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參數(shù)資料
| 型號(hào)： | IRU3073 |
| 廠商： | International Rectifier |
| 英文描述： | SYNCHRONOUS PWM CONTROLLER WITH OVER-CURRENT PROTECTION / LDO CONTROLLER |
| 中文描述： | 同步PWM控制器，帶有過(guò)電流保護(hù)/ LDO控制器 |
| 文件頁(yè)數(shù)： | 8/21頁(yè) |
| 文件大?。?/td> | 236K |
| 代理商： | IRU3073 |
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8
Rev. 1.0
09/17/03
IRU3073
www.irf.com
V
IN
- V
OUT
= L
×
t
t = D
×
f
1
S
V
OUT
V
IN
i
L = (V
IN
- V
OUT
)
×
V
V
IN
×
i
×
f
S
Where:
V
IN
= Maximum Input Voltage
V
OUT
= Output Voltage
i = Inductor Ripple Current
f
S
= Switching Frequency
t = Turn On Time
D = Duty Cycle
OUT
APPLICATION INFORMATION
Design Example:
The following example is a typical application for IRU3073,
the schematic is Figure 17 on page 16.
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 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:
V
OUT
= V
P
×
1 +
---(7)
R
5
( )
When an external resistor divider is connected to the
output as shown in Figure 8.
Figure 8 - Typical application of the IRU3039 for
programming the output voltage.
Equation (7) can be rewritten as:
R
6
= R
5
×
( )
Choose R
5
= 1K. This will result to
R
6
= 2.15K
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 set point can be
more accurate by using precision resistor.
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:
Css
20
×
t
START
(
μ
F) ---(8)
Where
t
START
is the desirable start-up time (s)
For a start-up time of 5ms, the soft-start capacitor will
be 0.1
μ
F. Choose a ceramic capacitor at 0.1
μ
F.
Supply VcL and VcH
To drive the high side switch, it is necessary to supply a
gate voltage at least 4V greater than the Bus voltage.
For this application, VcL and VcH are biased with a sepa-
rate 12V supply.
Input Capacitor Selection
The input filter capacitor should be based on how much
ripple the supply can tolerate on the DC input line. The
ripple current generated during the on time of upper
MOSFET should be provided by input capacitor. The RMS
value of this ripple is expressed by:
For higher efficiency, a low ESR capacitor is recom-
mended. Choose two Poscap from Sanyo 6TPB47M
(16V, 47
μ
F) with a max allowable ripple current of 5.2A.
Inductor Selection
The inductor is selected based on operating frequency,
transient performance and allowable output voltage ripple.
Low inductor value results to faster response to step
load (high di/dt) and smaller size but will cause larger
output ripple due to increase of inductor ripple current.
As a rule of thumb, select an inductor that produces a
ripple current of 10-40% of full load DC.
For the buck converter, the inductor value for desired
operating ripple current can be determined using the fol-
lowing relation:
R
6
V
P
= V
REF
= 0.8V
Fb
IRU3073
V
OUT
R
5
R
6
V
REF
V
P
For V
IN
=5V, I
OUT
=8A and D=0.5, the I
RMS
=4A
I
RMS
= I
OUT
D
×
(1-D)
---(9)
Where:
D is the Duty Cycle, D=V
OUT
/V
IN.
I
RMS
is the RMS value of the input capacitor current.
I
OUT
is the output current for each channel.
- 1
V
OUT
V
P
Switcher
V
IN
= 5V
V
OUT
= 2.5V
I
OUT
= 8A
V
OUT
= 50mV
f
S
= 200KHz
Linear Regulator
V
IN
= 2.5V
V
OUT
= 1.6V
I
OUT
= 2A
Supply Voltage
V
CC
=V
C
L=V
C
H=12V
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