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參數(shù)資料
| 型號： | PT5816N |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 20 A SWITCHING REGULATOR, 350 kHz SWITCHING FREQ-MAX, MSIP18 |
| 封裝： | SIP-18 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 226K |
| 代理商： | PT5816N |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT5800 & PT5810 Series
Adjusting the Output Voltage of the PT5800 &
PT5810 Step-Down Series of Regulators
Using Margin Up/ Margin Down
The Margin Up* (pin 4) and Margin Dn* (pin 3) control
inputs allow the output voltage to be easily adjusted by
up to ±5 % of the nominal set-point voltage. To activate,
simply connect the appropriate control input to the Sense(–)
(pin 8), or the local starpoint ground. Either a logic level
MOSFET or a p-channel JFET is recommended for this
purpose. For further information see the related applica-
tion note on this feature.
Using the ‘V
o
Adjust’ Control
For a more permanent and precise adjustment, use the
Vo Adjust control (pin 1). The Vo Adjust control allows
adjustment in any increment by up to ±10% of the set-
point. The adjustment method requires the addition of a
single external resistor. Table 5-1 gives the allowable
adjustment range for each model of the series as Va (min)
and Va (max). The value of the external resistor can either
be calculated using the formulas given below, or simply
selected from the range of values provided in Table 5-2.
Refer to Figure 5-1 for the placement of the required
resistor. Use the resistor R1 to adjust up, and the resistor
(R2) to adjust down.
Adjust Up: An increase in the output voltage is obtained
by adding a resistor R1, between Vo Adjust (pin 1) and
Sense(–) (pin 8). See Figure 5-1.
Adjust Down: Add a resistor (R2), between Vo Adjust (pin 1)
and Sense(+) (pin 18). See Figure 5-1.
Figure 5-1; V
o
Adjust Resistor Placement
Vo Adjust Resistor Calculations
The values of R1 [adjust up] and (R2) [adjust down] can
also be calculated using the following formulas. Again, use
Figure 5-1for the placement of the required resistor;
either R1 or (R2) as appropriate.
R1
=
Vr Ro
– 24.9
k
Va – Vo
(R2)
=
Ro (Va – Vr)
– 24.9
k
Vo – Va
Where: Vo = Original output voltage
Va = Adjusted output voltage
Vr = The reference voltage in Table 5-1
Ro = The resistance constant in Table 5-1
Table 5-1
ISR OUTPUT VOLTAGE ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt. No.
5.0V Bus
PT5801
PT5802
PT5803
PT5804
PT5805
PT5806
3.3V Bus
N/A
PT5812 4
PT5813
PT5814
PT5815
PT5816
Vo (nom)
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
1.0 V
Va (min)
2.6 V
2.0 V
1.52 V
1.31 V
1.1 V
0.94 V
Va (max)
3.63 V
2.8 V #
2.1 V
1.82 V
1.52 V
1.32 V
Vr
0.8 V
Ro (k
)
10.2
10.7
10.2
9.76
10.0
10.2
# The PT5812 should not be adjusted higher than its nominal output voltage of 2.5 V. See note 4.
Notes:
1. Use a 1% (or better) tolerance resistor in either the R1 or
(R2) location. Place the resistor as close to the ISR as
possible.
2. Never connect capacitors from Vo Adjust to either GND or
Vout. Any capacitance added to the Vo Adjust pin will affect
the stability of the ISR.
3. If the remote sense feature is not being used, the adjust
resistor (R2) can be connected to Vout, (pins 14-17) instead
of Sense (+).
PT5800/5810
9–13
1
18
14–17
8
C
OUT
330 F
+
GND
V
OUT
Sense (+) [Note 3]
Sense (–)
(R
2)
Adj Down
V
O Adj
GND
Sense(+)
Sense(–)
V
OUT
R
1
Adjust Up
4. The PT5812 may not be adjusted higher than the
nominal output voltage of 2.5 V. There is insufficient
input voltage between Vin and Vout to accommodate
an increase in the output voltage.
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| PT581730 | 制造商:MA-COM 制造商全稱:M/A-COM Technology Solutions, Inc. 功能描述:Miniature Relay |
| PT5820 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:16-A 12-V Input Adjustable Integrated Switching Regulator |
| PT5821 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:16-A 12-V Input Adjustable Integrated Switching Regulator |
| PT5821A | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3.3V 20A 12-V Input Adj Step-Down ISR RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| PT5821C | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3.3V 20A 12-V Input Adj Step-Down ISR RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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