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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 8/34頁 |
| 文件大?。?/td> | 847K |
| 代理商： | TPS65161PWPRG4 |
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Vout + 1.213
1 )
R5
R6
R5 + R6
Vout
V
FB
* 1 + R6
Vout
1.213 *
1
Vout + *VREF
R3
R4
+ * 1.213 V
R3
R4
R3 + R4
|Vout|
V
REF
+ R4
|Vout|
1.213
EN2
EN1
GD
V
(LOGIC)
V
GL
DLY1
V
S
V
GH
DLY2
V
IN
V
IN
V ,
S VGH
FallTimeDependsonLoad
CurrentandFeedbackResistor
SLVS617D – APRIL 2006 – REVISED SEPTEMBER 2009 ............................................................................................................................................... www.ti.com
Negative Charge Pump
The negative charge pump provides a regulated output voltage set by the external resistor divider. The negative
charge pump operates similar to the positive charge pump with the difference that it runs from the input voltage
VIN. The negative charge pump driver inverts the input voltage. The maximum negative output voltage is VGL =
(–VIN) + Vdrop. Vdrop is the voltage drop across the external diodes and internal charge-pump MOSFETs. In case
VGL needs to be lower than –VIN, an additional charge-pump stage needs to be added.
Setting the output voltage:
The lower feedback resistor value, R4, should be in a range between 40 k
to 120 k or the overall feedback
resistance should be within 500 k
to 1 M. Smaller values load the reference too heavily, and larger values
may cause stability problems. The negative charge pump requires two external Schottky diodes. The peak
current rating of the Schottky diode has to be twice the load current of the output. For a 20-mA output current,
the dual-Schottky diode BAV99 is a good choice.
Power-On Sequencing (EN1, EN2, DLY1, DLY2)
The TPS65161 has an adjustable power-on sequencing set by the capacitors connected to DLY1 and DLY2 and
controlled by EN1 and EN2. Pulling EN1 high enables the step-down converter and then the negative
charge-pump driver. DLY1 sets the delay time between the step-down converter and negative charge-pump
driver. EN2 enables the boost converter and positive charge-pump driver at the same time. DLY2 sets the delay
time between the step-down converter V(LOGIC) and the boost converter VS. This is especially useful to adjust the
delay when EN2 is always connected to VIN. If EN2 goes high after the step-down converter is already enabled,
Figure 17. Power-On Sequencing With EN2 Always High (EN2 = VIN)
16
Copyright 2006–2009, Texas Instruments Incorporated
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