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參數資料
| 型號： | TPS65170RHDT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 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 |
| 文件頁數： | 5/35頁 |
| 文件大小： | 4698K |
| 代理商： | TPS65170RHDT |
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SW
FB
V
IN
V
S
COMP
SS
GD
R
1
R
2
R
COMP
C
OUTB
C
OUTA
C
IN
C
COMP
C
SS
IN
S
V
η
D = 1
V
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www.ti.com
SLVSA27 – OCTOBER 2009
Figure 24. Boost Converter Typical Application Circuit
PROTECTION (BOOST CONVERTER)
The boost converter is protected against potentially damaging conditions such as overvoltage and short circuits.
An error condition is detected if the voltage on the converter's FB pin remains below 200mV for longer than
1.36ms, in which case, the converter stops switching and is latched in the OFF condition. To resume normal
operation, the TPS65170 must be turned off and then turned on again.
Note: since the positive charge pump is driven from its switch node, an error condition on the boost converter's
output will also cause the loss of VGH until the circuit recovers.
The boost converter also stops switching while the positive charge pump is in a short circuit condition. This
condition is not latched, however, and the boost converter automatically resumes normal operation once the
short circuit condition has been removed from the positive charge pump.
BOOST CONVERTER DESIGN PROCEDURE
Calculate Converter Duty Cycle (Boost Converter)
The simplest way to calculate the boost converter's duty cycle is to use the efficiency curve in Figure 1 to
determine the converter's efficiency under the anticipated load conditions and insert this value into Equation 2 (1).
Alternatively, a worst-case value (e.g., 90%) can be used for efficiency.
(2)
A.
Valid only when boost converter operates in CCM.
Where VS is the output voltage of the boost converter.
Copyright 2009, Texas Instruments Incorporated
13
Product Folder Link(s) :TPS65170
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