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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： | 22/41页 |
| 文件大小： | 2267K |
| 代理商： | IR3080MTR |
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IR3080
No Load Output Voltage Setting Resistor
R
FB
and Adaptive Voltage Positioning Resistor
R
DRP
A resistor between FB pin and the converter output is used to create output voltage offset V
O_NLOFST,
which is the
difference between V
DAC
voltage and output voltage at no load condition. Adaptive voltage positioning further
lowers the converter voltage by R
O
*I
O,
where R
O
is the
required
output impedance of the converter.
R
FB
is not only determined by I
FB
, the current flowing out of FB pin as shown in Figure 14, but also affected by the
adaptive voltage positioning resistor R
DRP
and total input offset voltage of
current sense amplifiers. R
FB
and R
DRP
are determined by (16) and (17) respectively,
V
V
R
R
_
G
R
R
R
Control IC Over Temperature Setting Resistors R
HOTSETC1
and R
HOTSETC2
The threshold voltage of VRHOT comparator is proportional to the die temperature T
J
(oC) of control IC IR3080, as
shown in Equation (18). Determine the relationship between the die temperature of IR3080 and the temperature of
the power converter according to the power loss, PCB layout and airflow, etc. Then calculate the VRHOT threshold
voltage corresponding to the temperature.
241
.
*
10
*
73
.
+
=
J
VRHOT
T
V
Use VBIAS as the reference voltage. If R
HOTSETC1
is pre selected, R
HOTSETC2
can be calculated according to
Equation (19).
V
R
R
+
Body Braking
TM
Related Resistors
R
BBFB
and
R
BBDRP
The body braking
TM
during Dynamic VID can be disabled by connecting BBFB pin to ground. If the feature is
enabled, Resistors R
BBFB
and R
BBDRP
are needed to restore the feedback voltage of the error amplifier after
Dynamic VID step down. Usually R
BBFB
and R
BBDRP
are chosen to match R
FB
and R
DRP
respectively
.
IR3086 EXTERNAL COMPONENTS
PWM Ramp Resistor
R
PWMRMP
and Capacitor C
PWMRMP
PWM ramp is generated by connecting the resistor R
PWMRMP
between
a voltage source and PWMRMP pin as well
as the capacitor C
PWMRMP
between PWMRMP and LGND. Choose the desired PWM ramp magnitude V
PWMRMP
and the capacitor C
PWMRMP
in the range of 100pF and 470pF, and then calculate the resistor R
PWMRMP
from
Equation (20). To achieve feed-forward voltage mode control, the resistor R
RAMP
should be connected to the input
of the converter.
MAX
L
FB
O
TOFST
CS
NLOFST
I
O
MAX
L
FB
R
R
n
_
_
_
=
(16)
O
MIN
CS
MAX
n
L
FB
DRP
R
=
_
_
(17)
3
(18)
VRHOT
V
VBIAS
V
VRHOT
HOTSETC
HOTSETC
=
1
2
(19)
)]
ln(
)
[ln(
*
*
*
PWMRMP
V
DAC
V
IN
DAC
V
IN
PWMRMP
SW
IN
O
PWMRMP
R
V
V
C
f
V
V
=
(20)
Inductor Current Sensing Capacitor
C
CS+
and Resistors
R
CS+
and
R
CS-
The DC resistance of the inductor is utilized to sense the inductor current. Usually the resistor R
CS+
and capacitor
C
CS+
in parallel with the inductor are chosen to match the time constant of the inductor, and therefore the voltage
across the capacitor C
CS+
represents the inductor current. If the two time constants are not the same, the AC
component of the capacitor voltage is different from that of the real inductor current. The time constant mismatch
does not affect the average current sharing among the multiple phases, but affect the current signal ISHARE as well
as the output voltage during the load current transient if adaptive voltage positioning is adopted.
Page 22 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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