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参数资料
| 型号： | IRPP3624-12A |
| 厂商： | International Rectifier |
| 文件页数： | 11/21页 |
| 文件大小： | 0K |
| 描述： | KIT REF DES 12A 1PH SYNC BUCK |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 系列： | POWIR+™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 12A |
| 输入电压： | 10.8 ~ 13.2 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 600kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | IR3624，IRF7823，IRF7832Z |
| 相关产品： | IR3624MPBF-ND - IC REG CTRLR BUCK PWM VM 10-MLPD IR3624MTRPBFCT-ND - IC REG CTRLR BUCK PWM VM 10-MLPD IR3624MTRPBFTR-ND - IC REG CTRLR BUCK PWM VM 10-MLPD IRF7832ZTR-ND - MOSFET N-CH 30V 21A 8-SOIC IRF7832Z-ND - MOSFET N-CH 30V 21A 8-SOIC |
IR3624MPBF
Application Information
Design Example:
The following example is a typical application for
IR3624. The application circuit is shown in
page17.
V in = 12 V , ( 13 . 2 V , max)
V o = 1 . 8 V
I o = 6 A
? V o ≤ 30 mV
F s = 600 kHz
Output Voltage Programming
Output voltage is programmed by reference
voltage and external voltage divider. The Fb pin
is the inverting input of the error amplifier, which
is internally referenced to 0.6V. The divider is
ratioed to provide 0.6V at the Fb pin when the
output is at its desired value. The output voltage
is defined by using the following equation:
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
by using:
C SS ? 20 μ A * T start --( 1 )
Where T start is the desired start-up time (ms)
For a start-up time of 5ms, the soft-start
capacitor will be 0.1uF. Choose a ceramic
capacitor at 0.1uF.
Vc supply for single input voltage
To drive the high side switch, it is necessary to
supply a gate voltage at least 4V grater than the
bus voltage. This is achieved by using a charge
pump configuration as shown in figure 11. This
method is simple and inexpensive. The operation
of the circuit is as follows: when the lower
MOSFET is turned on, the capacitor (C1) is
pulled down to ground and charges, up to V BUS
value, through the diode (D1). The bus voltage
V o = V ref ? ? ? 1 + 8 ? ?
? R ?
? R 9 ?
--( 4 )
will be added to this voltage when upper
MOSFET turns on in next cycle, and providing
supply voltage (Vc) through diode (D2). Vc is
When an external resistor divider is connected to
approximately:
the output as shown in figure 10.
V C ? 2 ? V bus ? ( V D 1 + V D 2 )
--( 6 )
IR3624
Fb
V OUT
R 8
R 9
Capacitors in the range of 0.1uF is generally
adequate for most applications. The diodes must
be a fast recovery device to minimize the amount
of charge fed back from the charge pump
capacitor into V BUS . The diodes need to be able
to block the full power rail voltage, which is seen
when the high side MOSFET is switched on. For
low voltage application, schottky diodes can be
Fig. 10: Typical application of the IR3624 for
programming the output voltage
used to minimize forward drop across the diodes
at start up.
Equation (4) can be rewritten as:
V BUS
C3
D1
D2
R 9 = R 8 ? ? ?
? ?
? V ref
? V O ? V ref
?
?
--( 5 )
Vc
C2
C1
V BUS
Q1
L
For the calculated values of R 8 and R 9 see
feedback compensation section.
IR3624
HDrv
Q2
Fig. 11: Charge pump circuit to generate
Vc voltage
11
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