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参数资料
| 型号： | IR3622AMPBF |
| 厂商： | International Rectifier |
| 文件页数： | 18/33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
Application Information
Design Example:
The following is a design of typical single output
current share application for IR3622A. The
application circuit is shown on page 26.
Soft-Start Programming
The soft-start timing can be programmed by
selecting the soft-start capacitance value. The
start-up time of the converter can be calculated
using the following expression:
V in = 12 V , ( ± 10 %)
V o = 1 . 8 V
C SS ( nF ) ? 28 . 75 ( μ A ) * T start ( ms )
- - - - ( 10 )
I o = 40 A
? V o ≤ 30 mV
F s = 375 kHz
Where T start is the desired start-up time (ms)
For a start-up time of 5ms, the soft-start
capacitor will be 0.15uF. Choose a ceramic
capacitor at 0.15uF.
Output Voltage Programming
Output voltage is programmed by reference
voltage and external voltage divider. As shown in
figure 17 the Fb1 pin is the inverting input of the
error amplifier, which is internally referenced to
0.8V. The divider is set to provide 0.8V at the Fb
pin when the output is at its desired value. The
output voltage is defined by the following
equation:
Input Capacitor Selection
The 180 o out of phase will reduce the RMS value
of the ripple current seen by input capacitors.
This reduces numbers of input capacitors. The
input capacitors must be able to handle both the
maximum ripple RMS current at the highest
ambient temperature, as well as the maximum
input voltage. The RMS value of current ripple for
a duty cycle under 50% is expressed by:
( I D ( 1 ? D ) + I D ( 1 ? D ) ? 2 I I D D )
IR3622A
V OUT
R 6
I RMS =
2 2
1 1 1 2 2 2 1 2 1 2
- - - - ( 11 )
Fb1
R 5
Fig. 17: Typical application of the IR3622A for
programming the output voltage
Where:
-I RMS is the RMS value of the input capacitor
current
-D 1 and D 2 are duty cycle for each channel
-I 1 and I 2 are the output current for each channel
For Io=40A and D=0.16 (1.8V/10.8V),
the I RMS = 9.43A.
V o = V REF ? ? ? 1 + 6 ? ?
? R ?
? R 5 ?
- - - - ( 8 )
Ceramic capacitors are recommended due to
their peak current capabilities. They also feature
low ESR and ESL at higher frequency, which
Equation (8) can be rewritten as:
enhance circuit efficiency.
Use 10x22uF, 16V ceramic capacitor from TDK
R 5 = R 6 ? ? ?
? ?
? V ref
? V o ? V ref
?
?
- - - - ( 9 )
(C3225X5R1C226M).
For the single output application when the duty
cycle is larger than 50% the following equation
For the calculated values of R 5 and R 6 see
feedback compensation section.
can be used to calculate the total RMS current
for the input capacitor current:
www.irf.com
I RMS = I O ( 2 D ( 1 ? D ) + ( 2 ? 2 D ) )
D > 0.5
18
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相关代理商/技术参数 |
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| 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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