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參數(shù)資料
| 型號： | PT6922A |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, SMA23 |
| 封裝： | SIP-23 |
| 文件頁數(shù)： | 3/5頁 |
| 文件大?。?/td> | 202K |
| 代理商： | PT6922A |
For assistance or to order, call (800) 531-5782
3
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
Applicatio n
Note s
PT6920 Series
Adjusting the Output Voltage of the PT6920 Dual
Output Voltage ISR
Both output voltages from the Power Trends PT6920 series
ISRs can be independantly adjusted higher or lower than their
factory trimmed pre-set voltage. In each case only a single
external resistor is required to adjust either V1 (the voltage at
V1out, or V2 (the voltage at V2out). Table 1 gives the permis-
sible adjustment range for both V1 and V2 for each model in the
series as Va(min) and Va(max). Note: V2 must always be lower
than V1.
V1 Adjust Up:
To increase the output, add a resistor R4 be-
tween pin 16 (V1 Adjust) and pins 7-11 (GND).
V1 Adjust Down:
Add a resistor (R3), between pin 16
(V1 Adjust) and pin 1 (V1 Remote Sense).
V2 Adjust Up:
Add a resistor R2 between pin 23 (V2 Adjust)
and pins 7-11 (GND).
V2 Adjust Down:
Add a resistor (R1) between pin 23 (V2 Adjust)
and pin 22 (V2 Remote Sense).
Refer to Figure 1 and Table 2 for both the placement and value
of the required resistor.
Notes:
1. The voltage at V1out and V2out may be adjusted
independantly.
2. V2 must always be at least 0.2V lower than V1.
3. If V1 is increased above 3.3V, the minimum input voltage to
the ISR must also be increased. The minimum required
input voltage must be (V1 + 1.2)V or 4.5V, whichever is
greater. Do not exceed 6.0V
4. Use only a single 1% resistor in either the (R3) or R4 loca-
Table 1
PT6920 ADJUSTMENT RANGE AND FORMULA PARAMETERS
Output Bus
V1 out
V2 out
Series Pt #
PT6921/22
PT6921
PT6922
Adj. Resistor
(R3)/R4
(R1)/R2
Vo(nom)
3.3V
2.5V
1.5
Va(min)
2.3V
1.8V
1.2
Va(max)
4.2V
3.0V
3.0
Ro (k
)
12.1
10.0
9.76
Rs (k
)
12.1
11.5
6.49
Figure 1
C1
330
F
+
C2
330
F
+
C3
100
F
+
R4
(R3)
(R1)
R2
L
O
A
D
L
O
A
D
Adj Down
Adjust Up
Vin
COM
V2
out
V1
out
PT6920
18 - 21
23
7 - 11
4,5,6
Vin
V2
out
GND
Vo
2(adj)
V
1(sns)
1
16
Vo
1(adj)
12 - 15
V1
out
V
2(sns)
22
STBY
3
Adjust V1
out
Adjust V2
out
tion to adjust V1, and in the (R1) or R2 location to adjust V2.
Place the resistor as close to the ISR as possible.
5. Never connect capacitors to either the V1 Adjust or
V2 Adjust pins. Any capacitance added to these control pins
will affect the stability of the respective regulated output.
6. To comply with the ISRs power dissipation limits, changes
made to either output voltage (V1 or V2) may affect the
maximum current available from both outputs. For more
information, consult the related applications note, “Deter-
mining the Maximum Output Current for the PT6920
Series Dual Output ISR.”
The adjust up and adjust down resistor values can also be calcu-
lated using the following formulae. Be sure to select the correct
formula parameter from Table 1 for the output and model being
adjusted.
(R1)/(R3)
=
Ro (Va – 1)
– Rs
k
Vo – Va
R2/R4
=
Ro
– Rs
k
Va – Vo
Where:
Vo = Original output voltage, (V1 or V2)
Va = Adjusted output voltage
Ro = The resistance value from Table 1
Rs = The series resistance from Table 1
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