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参数资料
| 型号： | IR3500MTRPBF |
| 厂商： | International Rectifier |
| 英文描述： | XPHASE3TM VR11.0 & AMD PVID CONTROL IC |
| 中文描述： | XPHASE3TM VR11.0 |
| 文件页数： | 33/47页 |
| 文件大小： | 778K |
| 代理商： | IR3500MTRPBF |
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IR3500
Page 33 of 47
June 12, 2007
)]
1
1
(
*
[
*
_
_
ROOM
MAX
L
THERM
B
THERM
R
TMAX
R
T
T
EXP
=
(22)
Select the series resistor R
HOTSET2
to linearize the NTC thermistor, which has non-linear characteristics in the
operational temperature range. Then calculate R
HOTSET1
corresponding to the allowed maximum temperature
TMAX from (23).
*
)
(
2
1
=
R
HOTSET
6
)
(
+
VCCL
R
R
HOTSET
TMAX
(23)
VOLTAGE LOOP COMPENSATION
The adaptive voltage positioning (AVP) is usually adopted in the computer applications to improve the transient
response and reduce the power loss at heavy load. Like current mode control, the adaptive voltage positioning
loop introduces an extra zero to the voltage loop and splits the double poles of the power stage, which makes the
voltage loop compensation much easier.
Adaptive voltage positioning lowers the converter voltage by R
O
*I
O,
where R
O
is the
required
output impedance of
the converter. Pre-select feedback resistor R
FB,
and calculate the droop resistor RDRP,
G
R
R
R
O
CS
MAX
R
L
FB
DRP
n
=
*
_
(25)
The selection of compensation types depends on the output capacitors used in the converter. For applications
using Electrolytic, Polymer or AL-Polymer capacitors and running at lower frequency, type II compensation shown
in Figure 22(a) is usually enough. While for the applications using only ceramic capacitors and running at higher
frequency, type III compensation shown in Figure 22(b) is preferred.
For applications where AVP is not required, the compensation is the same as for the regular voltage mode
control. For converters using Polymer, AL-Polymer, and ceramic capacitors, which have much higher ESR zero
frequency, type III compensation is required as shown in Figure 22(b) with R
DRP
and C
DRP
removed.
RCP
CCP1
EAOUT
CCP
RFB
RDRP
VO+
VDRP
VDAC
+
-
EAOUT
FB
CFB
CDRP
RCP
EAOUT
CCP1
CCP
RFB
RDRP
VO+
VDRP
VDAC
FB
+
-
EAOUT
RFB1
(a) Type II compensation
(b) Type III compensation
Figure 22 - Voltage loop compensation network
Type II Compensation for AVP Applications
Determine the compensation at no load, the worst case condition. Choose the crossover frequency fc between
1/10 and 1/5 of the switching frequency per phase. Assume the time constant of the resistor and capacitor across
the output inductors matches that of the inductor, and determine R
CP
and C
CP
from (26) and (27), where L
E
and
C
E
are the equivalent inductance of output inductors and the equivalent capacitance of output capacitors
respectively.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3500V | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC |
| IR3500VMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC |
| IR3500VMTRPBF | 功能描述:开关变换器、稳压器与控制器 X-PHASE IR3500V AMD SVID CTRL IC RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IR3502 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM CONTROL IC |
| IR3502_09 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM CONTROL IC |
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