參數(shù)資料
型號(hào)： HA16120FPJ
廠商： Hitachi,Ltd.
英文描述： CAP 1000PF 25V 5% NP0(C0G) SMD-0603 TR-7 PLATED-NI/SN
中文描述： 開關(guān)穩(wěn)壓器的斬波式直流/直流轉(zhuǎn)換器
文件頁(yè)數(shù)： 11/38頁(yè)
文件大?。?/td> 275K
代理商： HA16120FPJ
HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
11
3.2 Soft-Start Setting
Soft-start avoids overshoot at power-up by widening the PWM output pulses gradually, so that the
converted DC output rises slowly. Soft-start is programmed by connecting a capacitor between the DB pin
and ground. The soft-start time is determined by the time constant of this capacitor and the resistors that
set the voltage at the DB pin.
V
DB
= Vref
×
V
X
V
DB
R
2
R
1
+ R
2
R =
R
1
×
R
2
R
1
+ R
2
t
soft
=
C
1
×
R
×
ln (1
)
Note:
V
X
is the voltage at the DB pin after time t (V
X
< V
DB
).
+
+
To Vref
R
R
V
X
DB
E/O
PWM
COMP
from
UVL
V
TH
V
TL
1.6 V
1.0 V
t
C
1
Soft-start time
t
soft
Undervoltage
lockout released
V
DB
V
X
UVL sink
transistor
1
2
Sawtooth
wave
Sawtooth wave
Figure 3.2 Soft-Start Setting
3.3 Quick Shutdown
The quick shutdown function resets the voltages at all pins when the IC is turned off, to assure that PWM
pulse output stops quickly. Since the UVL pull-down resistor in the IC remains on even when the IC is
turned off, the sawtooth wave output, error amplifier output, and DB pin are all reset to low voltage.
This feature helps in particular to discharge capacitor C
1
in figure 3.2, which has a comparatively large
capacitance. In intermittent mode (explained on a separate page), this feature enables the IC to soft-start in
each on-off cycle.
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