Micrel, Inc.
MIC2310
 
 
July 2008 
30
M9999-070108-A
 
Open GNDSENSE Detector Trips CB
In order to protect the system from the result of an
open GNDSENSE pin, the controller incorporates an
open   GNDSENSE   detection   scheme.   An   open
GNDSENSE pin could result in the effective primary
OC detection threshold being at an unsafe level. The
timing diagram in Figure 16 describes the operation of
this function. With the applied V
CC
 supply high such
that the internal V
REG
 voltage is above the controllers
V
VREG(UVLOH)
 threshold voltage, an elapsed POR timer,
and with the application of an ENABLE LOW-to-HIGH
transition, the GATE drive circuitry is enabled and the
GATE   voltage   begins   to   rise.   As   the   external
MOSFET turns ON, the SOURCE voltage begins to
rise also and the LOADSENSE voltage follows the
SOURCE voltage. Normally, the GNDSENSE pin
would remain at 0V. However, if the GNDSENSE pin
is open, the GNDSENSE voltage will rise due to the
load of other internal circuitry. An open GNDSENSE
pin is detected by comparing the voltage at the
GNDSENSE pin to the voltage at the AGND pin. Once
the voltage at the GNDSENSE pin differs from the
voltage at the AGND pin by V
THGNDSENSE
, a circuit
breaker   is   tripped,   the   GATE   drive   circuitry   is
disabled, the GATE fault-mode pull-down current sink
is enabled, and the DISCH output goes high. This
circuit breaker can be reset, such that the GATE drive
circuitry can be re-enabled, by either a HIGH-to-LOW
transition on ENABLE or turning off the V
CC
  supply
voltage to the controller such that V
REG
 falls below the
controllers V
VREG(UVLOL)
 threshold voltage.
 
V
CC
 & V
REG
ENABLE
GATE
V
OUT
I
LOAD
PWRGD
GNDSENSE
DISCH
V
VREG(UVLOL)
V
GSPGH
V
PGH
t
POR
V
VREG(UVLOH)
VTHGNDSENSE
VVREG(UVLOH)
GNDSENSE CONNECTED
t
POR
GNDSENSE OPEN
 
 
Figure 16. Open GNDSENSE Detector Trips CB
 
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