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参数资料
| 型号： | IR3621FTR |
| 厂商： | International Rectifier |
| 文件页数： | 11/29页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 28TSSOP |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 0 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 345kHz |
| 占空比： | 86.5% |
| 电源电压： | 5.5 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： | 28-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 标准包装 |
| 产品目录页面： | 1383 (CN2011-ZH PDF) |
| 配用： | IRDC3621-ND - BOARD EVAL DUAL SYNC BUCK CTRLR |
| 其它名称： | IR3621FDKR |
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IR3621 & (PbF)
APPLICATION INFORMATION
Design Example:
The following example is a typical application for the
IR3621, the schematic is Figure19 on page18.
V IN = 12V
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:
V OUT(2.5V) = 2.5V @ 10A
Css ? 28 × t START ( μ F)
---(5)
( )
V OUT = V P2 × 1 +
V OUT(1.8V) = 1.8V @ 10A
? V OUT = Output voltage ripple ? 3% of V OUT
F S = 400kHz
Output Voltage Programming
Output voltage is programmed by the reference voltage
and an external voltage divider. The Fb1 pin is the invert-
ing input of the error amplifier, which is referenced to the
voltage on the non-inverting pin of error amplifier. For this
application, this pin (V P2 ) is connected to the reference
voltage (V REF ). The output voltage is defined by using the
following equation:
R 6
---(4)
R 5
V P2 = V REF = 0.8V
When an external resistor divider is connected to the
output as shown in Figure 11.
V OUT
Where t START is the desired start-up time (ms)
For a start-up time of 4ms for both output, the soft-start
capacitor will be 0.1 μ F. Connect two 0.1 μ Fceramic
capacitors from SS1 pin and SS2 pin to GND.
Supply VcH1 and VcH2
To drive the high side MOSFET, it is necessary to sup-
ply a gate voltage at least 4V greater than the bus volt-
age. This is achieved by using a charge pump configu-
ration as shown in Figure 12. This method is simple
and inexpensive. The operation of the circuit is as fol-
lows: when the lower MOSFET is turned on, the ca-
pacitor (C1) charges up to V OUT3 , through the diode
(D1). The bus voltage will be added to this voltage when
upper MOSFET turns on in next cycle, and providing
supply voltage (VcH1) through diode (D2). VcH1 is ap-
proximately:
VCH1 ? V OUT3 + V BUS - (V D1 + V D2 )
IR3621
V REF
V P2
Fb
R 6
R 5
Capacitor in the range of 0.1 μ F is generally adequate
for most applications. The diode must be a fast recov-
ery device to minimize the amount of charge fed back
from the charge pump capacitor into V OUT3 . The diodes
need to be able to block the full power rail voltage, which
is seen when the high side MOSFET is switched on.
Figure 11 - Typical application of the IR3621 for pro-
gramming the output voltage.
Equation (4) can be rewritten as:
For low voltage application, Schottky diodes can be
used to minimize forward drop across the diodes at
start up.
D1
( V V
)
R 6 = R 5 ×
OUT
P
-1
V OUT3
C3
D2
Will result to:
V OUT(2.5V) = 2.5V
V OUT(1.8V) = 1.8V
Regulator
VcH1
C2
C1
V BUS
Q1
V REF = 0.8V
R 9 = 2.15K, R 5 = 1K
V REF = 0.8
R 7 = 1.24K, R 8 = 1K
L2
If the high value feedback resistors are used, the input
bias current of the Fb pin could cause a slight increase
IR3621
HDrv
Q2
in output voltage. The output voltage can be set more
accurately by using low value, precision resistors.
www.irf.com
Figure 12 - Charge pump circuit.
11
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| IR3621FTRPBF | 功能描述:DC/DC 开关控制器 2-PHASE DUAL SYNC PWM CTRLLER RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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