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参数资料
| 型号： | IRPP3624-12A |
| 厂商： | International Rectifier |
| 文件页数： | 9/21页 |
| 文件大小： | 0K |
| 描述： | KIT REF DES 12A 1PH SYNC BUCK |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 系列： | POWIR+™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 12A |
| 输入电压： | 10.8 ~ 13.2 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 600kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | IR3624，IRF7823，IRF7832Z |
| 相关产品： | IR3624MPBF-ND - IC REG CTRLR BUCK PWM VM 10-MLPD IR3624MTRPBFCT-ND - IC REG CTRLR BUCK PWM VM 10-MLPD IR3624MTRPBFTR-ND - IC REG CTRLR BUCK PWM VM 10-MLPD IRF7832ZTR-ND - MOSFET N-CH 30V 21A 8-SOIC IRF7832Z-ND - MOSFET N-CH 30V 21A 8-SOIC |
IR3624MPBF
Soft-Start
The IR3624 has programmable soft-start to
control the output voltage rise and limit the inrush
current during start-up.
20uA
3V
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
SS/SD
POR
40uA
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
Comp
0.6V
Fb
24K
24K
Error Amp
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.
Fig. 5: Soft-Start circuit for IR3624
Output of UVLO
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
POR
3V
? 2V
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
Soft-Start
Voltage
Current flowing
into Fb pin
0V
40uA
0uA
? 1V
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
Voltage at negative input ? 0.96V
of Error Amp
0.6V
0.6V
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
Voltage at Fb pin
0V
estimate by:
Fig. 6: Theoretical operation waveforms
20 μA ?
T start
C ss
= 2 V ? 1 V
during soft-start
For a given start-up time, the soft-start capacitor
(nF) can be estimated as:
C SS ? 20 μ A * T start ( ms )
--( 1 )
9
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