參數(shù)資料
型號(hào)： IRU3146CF
廠商： International Rectifier
英文描述： DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND AUTO-RESTART
中文描述： 雙同步PWM控制器，帶有均流電路和自動(dòng)重新啟動(dòng)
文件頁(yè)數(shù)： 10/30頁(yè)
文件大?。?/td> 528K
代理商： IRU3146CF
10
Rev. 1.1
6/25/04
IRU3146
www.irf.com
APPLICATION INFORMATION
Design Example:
The following example is a typical application for IRU3146,
the schematic is Figure18 on page17.
V
IN
= 12V
V
OUT(2.5V)
= 2.5V @ 10A
V
OUT(1.8V)
= 1.8V @ 10A
V
OUT
= Output voltage ripple
3% of V
OUT
F
S
= 300KHz
Output Voltage Programming
Output voltage is programmed by reference voltage and
external voltage divider. The Fb1 pin is the inverting input
of the error amplifier, which is referenced to the voltage
on non-inverting pin of error amplifier. For this applica-
tion, this pin (V
P
) is connected to reference voltage (V
REF
).
The output voltage is defined by using the following equa-
tion:
R
6
R
5
( )
When an external resistor divider is connected to the
output as shown in Figure 11.
Figure 11 - Typical application of the IRU3146 for
programming the output voltage.
Equation (4) can be rewritten as:
R
6
= R
5
×
- 1
Will result to:
V
OUT(2.5V)
= 2.5V
V
REF
= 0.8V
R
9
= 2.14K,
R
5
= 1K
If the high value feedback resistors are used, the input
bias current of the Fb pin could cause a slight increase
in output voltage. The output voltage can be set more
accurately by using low value, precision resistors.
For a start-up time of 4ms for both output, the soft-start
capacitor will be 0.1
μ
F. Connect ceramic capacitors at
0.1
μ
F from SS1 pin and SS2 pin to GND.
Supply VCH1 and VCH2
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 12. This method is simple and inex-
pensive. The operation of the circuit is as follows: when
the lower MOSFET is turned on, the capacitor (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). Vc is approximately:
Capacitors in the range of 0.1
μ
F and 1
μ
F are generally
adequate for most applications. The diode must be a
fast recovery 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. For low voltage application, schottky di-
odes can be used to minimize forward drop across the
diodes at start up.
Figure 12 - Charge pump circuit.
V
OUT
V
P
Fb
IRU3146
V
OUT
R
5
R
6
V
REF
V
P
VCH1
V
OUT3
+ V
BUS
- (V
D1
+ V
D2
)
L2
IRU3146
D1
C1
VCH1
HDrv
Regulator
Q1
Q2
V
OUT3
C2
V
BUS
D2
C3
Css
25
×
t
START
(
μ
F) ---(5)
Where
t
START
is the desired start-up time (ms)
V
OUT
= V
P
×
1 +
---(4)
V
P2
= V
REF
= 0.8V
V
OUT(1.8V)
= 1.8V
V
REF
= 0.8
R
7
= 1.24K, R
8
= 1K
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:
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