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参数资料
| 型号： | IR3622AMPBF |
| 厂商： | International Rectifier |
| 文件页数： | 16/33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： | 600kHz |
| 占空比： | 84% |
| 电源电压： | 4.5 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 |
| 配用： | IRDC3622S-ND - BOARD EVALUATION W/IR3622MPBF IRDC3622D-ND - BOARD EVAL W/IR3622MPBF DUAL OUT |
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IR3622AMPbF
Over-Current Protection
The over current protection is performed by
28uA
sensing current through the R ds(on) of the low side
MOSFET (Q2). This method enhances the
23uA
OCP
converter’s efficiency and reduce cost by
eliminating a current sense resistor. As shown in
figure 13, an external resistor (R SET ) is connected
between the OCSet pin and the drain of Q2
which sets the current limit set point.
SS1 / SD
20
3uA
The internal current source develops a voltage
across R SET . When the Q2 is turned on, the
inductor current flows through the Q2 and results
in a voltage drop which is given by:
Fig. 14: 3uA current source for discharging
soft-start capacitor during hiccup
The OCP circuit starts sampling current when the
low gate drive is about 3V. The OCSet pin is
V OCSet = (I OCSet ? R OCSet ) ? (R ds(on) ? I L )
- - - - ( 6 )
internally clamped to approximately 1.4V during
deadtime to prevent false trigging. Figure 15
shows the OCSet pin during one switching cycle.
IR3622
I OCSET
OCSet R SET
Q1
L1
V OUT
There is about 150ns delay to mask out the
deadtime, since this node contains switching
noise, this delay also functions as a filter.
Q2
Hiccup
Control
Fig. 13: Connection of over current sensing resistor
The critical inductor current can be calculated by
setting:
V OCSet = (I OCSet ? R OCSet ) ? (R ds(on) ? I L ) = 0
Deadtime
Blanking time
= OCSet OCSet
I SET = I L ( critical )
R ? I
R ds ( on )
- - - - ( 7 )
I ocset * R ocset
Clamp Voltage
An over current is detected if the OCSet pin goes
below ground. This trips the OCP comparator
and cycles the soft start function in hiccup mode.
The hiccup is performed by charging and
discharging the soft-start capacitor at a certain
slope rate. As shown in figure 14 the 3uA current
source is used to discharge the soft-start
capacitor.
The OCP comparator resets after every soft start
cycles, and the converter stays in this mode until
the overload or short circuit is removed. The
converter will automatically recover.
www.irf.com
Fig. 15: OCset pin during normal condition
Ch1: Inductor point, Ch2:LDrv, Ch3:OCSet
The value of R SET should be checked in an actual
circuit to ensure that the over current protection
circuit activates as expected. The IR3622A
current limit is designed primarily as short circuit
protection, "no blow up" circuit, and doesn't
operate as a precision current regulator.
When the SS2 is floating, an over current
condition on either phase would result in hiccup
current protection.
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3622AMTRPBF | 功能描述:开关变换器、稳压器与控制器 2 CH OR 2 PHASE SYNC PWM CNTRLR 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 |
| 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 |
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