimum of 12mV (typical) when the FB
pin voltage is at 0V.
To disable the circuit breaker (and defeat all current limit protections), the
SENSE pin and the VCC pin can be tied together.
14
VCC
Positive Supply Voltage Input: This pin is the (+) Kelvin sense connection for the
output supply rail. The nominal operating voltage range for the MIC2586 and the
MIC2586R is +10V to +80V, and VCC can withstand input transients up to
+100V. An undervoltage lockout circuit holds the GATE pin low whenever the
supply voltage to the MIC2586/MIC2586R is less than the V
UVH
threshold.
October 2004
5
M9999-102204
(408) 955-1690
MICREL [ MICREL SEMICONDUCTOR ]
