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參數(shù)資料
| 型號(hào)： | IR3628MTRPBF |
| 廠商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER |
| 中文描述： | 高頻同步PWM降壓控制器 |
| 文件頁數(shù)： | 22/22頁 |
| 文件大?。?/td> | 581K |
| 代理商： | IR3628MTRPBF |
IR3628MPbF
08/10/2007
Soft-Start
The IR3628 has programmable soft-start to
control the output voltage rise and limit the inrush
current during start-up.
To ensure
correct
start-up,
the soft-start
sequence initiates when Vcc and Vc rise above
their threshold and generate the Power On
Ready (POR) signal. The soft-start function
operates by sourcing current to charge an
external capacitor to about 3V.
Initially, the soft-start function clamps the output
of error amplifier by injecting a current (40uA)
into the Fb pin and generates a voltage about
0.96V (40ux24K) across the negative input of
error amplifier (see figure 5).
The magnitude of the injected current is inversely
proportional to the voltage at the soft-start pin. As
the soft-start voltage ramps up, the injected
current decreases linearly and so does the
voltage at negative input of error amplifier.
When the soft-start capacitor is around 1V, the
voltage at the positive input of the error amplifier
is approximately 0.6V.
The output of error amplifier will start increasing
and generating the first PWM signal. As the soft-
start capacitor voltage continues to go up, the
current flowing into the Fb pin will keep
decreasing.
The feedback voltage increases linearly as the
soft start voltage ramps up. When soft-start
voltage is around 2V the output voltage is
reached the steady state and the injected current
is zero.
Figure 6 shows the theoretical operational
waveforms during soft-start.
The output voltage start-up time is the time
period
when
soft-start
capacitor
voltage
increases from 1V to 2V.
The start-up time will be dependent on the size of
the external soft-start capacitor and can be
estimate by:
Fig. 5: Soft-Start circuit for IR3628
Fig. 6: Theoretical operation waveforms
during soft-start
20uA
40uA
POR
Error Amp
SS/SD
Fb
Comp
24K
0.6V
24K
3V
Soft-Start
Voltage
Voltage at negative input
of Error Amp
Voltage at Fb pin
Current flowing
into Fb pin
40uA
0uA
0V
0.6V
0.96V
0.6V
0V
3V
2V
1V
Output of UVLO
POR
For a given start-up time, the soft-start capacitor
(nF) can be estimated as:
V
1
V
2
C
T
μA
20
ss
start
=
)
1
--(
ms
T
A
20
C
start
SS
)
(
*
μ
9
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| IR3629 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
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