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参数资料
| 型号： | PT6523E |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 8 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA14 |
| 封装： | SMD-14 |
| 文件页数： | 8/12页 |
| 文件大小： | 225K |
| 代理商： | PT6523E |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT6520 Series
Adjusting the Output Voltage of the PT6520
Series of Integrated Switching Regulators
The output voltage of the PT6520 series of integrated
switching regulators (ISRs) may be adjusted higher or
lower than the factory trimmed pre-set voltage with the
addition of a single external resistor. 1 Table 1 gives the
allowable adjustment range for each model in the series as
Va (min) and Va (max).
Adjust Up:
An increase in the output voltage is obtained
by adding a resistor R2, between pin 14 (Vo adjust) and
pins 7-10 (GND).
Adjust Down:
Add a resistor (R1), between pin 14 (Vo ad-
just) and pin 1 Vo(sense) 3.
Refer to Figure 1 and Table 2 for both the placement and value
of the required resistor, either (R1) or R2 as appropriate.
The values of (R1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulas.
Ro ( Va –Vr )
(R1)
=
Vo – Va
– Rs
k
Ro Vr
– Rs
k
R2
=
Va – Vo
Where: Vo = Original output voltage
Va = Adjusted output voltage
Vr = The reference voltage (Table 1)
Ro = The multiplier resistance (Table 1)
Rs = The internal series resistance (Table 1)
Figure 1
C
in
+
C
out
+
(R1)
Adj Down
R2
Adj
Up
Vo
COM
Vin
COM
PT6520
11,12,13
14
7,8,9,10
4,5,6
Vin
Vout
GND
Vo(adj)
STBY
3
Vo(sense)
1
L
O
A
D
Table 1
ADJUSTMENT AND FORMULA PARAMETERS
Series Pt #
PT6527
PT6522
PT6526
PT6525
PT6523
PT6521
Vo (nom)
1.2
1.5
1.8
2.1
2.5
3.3
Va (min)
1.09
1.47
1.75
1.95
2.25
2.75
Va (max)
1.52
1.73
2.05
2.45
2.85
3.75
Vr (V)
0.8
1.27
Ro (k
)
10.0
10.2
10.0
Rs (k
)
24.9
49.9
33.2
24.9
Notes:
1. Use only a single 1% 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, Vout, or the Remote Sense pin. 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
resistor (R1) may be connected between pin 14 (Vo
adjust) and pins 11–13 (Vout).
4. Adjusting the output voltage of the PT6523 (2.5V
model) higher than the factory pre-trimmed output
voltage may increase the minimum input voltage
specified for the part. This model must comply with
the following requirements.
PT6523:
Vin(min) = (Va + 0.5)V or 3.1V, whichever is greater.
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