PT6360 Datasheet, PDF (7/14 Pages) Texas Instruments – 11 A 12-V Input Adjustable Integrated Switching Regulator

Application Notes
PT6360 Series
Adjusting the Output Voltage of the PT6360 Series
of Integrated Switching Regulators
The output voltage of the PT6360 series of power modules
may be adjusted higher or lower than the pre-set voltage
with the addition of a single external resistor. Table 3-1
gives the allowable adjustment range for each model of the
series as V_a (min) and V_a (max). The value of the external
resistor can either be calculated using the formulas given
below, or simply selected from the range of values given
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 R₂, between V_o adjust (pin 12) and
GND (pins 5-8).
Adjust Down: Add a resistor (R₁), between V_o adjust (pin 12)
and (+)Sense (pin 11).
Figure 3-1
+V_IN
2–4 _Vin
11
(+)Sense
PT6360 _Vo 9–10
C_IN
+
560 µF
(Req'd)
Inh
GND Vo(adj)
1
5–8
12
(R₁)
Adj Down
R₂
Adjust Up
COM
+V_O
C_OUT
330 µF
(Optional)
COM
The values of (R₁) [adjust down], and R₂ [adjust up],
can be calculated using the following formulas. Refer to
Figure 3-1 for the placement of the required resistor;
either (R₁) or R₂ as appropriate.
(R₁)
=
R_o (V_a – 0.8)
V_o – V_a
– R_s kΩ
R₂
=
0.8 R_o
V_a – V_o
– R_s kΩ
Where:
V_o = Original output voltage
V_a = Adjusted output voltage
R_o = The resistance value from Table 3-1
R_s = The series resistance from Table 3-1
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 V_o Adjust to either GND or
V_out. Any capacitance added to the V_o Adjust pin will affect
the stability of the ISR.
3. If the remote sense feature is not being used, the adjust
resistor (R₁) can also be connected to V_out, (pins 9–10)
instead of (+)Sense.
Table 3-1
ISR OUTPUT VOLTAGE ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt. No. PT6361
PT6362
PT6363
PT6364
Vo (nom)
Va (min)
Va (max)
Ro (kΩ)
Rs (kΩ)
5.0 V
3.35 V
5.5 V
10.0
15.0
3.3 V
2.6 V
3.63 V
10.2
24.9
2.5 V
2.0 V
2.8 V
10.7
24.9
1.8 V
1.52 V
2.1 V
10.2
24.9
PT6365
1.5 V
1.31 V
1.82 V
9.76
24.9
PT6366
1.2 V
1.1 V
1.52 V
10.0
24.9
PT6367
1.0 V
0.95 V
1.32 V
10.2
24.9
For technical support and more information, see inside back cover or visit www.ti.com