參數(shù)資料
型號(hào)： TPS65170RHDT
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 4.2 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC28
封裝： 5 X 5 MM, GREEN, PLASTIC, QFN-28
文件頁(yè)數(shù)： 7/35頁(yè)
文件大小： 4698K
代理商： TPS65170RHDT
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www.ti.com
SLVSA27 – OCTOBER 2009
Output Capacitance Selection (Boost Converter)
For best performance, a total output capacitance (COUTA+COUTB in Figure 24) in the range 50F to 100F is
recommended. At least 20F of the total output capacitance should be connected directly to the cathode of the
boost converter's rectifier diode, i.e., in front of the isolation switch.
Operating the boost converter with little or no capacitance in front of the isolation switch may cause overvoltage
conditions that reduce reliability of the TPS65170.
Table 3 suggests some output capacitors suitable for use with the boost converter.
Table 3. Boost Converter Output Capacitor Selection
PART NUMBER
VALUE / VOLTAGE RATING
COMPONENT SUPPLIER
GRM32ER61E226KE15
22 F / 25V
Murata
GRM31CR61E106KA12
10 F / 25V
Murata
UMK325BJ106MM
10 F / 50V
Taiyo Yuden
Setting the Output Voltage (Boost Converter)
The boost converter's output voltage is programmed by a resistor divider according to Equation 7.
(7)
Where VREF is the IC's internal 1.24V reference.
A current of the order of 100A through the resistor network ensures good accuracy and improves noise
immunity. A good approach is to assume a value of about 12k for the lower resistor (R2) and then select the
upper resistor (R1) to set the desired output voltage.
Compensation (Boost Converter)
The boost converter's external compensation can be fine-tuned for each individual application. Recommended
starting values are 33k
Ω and 1nF, which introduce a pole at the origin for high DC gain and a zero for good
transient response. The frequency of the zero set by the compensation components can be calculated using
(8)
Selecting the Soft-Start Capacitor (Boost Converter)
The boost converter features a programmable soft-start function that ramps up the output voltage to limit the
inrush current drawn from the supply voltage. The soft-start duration is set by the capacitor connected between
the SS pin and AGND according to Equation 9.
(9)
Where CSS is the capacitor connected between the SS pin and GND, VREF is the IC's internal 1.24V reference,
and ISS is the internally generated 10A soft-start current.
Selecting the Isolation Switch Gate Drive Components
The isolation switch is controlled by an active-low signal generated by the GD pin. Because this signal is
open-drain, an external pull-up resistor is required to turn the MOSFET switch off. If the MOSFET's maximum
gate-source voltage rating is less than the maximum VIN, two resistors in series can be used to reduce the
maximum VGS applied to the device. The exact value of the gate drive resistors is not critical: 100k for both is a
good value to start with.
Copyright 2009, Texas Instruments Incorporated
15
Product Folder Link(s) :TPS65170
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