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參數資料
| 型號： | TPS65167RHAT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 4.9 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, QFN-40 |
| 文件頁數： | 17/41頁 |
| 文件大小： | 1270K |
| 代理商： | TPS65167RHAT |
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Output Capacitor Selection (step-down converter)
Positive Charge Pump
SUP
SUP = Vs
Softstart
Q4
Q5
Q6
ControlLogic
Automatic
Gainselect
(doubleror
triplermode)
D0
D1
D3
D2
C1N
C1P
POUT
C2P
C2N
FBP
Vref
1.213V
OSC
750kHz
Q3
PGND
I
DRVP
Vout + 1.213 V
1 )
R4
R5
(11)
R4 + R5
Vout
V
FB
* 1 + R5
Vout
1.213 *
1
(12)
SLVS760C – APRIL 2007 – REVISED MARCH 2008
The device is designed to work with ceramic output capacitors. Two 22-
F output capacitors are sufficient for
most of the applications. Larger output capacitance improves the load transient response.
Table 10. Output Capacitor Selection step-down Converter
CAPACITOR
VOLTAGE RATING
COMPONENT SUPPLIER
2
× 22 F/6.3 V
6.3 V
Taiyo Yuden JMK212BJ226MG
The positive charge pump is a fully integrated charge pump switching automatically its gain between doubler and
tripler mode. As shown in Figure 26, the input voltage of the positive charge pump is the SUP pin, that is
connected to the output of the main boost converter Vs.
Figure 26. Positive Charge Pump Block Diagram
The charge pump requires two 330 nF flying capacitors and a 1
F output capacitance for stable operation. The
positive charge pump also supports a high voltage stress test by pulling the HVS pin high. This programs the
output voltage to a fixed output voltage of 30 V (TPS65167 only) by using a internal voltage divider. The
TPS65167A has this function disabled. In normal operation the HVS pin is pulled low and the output voltage is
programmed with the external voltage divider.
To minimize noise and leakage current sensitivity, keeping the lower feedback divider resistor R5 in the 20 k
range is recommended. A 100 pF feed-forward capacitor across the upper feedback resistor R4 is typically
required. For the capacitor selection, see Table 11.
24
Copyright 2007–2008, Texas Instruments Incorporated
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