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LTM4600HV
APPLICATIO S I FOR ATIO
After the controller has been started and given adequate
time to charge up the output capacitor, C SS is used as a
short-circuit timer. After the RUN/SS pin charges above 4V,
if the output voltage falls below 75% of its regulated value,
then a short-circuit fault is assumed. A 1.8μA current then
begins discharging C SS . If the fault condition persists until
the RUN/SS pin drops to 3.5V, then the controller turns
off both power MOSFETs, shuting down the converter
to defeat latchoff. Any pull-up network must be able to
maintain RUN/SS above 4V maximum latchoff threshold
and overcome the 4μA maximum discharge current. Figure
3 shows a conceptual drawing of V RUN during startup and
short circuit.
V RUN/SS
4V
permanently. The RUN/SS pin must be actively pulled
down to ground in order to restart operation.
The over-current protection timer requires the soft-start
timing capacitor C SS be made large enough to guarantee
1.5V
3V
SHORT-CIRCUIT
LATCH ARMED
3.5V
that the output is in regulation by the time C SS has reached
the 4V threshold. In general, this will depend upon the size
of the output capacitance, output voltage and load current
SOFT-START
CLAMPING
OF I L RELEASED
OUTPUT
OVERLOAD
HAPPENS
SHORT-CIRCUIT
LATCHOFF
t
characteristic. A minimum external soft-start capacitor
can be estimated from:
V O
75%V O
C SS _ EXT + 1000 pF > C OUT ? V OUT ( 10 – 3 [ F / V S ])
Generally 0.1μF is more than suf?cient.
Since the load current is already limited by the current
mode control and current foldback circuitry during a
SWITCHING
STARTS
Figure 3. RUN/SS Pin Voltage During Startup and
Short-Circuit Protection
t
4600hv F03
shortcircuit, over-current latchoff operation is NOT always
V IN
V IN
RECOMMENDED VALUES FOR RUN/SS
needed or desired, especially the output has large amount
of capacitance or the load draw huge current during start
up. The latchoff feature can be overridden by a pull-up
R RUN/SS
LTM4600HV
RUN/SS
PGND SGND
V IN
4.5V TO 5.5V
10.8V TO 13.8V
24V TO 28V
R RUN/SS
50k
150k
500k
current greater than 5μA but less than 80μA to the RUN/SS
pin. The additional current prevents the discharge of C SS
during a fault and also shortens the soft-start period. Us-
ing a resistor from RUN/SS pin to V IN is a simple solution
4600hv F04
Figure 4. Defeat Short-Circuit Latchoff with a Pull-Up
Resistor to V IN
4600hvfc
12
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