参数资料
型号: TPS40130RHBRG4
厂商: TEXAS INSTRUMENTS INC
元件分类: 稳压器
英文描述: SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC32
封装: GREEN, PLASTIC, QFN-32
文件页数: 7/38页
文件大小: 950K
代理商: TPS40130RHBRG4
www.ti.com
Setting Overcurrent Protection
V
ILIM + 2.7
I
PH(max)
R
CS
(7)
I
PH(max) +
I
OUT
2
)
V
IN * VOUT
V
OUT
2
L
OUT
f
SW
V
IN
(8)
Resistor Divider Calculation for VOUT, ILIM, OVSET and UVLO
R
BIAS + 0.7
R1
V
OUT * 0.7
(9)
R6 + R5
V
ILIM
0.7 * VILIM
(10)
R4 + 0.812
R3
V
OUT(ov) * 0.812
(11)
R8 + 1.0
R7
V
IN * 1.0
(12)
Feedback Loop Compensation
f
OP +
1
2p
R
OUT
C
OUT
(13)
f
ESRZ +
1
2p
R
ESR
C
OUT
(14)
SLUS602B – JUNE 2004 – REVISED SEPTEMBER 2005
Setting the overcurrent protection is given in the following equations. Care must be taken when calculating VILIM
to include the increase in RCS caused by the output current as it approaches the overcurrent trip point. The DCR
(RCS in the equation) of the inductor increases approximately 0.39% per degree Centigrade.
where
I
PH(max) is a maximum value of the phase current allowed
I
OUT is the total maximum DC output current
L
OUT is the output inductor value
f
SW is the switching frequency
V
OUT is the output voltage
V
IN is the input voltage
R
CS is a value of the current sense resistor used or the DCR value of the output inductor, LOUT
Use Figure 9 for setting the output voltage, current limit voltage and overvoltage setting voltage. Select RBIAS
using Equation 9. With a voltage divider from VREF, select R6 using Equation 10. WIth a voltage from DIFFO
select R4 using Equation 11. With a voltage divider from VIN, select R8 using Equation 12.
The TPS40130 operates in a peak-current mode and the converter exhibits a single pole response with ESR
zero for which Type II compensation network is usually adequate as shown in Figure 5.
The load pole is situated at a value calculated using Equation 13.
and the ESR zero is situated at a value calculated using Equation 14.
To achieve the desired bandwidth the error amplifier has to compensate for modulator gain loss at the crossover
frequency. A zero placed at the load pole frequency facilitates that. The ESR zero alters the modulator -1 slope
at higher frequencies. To compensate for the ESR zero, a pole in the error amplifier transfer function should be
placed at the ESR zero frequency.
15
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