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参数资料
| 型号： | IR3080MTR |
| 厂商： | International Rectifier |
| 英文描述： | XPHASE VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT |
| 中文描述： | XPHASE VRD10控制集成电路VCCVID |
| 文件页数： | 24/41页 |
| 文件大小： | 2267K |
| 代理商： | IR3080MTR |
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IR3080
Combined Over Temperature and Phase Delay Setting Resistors
R
PHASE1
,
R
PHASE2
and
R
PHASE3
The over temperature setting resistor divider can be combined with the phase delay resistor divider to save one
resistor per phase.
Calculate the HOTSET threshold voltage V
HOTSET
corresponding to the allowed maximum temperature from
Equation (23). If the over temperature setting voltage is lower than the phase delay setting voltage,
VBIAS*RA
PHASEx
, connect RMPIN+ or RMPIN- pin between R
PHASEx1
and
R
PHASEx2,
and
connect HOTSET pin
between
R
PHASEx2
and R
PHASEx3
. Pre-select R
PHASEx1
,
*
)
(
2
PHASEx
BIAS
RA
V
R
V
R
If the over temperature setting voltage is higher than the phase delay setting voltage, VBIAS*RA
PHASEx
, connect
HOTSET pin between R
PHASEx1
and
R
PHASEx2
and
connect RMPIN+ or RMPIN- between
R
PHASEx2
and R
PHASEx3
respectively. Pre-select R
PHASEx1
,
V
RA
V
R
R
V
RA
R
Bootstrap Capacitor
C
BST
Depending on the duty cycle and gate drive current of the phase IC, a 0.1uF to 1uF capacitor is needed for the
bootstrap circuit.
Decoupling Capacitors for Phase IC
0.1uF-1uF decoupling capacitors are required at VCC and VCCL pins of phase ICs.
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 extra zero to the voltage loop and splits the double poles of the power stage, which make the voltage
loop compensation much easier.
Resistors R
FB
and R
DRP
are chosen according to Equations (16) and (17), and the selection of compensation types
depends on the output capacitors used in the converter. For the applications using Electrolytic, Polymer or AL-
Polymer capacitors and running at lower frequency, type II compensation shown in Figure 17(a) is usually enough.
While for the applications using only ceramic capacitors and running at higher frequency, type III compensation
shown in Figure 17(b) is preferred.
For applications where AVP is not required, the compensation is the same as for the regular voltage mode control.
For converter using Polymer, AL-Polymer, and ceramic capacitors, which have much higher ESR zero frequency,
type III compensation is required as shown in Figure 17(b) with R
DRP
and C
DRP
removed.
)
1
1
PHASEx
R
HOTSET
V
BIAS
V
PHASEx
RA
PHASEx
R
=
(26)
)
1
*
1
3
PHASEx
RA
BIAS
V
PHASEx
HOTSET
PHASEx
=
(27)
HOTSET
BIAS
PHASEx
BIAS
PHASEx
HOTSET
PHASEx
V
V
R
=
1
2
)
(
(28)
HOTSET
V
BIAS
V
PHASEx
BIAS
PHASEx
PHASEx
=
1
3
*
(29)
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 Equations (30) and (31), where L
E
and C
E
are the equivalent inductance of output inductors and the equivalent capacitance of output capacitors
respectively.
Page 24 of 41
9
/30/04
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相关代理商/技术参数 |
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| IR3080MTRPBF | 功能描述:开关变换器、稳压器与控制器 XPHASE VRD10 CTRL IC CTRL IC 200 to 700mV 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 |
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| IR3081A | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM VR 10 CONTROL IC |
| IR3081AM | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM VR 10 CONTROL IC |
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