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参数资料
| 型号： | IR3623MPBF |
| 厂商： | International Rectifier |
| 文件页数： | 11/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 32MLPQ |
| 标准包装： | 73 |
| 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： | 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 ~ 125°C |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 包装： | 管件 |
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IR3623MPbF
Current Share Mode
This feature allows to connect both outputs
V in
Master Phase
IL1
together to increase current handling capability of
L1
R L1
the converter to support a common load. In
current sharing mode, error amplifier 1 becomes
Q2
+
R1
V L1 (s) -
C1
the master which regulates the common output
voltage and the error amplifier 2 performs the
+ V C1 (s) -
current sharing function, figure 6 shows the
configuration of error amplifiers.
In this mode IR3623 make sure the master
channel starts first followed by slave channel to
prevent any glitch during start up. This is done by
VP2
FB2
V OUT
clamping the output of slave’s error amplifier until
the master channel generates the first PWM
signal.
V in
Q3
R2
C2
At no load condition the slave channel may be
kept off depends on the offset of error amplifier.
Q4
L2
R L2
Slave Phase
Lossless Inductor Current Sensing
The IR3623 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 inductor and
measuring the voltage across the capacitor, this
Fig. 6: Loss Less inductor current sensing
and current sharing
the sense circuit can be treated as if only a
sense resistor with the value R L1 was used.
voltage is proportional to the inductor current. As
shown in figure 6 the voltage across the
inductor’s DCR can be expressed by:
If : R 1 * C 1 ?
L 1
R L 1
V RL 1 ( s ) ? ( V in ? V out ) *
R L 1
R L 1 * sL 1
- - - - ( 1 )
V C ( s ) ? I L 1 * R L 1
The mismatch of the time constant does not
V RL 1 ( s ) ? I L 1 * R L 1
- - - - ( 2 )
affect the measurements of inductor DC current,
but affects the AC component of the inductor
The voltage across the C 1 can expressed by:
current.
R 1 * 1
V C 1 ( s ) ? ( V in ? V out
) *
1
sC 1
sC 1
- - - - ( 3 )
Soft-Start
The IR3623 has programmable soft-start to
control the output voltage rise and limit the inrush
current during start-up. It provides a separate
Combining equations (1),(2) and (3) result to the
following expression for V C1 :
Soft-start function for each outputs. This will
enable to sequence the outputs by controlling the
rise time of each outputs through selection of
V C 1 ( s ) ? I L 1 *
R L 1 ? sL 1
1 ? sR 1 * C 1
- - - - ( 4 )
different value soft-start capacitors.
To ensure correct start-up, the soft-start
sequence initiates when the Vcc, Enable and
Usually the resistor R 1 and C 1 are chosen so that
the time constant of R 1 and C 1 equals the time
constant of the inductor which is the inductance
L 1 over the inductor’s DCR (R L1 ). If the two time
constants match, the voltage across C 1 is
proportional to the current through L 1 , and
5V_sns 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.
www.irf.com
January 28, 2013
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| IR3624MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 10-MLPD 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) |
| IR3624MTRPBF | 功能描述:开关变换器、稳压器与控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 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 |
| IR3628MPBF | 功能描述:IC CTLR PWM BUCK SYNC 12-MLPD RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
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