15
LTC4210-1/LTC4210-2
421012f
Normal Mode/External Timer Control
Whenever the TIMER pin voltage drops below the COMP1
threshold, but is not in reset mode, the TIMER enters
normal (100礎 source) mode with an equivalent 7k resis-
tive pull-down. Table 1 shows the relationship of t
INITIAL
,
t
CBDELAY
, t
COOLOFF
vs C
TIMER
.
If the TIMER pin is pulled beyond the COMP2 threshold,
the GATE pin is pulled to ground immediately. This allows
the TIMER pin to be used for overvoltage detection, see
Figure 11.
Externally forcing the TIMER pin below the COMP1 thresh-
old will reset the TIMER to normal mode. During overvolt-
age detection, the TIMERs 100礎 pull-down current will
continue to be on if (V
CC
SENSE) voltage is below 50mV.
If the (V
CC
SENSE) voltage exceeds 50mV during the
overvoltage detection, the TIMER current will be the same
as described for latched-off or autoretry mode. See the
section OVERVOLTAGE DETECTION USING TIMER PIN
for details of the application.
Power-Off Cycle
The system can be reset by toggling the ON pin low for
more than 30祍 as shown at time point 7 of Figure 3. The
GATE pin is pulled to ground. The TIMER capacitor is also
discharged to ground. C
LOAD
discharges through the load.
Alternatively, the TIMER pin can be externally driven above
the COMP2 threshold to turn off the GATE pin.
POWER MOSFET SELECTION
Power MOSFETs can be classified by R
DSON
at V
GS
gate
drive ratings of 10V, 4.5V, 2.5V and 1.8V. Use the typical
curves VGATE vs Supply Voltage and VGATE vs Tem-
perature to determine whether the gate drive voltage is
adequate for the selected MOSFET at the operating volt-
age.
In addition, the selected MOSFET should fulfill two V
GS
criteria:
1. Positive V
GS
absolute maximum rating > LTC4210
maximum V
GATE
, and
2. Negative V
GS
absolute maximum rating > supply
voltage. The gate of the MOSFET can discharge faster
than V
OUT
when shutting down the MOSFET with a large
C
LOAD
.
If one of the conditions cannot be met, an external Zener
clamp shown on Figure 10a or Figure 10b can be used. The
selection of R
G
should be within the allowed LTC4210
package dissipation when discharging V
OUT
via the Zener
clamp.
APPLICATIO S I FOR ATIO
U
U
U
Table 1. t
INITIAL
, t
CBDELAY
, t
COOLOFF
vs C
TIMER
C
TIMER
(?/SPAN>F)
t
INITIAL
(ms)
t
CBDELAY
(ms)
t
COOLOFF
(ms)
0.033
9.0
0.7
18.2
0.047
12.8
1
25.9
0.068
18.6
1.5
37.4
0.082
22.4
1.8
45.1
0.1
27.3
2.2
55
0.22
60.0
4.8
121
0.33
90.1
7.2
181.5
0.47
128.3
10.2
258.5
0.68
185.6
14.7
374
0.82
223.8
17.8
451
1
272.9
21.7
550
2.2
600.5
47.7
1210
3.3
900.7
71.5
1815
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