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參數(shù)資料
| 型號： | TPS6755Y |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 160 kHz SWITCHING FREQ-MAX, UUC8 |
| 封裝： | DIE-8 |
| 文件頁數(shù)： | 3/17頁 |
| 文件大?。?/td> | 265K |
| 代理商： | TPS6755Y |
TPS6755
ADJUSTABLE INVERTING DC/DC CONVERTER
SLVS155A – NOVEMBER 1996 REVISED DECEMBER 1996
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Figure 13
Soft-Start
Delay
–
ms
SOFT-START DELAY
vs
CAPACITANCE
C – Capacitance –
F
50
40
20
0
0.2
0.4
0.6
0.8
1
60
80
90
1.2
1.4
1.6
C6 varied
(see Figure 7)
VI = 2.7 V
VI = 5 V
VI = 7 V
70
30
10
Figure 14
–
Drain-Source
On-State
Resistance
–
DRAIN-SOURCE ON-STATE RESISTANCE
vs
TEMPERATURE
r
DS(on)
T – Temperature –
°C
0.3
0.2
0.1
0
–40 –20
0
20
40
60
0.5
0.6
0.7
80
100
120 140
0.4
VI = 7 V
VI = 2.7 V
VI = 5 V
The TPS6755 operates in the voltage-inverting circuit, shown in Figure 15, which can generate an output. The
circuit is ideal for applications that require a negative polarity voltage on the output with respect to the input
ground, and for energy management systems. The TPS6755 can be placed in a shutdown mode (1-
A
quiescent current) by forcing EN low.
soft start
The soft-start capacitor provides an orderly start-up of the converter by slowly increasing the switch current limit
during power-up. The soft-start timing is controlled by the SS capacitance (see Figure 13 for the capacitance
value corresponding to the desired delay time). The switch current limit is proportional to the voltage applied
to SS, which is internally pulled to REF by a 1.2-M
resistor. SS can be externally pulled lower than REF to limit
the switch current. A UVLO condition or an overcurrent condition initiates an SS cycle by discharging the SS
capacitor to ground through an internal transistor. A minimum of a 10-nF capacitor must be connected to SS
to current limit correctly.
inductor selection
The standard 10-
H inductor required by the TPS6755 must have a saturation current greater than the peak
switch current at the desired maximum load. Operation over the full voltage range and current range is assured
by the 10-
H inductor. To determine the required inductor staturation level, refer to the typical operating
characteristics graph for peak inductor current versus load current (see Figure 8).
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