参数资料
型号: TPS51221RTVRG4
厂商: TEXAS INSTRUMENTS INC
元件分类: 稳压器
英文描述: DUAL SWITCHING CONTROLLER, 333 kHz SWITCHING FREQ-MAX, PQCC32
封装: 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件页数: 21/39页
文件大小: 829K
代理商: TPS51221RTVRG4
INDUCTOR DCR CURRENT SENSING
Co
Lx
Rs(DCR)
+
Cx
Rx
CSP
CSN
Inductor
Rc1
Rc2
R
NTC
Co
Lx
VIN
Rs(DCR)
+
Cx
Rx
Control
logic
&
Driver
DRVH
DRVL
CSP
CSN
Inductor
Rc
Cx
Rx
Rc +
Lx
Rs
(17)
I
OCL(PEAK) + VOCL
1
Rs
Rx ) Rc
Rc
(18)
SLVS786A – NOVEMBER 2007 – REVISED MARCH 2009............................................................................................................................................... www.ti.com
To use an inductor DCR as current sensing resistor (Rs), the configuration needs to change, as shown in
Figure 44. However, the equation must be satisfied the same as the one using resistor sensing.
Figure 44. Inductor DCR Current Sensing
Figure 45. Inductor DCR Current Sensing With Voltage Divider
The TPS51221 has a fixed VOCL point (60 mV or 30 mV). In order to adjust for DCR, a voltage divider can be
configured as shown in Figure 45.
For Rx, Rc and Cx can be determined as below, and over-current limitation value can be calculated as follows.
Figure 50 shows the compensation technique for the temperature drifts of the inductor DCR value. This scheme
assumes the temperature rise at the thermistor (RNTC) is directly proportional to the temperature rise at the
inductor.
28
Copyright 2007–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS51221
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