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| 型号： | IR3622AMTRPbF |
| 厂商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING |
| 中文描述： | 高频2相，单或双输出同步降压控制器，输出跟踪和排序 |
| 文件页数： | 4/33页 |
| 文件大小： | 690K |
| 代理商： | IR3622AMTRPBF |
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IR3622AMPbF
www.irf.com
12
Current Share Mode
This feature allows to connect both outputs
together to increase current handling capability of
the converter to support a common load. In the
current sharing mode, error amplifier 1 becomes
the master which regulates the common output
voltage and the error amplifier 2 performs the
current sharing function, figure 6 shows the
configuration of error amplifier 2.
In this mode, IR3622A makes sure the master
channel starts first followed by slave channel to
prevent any glitch during start up. This is done by
clamping the output of slave’s error amplifier until
the master channel generates the first PWM
signal.
At no load condition the slave channel may be
kept off depending on the offset of the error
amplifier.
Lossless Inductor Current Sensing
The IR3622A uses a lossless current sensing for
current share purposes. The inductor current is
sensed by connecting a series resistor and a
capacitor network in parallel with the inductor
and by measuring the voltage across the
capacitor. The measured voltage is proportional
to the inductor current. This is shown figure 6.
The voltage across the inductor’s DCR can be
expressed by:
The voltage across the C
1 can expressed by:
Combining equations (1),(2) and (3) result in the
following expression for V
C1:
Usually the resistor R
1 and C1 are chosen so that
the time constant of R
1 and C1 equals the time
constant of the inductor which is the inductance
L
1 over the inductor’s DCR (RL1). If the two time
constants match, the voltage across C
1
is
proportional to the current through L
1, and
Fig. 6: Loss Less inductor current sensing
and current sharing
L1
RL1
R1
L2
RL2
R2
C2
VP2
FB2
C1
VOUT
Master Phase
Slave Phase
Q2
Q3
Q4
+ VC1(s) -
+
VL1 (s) -
Vin
IL1
the sense circuit can be treated as if only a
sense resistor with the value R
L1 was used.
The mismatch of the time constant does not
affect the measurements of inductor DC current,
but affects the AC component of the inductor
current.
Soft-Start
The IR3622A has programmable soft-start to
control the output voltage rise and limit the inrush
current during start-up. It provides a separate
soft-start function for each output. This will
enable to sequence the outputs by controlling the
rise time of each output through selection of
different value soft-start capacitors.
To ensure correct start-up, the soft-start
sequence initiates when the Vcc and Enable rise
above their threshold and generate the Power
On Reset (POR) signal. Soft-start function
operates by sourcing an internal current to
charge an external capacitor to about 3V.
Initially, the soft-start function clamps the error
amplifier’s output of the PWM converter.
)
1
(
-
sL
R
V
s
V
1
L
1
L
out
in
1
RL
+
=
*
)
(
)
(
)
2
(
-
R
I
s
V
1
L
1
L
1
RL
*
)
(
=
)
3
(
-
sC
1
R
sC
1
V
s
V
1
out
in
1
C
+
=
*
)
(
)
(
)
4
(
-
C
sR
1
sL
R
I
s
V
1
L
1
L
1
C
*
)
(
+
=
1
L
1
L
C
1
L
1
R
I
s
V
R
L
C
R
If
*
)
(
*
:
≈
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3622MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 32MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IR3622MTRPBF | 功能描述:开关变换器、稳压器与控制器 HI FREQ 2-PHASE Single or Dual SYNCH RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IR3623MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 32MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IR3623MPBF_1 | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING |
| IR3623MTRPBF | 功能描述:开关变换器、稳压器与控制器 HI FREQ 2-PHASE Single or Dual SYNCH RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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