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参数资料
| 型号： | APW7066QAC-TRL |
| 厂商： | ANPEC ELECTRONICS CORP |
| 元件分类： | 稳压器 |
| 英文描述： | Dual Synchronous Buck PWM Controllers and One Linear Controller |
| 中文描述： | SWITCHING CONTROLLER, QCC32 |
| 封装： | 5 X 5 MM, LEAD FREE, QFN-32 |
| 文件页数： | 13/33页 |
| 文件大小： | 338K |
| 代理商： | APW7066QAC-TRL |
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Copyright
ANPEC Electronics Corp.
Rev. A.7 - Mar., 2008
APW7066
20
Function Description
Operational Modes
The APW7066 has two independent synchronous buck
converters, and it also has DDR mode operation to
allow VOUT2 to track VOUT1.
In independent mode operation, connect a capacitor
from each SS/EN pin to the ground to set each
regulator
’s soft-start time. The 3.3V reference VREF
can be used directly, or divided by two resistors for
REFIN, since the VREF is controlled by the SS2/EN2.
DDR mode is chosen by connecting the SS2/EN2 pin
to VCC(5V). In this mode, SS2/EN2 function will be
disabled, SS1/EN1 is used to control soft start and
enable both VOUT1 and VOUT2. The VOUT1 is used
as the REFIN for the VOUT2, that makes VOUT2 to
track VOUT1.
VREF
RE F IN
SS 3 /EN3
SS 2 /EN2
SS 1 /EN1
G ND
Figure 1. Independent Mode Circuit
REFIN
SS3/EN3
SS2/EN2
SS1/EN1
GND
VOUT1
VCC
Figure 2.DDR Mode Circuit
Phase Shift
The APW7066 has phase shift function, use the
REFOUT pin to select the phase shift between
Independent mode and DDR mode. Connect the
REFOUT to VCC to get the 0 degre in either mode. In
this case, the buffer of the REFOUT is disabled. Leave
the REFOUT open shifts the phase 90 degrees in DDR
mode, or 180 degrees in Independent mode, REFOUT
can be used in this case ( see Table 1.).
MODE
SS2/EN2
REFOUT REFIN
PHASE SHIFT
CH1/CH2
DDR
VCC
VOUT1
0 deg
DDR
VCC
Open
VOUT1
90 deg
SS1/EN1 for CH1
and CH2
Independent
SS2 cap
VCC
VREF
0 deg
Independent
SS2 cap
Open
VREF
180 deg
SS1/EN1 for CH1
SS2/EN2 for CH2
Table1.Mode and Phase Selection
The advantage of Phase shift is to avoid overlapping
the switching current spikes of the two channels, or
interaction between the channels; it also reduces the
RMS current of the input capacitors, allowing fewer
caps to be employed. However, the phase shift
between the rising edge of LGATE1 and LGATE2 (See
figure 3.), depending on the duty cycles, the falling
edges of the two channels might overlap; so the user
should check it.
Figure 3. Phase of LG2 with respect
to rising edge of LG1
0
90
1800
LG1
LG2
(0deg)
LG2
(90deg)
LG2
(180deg)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| APW7066QAC-TU | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Dual Synchronous Buck PWM Controllers and One Linear Controller |
| APW7066QAC-TUL | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Dual Synchronous Buck PWM Controllers and One Linear Controller |
| APW7066RC-TR | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Dual Synchronous Buck PWM Controllers and One Linear Controller |
| APW7066RC-TRG | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Dual Synchronous Buck PWM Controllers and One Linear Controller |
| APW7066RC-TRL | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Dual Synchronous Buck PWM Controllers and One Linear Controller |
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