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參數(shù)資料
| 型號(hào)： | TPS65162RGZR |
| 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, PQCC48 |
| 封裝： | 7 X 7 MM, PLASTIC, VQFN-48 |
| 文件頁數(shù)： | 18/36頁 |
| 文件大?。?/td> | 1034K |
| 代理商： | TPS65162RGZR |
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Setting the Output Voltage
Vout + 1.265 V
1 )
R5
R6
(9)
Cz +
1
2
p
135kHz
R5
+
1
2
p
135kHz
2.5kW
+ 471.6 pF [ 470 pF
(10)
Inductor Selection
DIL + Vout
1 *
Vout
Vin
L
I
Lmax + Ioutmax )
DIL
2
(11)
www.ti.com ............................................................................................................................................................... SLVS771B – MAY 2007 – REVISED JUNE 2008
The step-down converter uses an external voltage divider to set the output voltage. The output voltage is
calculated as:
At load currents <1 mA, the device operates in discontinuous conduction mode. When the load current is
reduced to zero the output voltage rises slightly above the nominal output voltage. At zero load current, the
device skips clock cycles, but does not completely stop switching, thus the output voltage sits slightly above the
nominal output voltage. Therefore, the lower feedback resistor is selected to be around 1.2 k
to maintain
around 1 mA minimum load current.
Selecting the Feedforward Capacitor
The feedforward capacitor across the upper feedback resistor divider forms a zero around 135 kHz, and is
calculated as:
Usually the standard capacitor value closest to the calculated value is selected.
The TPS65162 step-down converter typically operates with a 10-
H inductor. For high efficiency, the inductor
should have a low DC resistance to minimize conduction loss. This must be considered when selecting the
appropriate inductor. In order to avoid inductor saturation, the inductor should be rated at least for the maximum
output current of the converter plus the inductor ripple current that will be calculated by:
where
= Switching Frequency (750 kHz, 500 kHz minimal)
L = Inductor Value (typically 10
H)
ΔIL= Peak to Peak inductor ripple current
ILmax = Maximum Inductor current
The highest inductor current occurs at maximum Vin. A more conservative approach is to select the inductor
current rating just for the typical switch-current limit of 3.5 A.
Table 5. Inductor Selection
INDUCTOR VALUE
COMPONENT SUPPLIER
DIMENSIONS in mm
Isat/DCR
10
H
Coilcraft DO3316P-103
12.95 × 9.4 × 5.51
3.9 A/38 m
10
H
Sumida CDRH8D43-100
8.3 × 8.3 × 4.5
4.0 A/29 m
10
H
Wuerth Elektronik 744066100
10 × 10 × 3.8
4.0 A/25 m
Copyright 2007–2008, Texas Instruments Incorporated
25
Product Folder Link(s): TPS65162
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