參數(shù)資料
型號(hào)： TPS65161PWPRG4
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, PDSO28
封裝： GREEN, PLASTIC, HTSSOP-28
文件頁(yè)數(shù)： 11/34頁(yè)
文件大?。?/td> 847K
代理商： TPS65161PWPRG4
Vin
D = 1 -
Vout
Iavg + (1 * D)
lsw +
Vin
Vout
2.8 A with lsw + minimum switch current of the TPS65161 (2.8 A).
Vout + 1.146 V
1 )
R1
R2
C
+
1
2
p
z R1
+
1
2
p
10 kHz
R1
z +
1
2
p
Cc
Rc
www.ti.com ............................................................................................................................................... SLVS617D – APRIL 2006 – REVISED SEPTEMBER 2009
Table 3. Output Capacitor Selection (Boost Converter)
CAPACITOR
VOLTAGE RATING
COMPONENT SUPPLIER
22
μF/1812
16 V
Taiyo Yuden EMK432BJ226MM
Rectifier Diode Selection (Boost Converter)
To achieve high efficiency, a Schottky diode should be used. The reverse voltage rating should be higher than
the maximum output voltage of the converter. The average rectified forward-current rating needed for the
Schottky diode is calculated as the off-time of the converter times the maximum switch current of the TPS65161:
Usually, a Schottky diode with 2-A maximum average rectified forward-current rating is sufficient for most
applications. Secondly, the Schottky rectifier has to be able to dissipate the power. The dissipated power is the
average rectified forward current times the diode forward voltage.
PD = Iavg × VF = Isw × (1 - D) × VF (with Isw = minimum switch current of the TPS65161 (2.8 A).
Table 4. Rectifier Diode Selection (Boost Converter)
CURRENT RATING
Vr
Vforward
RθJA
SIZE
COMPONENT SUPPLIER
Iavg
3 A
20 V
0.36 at 3 A
46°C/W
SMC
MBRS320, International Rectifier
2 A
20 V
0.44 V at 3 A
75°C/W
SMB
SL22, Vishay Semiconductor
2 A
20 V
0.5 at 2 A
75°C/W
SMB
SS22, Fairchild Semiconductor
Setting the Output Voltage and Selecting the Feedforward Capacitor (Boost Converter)
The output voltage is set by the external resistor divider and is calculated as:
Across the upper resistor, a bypass capacitor is required to achieve a good load transients response and to have
a stable converter loop. Together with R1, the bypass capacitor C sets a zero in the control loop. Depending
on the inductor value, the zero frequency needs to be set. For a 6.8-
μH or 10-μH inductor, fz = 10 kHz and for a
22-
μH inductor, fz = 7 kHz.
A value coming closest to the calculated value should be used.
Compensation (COMP) (Boost Converter)
The regulator loop can be compensated by adjusting the external components connected to the COMP pin. The
COMP pin is the output of the internal transconductance error amplifier. A single capacitor connected to this pin
sets the low-frequency gain. Usually, a 22-nF capacitor is sufficient for most of the applications. Adding a series
resistor sets an additional zero and increases the high-frequency gain. The following formula calculates at what
frequency the resistor increases the high-frequency gain.
Lower input voltages require a higher gain and therefore a lower compensation capacitor value.
Copyright 2006–2009, Texas Instruments Incorporated
19
Product Folder Link(s): TPS65161 TPS65161A TPS65161B
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