参数资料
型号: IR3623MTRPBF
厂商: International Rectifier
文件页数: 12/27页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 32MLPQ
标准包装: 1
PWM 型: 电压模式
输出数: 2
频率 - 最大: 1.2MHz
占空比: 85%
电源电压: 8.5 V ~ 14.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 32-VFQFN 裸露焊盘
包装: 标准包装
其它名称: IR3623MTRPBFDKR
IR3623MPbF
Soft-Start (cont.)
3 V
During power up, the converter output starts at
zero and thus the voltage at Fb is about 0V. A
current (64uA) injects into the Fb pin and
generates a voltage about 1.6V (64ux25K)
across the negative input of error amplifier, see
figure 7.
The magnitude of this current is inversely
proportional to the voltage at soft-start pin. The
28uA current source starts to charge up the
external capacitor. In the mean time, the soft-
start voltage ramps up, the current flowing into
Fb pin starts to decrease linearly and so does the
voltage at negative input of error amplifier.
When the soft-start capacitor is around 1V, the
voltage at the negative input of the error amplifier
is approximately 0.8V.
As the soft-start capacitor voltage charges up,
the current flowing into the Fb pin keeps
decreasing.
The feedback voltage increases linearly as the
injecting current goes down. The injecting current
drops to zero when soft-start voltage is around
1.8V and the output voltage goes into steady
state. Figure 8 shows the theoretical operational
waveforms during soft-start.
The output 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. The start-
SS1/SD1
Seq
Fb1
VP1
SS2/SD2
Fb2
VP2
Track
64uA
POR
64uA
POR
I SS1 = 28uA
I hiccup1 = 3uA
E/A1
3 V
I SS2 = 28uA
OCP2
I hiccup2 = 3uA
E/A2
OCP1
up time can be estimated by:
Fig. 7: Soft-Start circuit for IR3623
28 μ A ?
T start
C ss
? 1 . 8 V ? 1 V
Output of POR
3V
For a given start up time, the soft-start capacitor
? 1.8V
(nF) can be estimated as:
Soft-Start
Voltage
0V
? 1V
C SS ?
20 ( ? A ) * T start ( ms )
0 . 8 ( V )
- - - - ( 5 )
Current flowing
into Fb pin
64uA
0uA
For normal start up the Seq pin should be pulled
Voltage at negative input ? 1.6V
of Error Amp
0.8V
high (usually can be connected to Vout3).
0.8V
Voltage at Fb pin
0V
Fig. 8: Theoretical operation waveforms
during soft-start
www.irf.com
January 28, 2013
12
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IR3629 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT