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MIC5020
Pin Con?guration
Micrel, Inc.
1
V DD
Gate 8
2
3
Input Sense- 7
Fault Sense+ 6
4
C T
Gnd 5
SOIC Package
(M)
Block Diagram
6V Internal Regulator
Sense+
Sense-
I 1
C INT
2I 1
50mV
Fault
Normal
Q1
ON
C T
Fault
V DD
Input
↑ ONE-
↓ SHOT
10I 2
I 2
OFF
6V
Gate
Transistor Count: 82
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
V DD
Input
Fault
C T
Gnd
Sense +
Sense –
Gate
Pin Function
Supply: +11V to +50V. Decouple with ≥ 10μF capacitor.
TTL Compatible Input: Logic high turns the external MOSFET on. An internal
pull-down returns an open pin to logic low.
Overcurrent Fault Indicator: When the sense voltage exceeds threshold,
open collector output is open circuit for 5μs (t G(ON) ), then pulled low for
t G(OFF) . t G(OFF) is adjustable from C T .
Retry Timing Capacitor: Controls the off time (t G(OFF) ) of the overcurrent
retry cycle. (Duty cycle adjustment.)
? Open = 20% duty cycle.
? Capacitor to Ground = approx. 20% to <1% duty cycle.
? Pull-Up resistor = approx. 20% to approx. 75% duty cycle.
? Ground = maintained shutdown upon overcurrent condition.
Circuit Ground
Current Sense Comparator (+) Input: Connect to high side of sense resistor
or current sensing MOSFET sense lead. A built-in offset in conjunction with
R SENSE sets the load overcurrent trip point.
Current Sense Comparator (–) Input: Connect to the low side of the sense
resistor (usually power ground).
Gate Drive: Drives the gate of an external power MOSFET. Also limits V GS
to 15V max. to prevent Gate to Source damage. Will sink and source
current.
MIC5020
2
July 2005
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