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參數(shù)資料
| 型號： | PT5827A |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 16 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA18 |
| 封裝： | HORIZONTAL MOUNT PACKAGE-18 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 207K |
| 代理商： | PT5827A |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT5820 Series
Adjusting the Output Voltage of the
PT5820 Series of Step-Down ISRs
Using Margin Up/ Margin Down
The Margin Up (pin 4) and Margin Down (pin 3) control
inputs allow the output voltage to be easily adjusted by
approximately ±5% of the the set-point voltage. These
control inputs provide a convenient method for applying
a momentary adjustment to test a load circuit’s supply
voltage margins. To activate, simply connect the appro-
priate 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 application.
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 3-1 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 3-2.
Refer to Figure 3-1 for the placement of the required
resistor. Use the resistor R1 to adjust up, and the resistor
(R2) to 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 3-1.
Adjust Down: Add a resistor (R2), between Vo Adjust (pin 1)
and Sense(+) (pin 18). See Figure 3-1.
Figure 3-1; 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 3-1for 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 3-1
Ro = The resistance constant in Table 3-1
Table 3-1
ISR OUTPUT VOLTAGE ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt. No.
PT5827
PT5821
PT5822
PT5823
PT5824
PT5825
PT5826
Vo (nom)
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
Va (min)
4.0V
2.6V
2.0V
1.52V
1.31V
1.1V
0.94V
Va (max)
5.5V
3.63V
2.8V
2.1V
1.82V
1.52V
1.32V
Vr
1.27V
0.8V
Ro (k
)
10.0
10.2
10.7
10.2
9.76
10.0
10.2
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 (+).
PT5820
9–13
1
18
14–17
8
C
OUT
330F
(Optional)
+
GND
V
OUT
Sense (+) [Note 3]
Sense (–)
(R
2)
Adj Down
V
O Adj
GND
Sense(+)
Sense(–)
V
OUT
R
1
Adjust Up
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