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參數(shù)資料
| 型號(hào)： | IRU3072C |
| 廠商： | International Rectifier |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 20-PIN SYNCHRONOUS PWM CONTROLLER/ 3 LDO CONTROLLER |
| 中文描述： | 20引腳同步PWM控制器/ 3 LDO控制器 |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 332K |
| 代理商： | IRU3072C |
IRU3072
7
Rev. 1.0
3/25/04
www.irf.com
The IRU3072 controller IC is designed to provide a low
cost synchronous Buck regulator for on-board DC to DC
converter as well as three linear regulator controllers. It
is specially designed for multiple output applications.
The outputs can be programmed as low as 0.8V.
The IRU3072 provides two separate soft-starts. It not
only allows different output power sequences, but also
allows shutdown of LDO and PWM output regulators
individually.
The IRU3072 provides cycle-by-cycle current limit and
output feedback under-voltage lockout.
Power Sequence and Under-Voltage Lockout
For correct operation, proper power sequence should be
ensured. Typically, there are four or five input voltages
involved.
The power sequence should be proper such that soft-
start capacitors (for both LDO and PWM) start to be
linearly charged up right after the above five voltages enter
into steady state, as shown in the following figure.
Figure 4 - Desired power sequence.
Vcc: IC biasing voltage.
V
SEN33
: LDO Input voltage, for example 3.3V
VccLDO: Input biasing voltage for IRU3072 internal
LDO controller.
V
BUS
: Input voltage for synchronous buck converter.
Vc: Input biasing voltage for IRU3072 internal high
side MOSFET drivers.
V
BUS
= Vcc = 5V
Vc = VccLDO created by charge pump
V
SEN33
= 3.3V
APPLICATION INFORMATION
The IRU3072 senses four voltages with under-voltage
lockout (UVLO) block. The voltages Vcc, Vc and VccLDO
are sensed through the UVLO block. The LDO input volt-
age can be sensed through pin V
SEN33
. Although syn-
chronous bus voltage (V
BUS
) is not sensed, in practical,
it can be sensed indirectly. Typically, only two or three
input voltages are available. Some of the five input volt-
ages have to either share or be generated by another
method such as charge pump. One example of IRU3072
application with only two input voltages, 5V and 3.3V, is
shown in figure 5. In this example:
The IRU3072 will sense all four voltages to ensure all
these voltages enter into steady state before the soft-
start capacitor is charged up. The operation waveforms
are shown in Figure 6.
Figure 5 - IRU3072 application with only two
power inputs: 5V and 3.3V.
Input Voltage
V
CC
,V
CC
LDO,
V
BUS
,Vc, etc
UVLO Threshold Voltage
Soft-Start Voltage
for PWM V
SS
Soft-Start Voltage
for LDO V
SS
LDO
IRU3072
U1
Vcc
Vc
HDrv
LDrv
V
OUT1
OCSet
V
SEN33
/ SDB
C6
C10
L1
Q4
Q5
R7
VccLDO
V
BUS
=5V
UVLO
3.3V
Drv2
Fb2
Soft-Start
SS1
SS
LDO
L2
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|---|---|
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