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參數(shù)資料
| 型號(hào)： | LTM4600IV |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 17 A SWITCHING REGULATOR, 800 kHz SWITCHING FREQ-MAX, BGA104 |
| 封裝： | 15 X 15 MM, 2.8 MM HEIGHT, ROHS COMPLIANT, MO-222, LGA-104 |
| 文件頁數(shù)： | 4/24頁 |
| 文件大?。?/td> | 351K |
| 代理商： | LTM4600IV |
PRERELEASE
LTM4600
12
4600p
APPLICATIO S I FOR ATIO
WU
U
After the controller has been started and given adequate
time to charge up the output capacitor, CSS 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 1.8A current then
begins discharging CSS. 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
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 CSS be made large enough to guarantee
that the output is in regulation by the time CSS has reached
the 4V threshold. In general, this will depends upon the
size of the output capacitance, output voltage and load
current characteristic. A minimum external soft-start
capacitor can be estimated from:
CpF
C
V
F V
SS EXT
OUT
S
_
–
(
[ /
])
+>
1000
10 3
Generally 0.1F is more than sufcient.
Since the load current is already limited by the current
mode control and current foldback circuitry during a
shortcircuit, over-current latchoff operation is NOT always
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
current greater than 5A but less than 80A to the RUN/SS
pin. The additional current prevents the discharge of CSS
during a fault and also shortens the soft-start period. Us-
ing a resistor from RUN/SS pin to VIN is a simple solution
VIN
500k
RUN/SS
4600 F04
LTM4600
PGND
SGND
Figure 4. Defeat Short-Circuit Latchoff with a Pull-Up
Resistor to VIN
Figure 3. RUN/SS Pin Voltage During Startup and
Short-Circuit Protection
VRUN/SS
3.5V
t
75%VO
SWITCHING
STARTS
SOFT-START
CLAMPING
OF IL RELEASED
SHORT-CIRCUIT
LATCHOFF
OUTPUT
OVERLOAD
HAPPENS
SHORT-CIRCUIT
LATCH ARMED
4V
3V
1.5V
4600 F03
VO
to defeat latchoff. Any pull-up network must be able to
maintain RUN/SS above 4V maximum latchoff threshold
and overcome the 4A maximum discharge current. Figure
3 shows a conceptual drawing of VRUN during startup and
short circuit.
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