Datasheet
Table Of Contents
- FEATURES
- APPLICATIONS
- DESCRIPTION
- ABSOLUTE MAXIMUM RATINGS
- ELECTRICAL CHARACTERISTICS
- ELECTRICAL CHARACTERISTICS
- DEVICE INFORMATION
- PTH12030W TYPICAL CHARACTERISTICS (VI = 12 V)Characteristic data has been developed from actual products tested at 25C. This data is considered typical data for the converter. Applies to , , and .SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures. Derating limits apply to modules soldered directly to a 4 in. 4 in. double-sided PCB with 1 oz. copper. For surface mount products (AS and AZ suffix), multiple vias (plated through holes) are required to add thermal paths around the power pins. Please refer to the mechanical specification for more information. Applies to .
- PTH12030L TYPICAL CHARACTERISTICS (VI = 12 V)Characteristic data has been developed from actual products tested at 25C. This data is considered typical data for the converter. Applies to , , and .SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures. Derating limits apply to modules soldered directly to a 4 in. 4 in. double-sided PCB with 1 oz. copper. For surface mount products (AS and AZ suffix), multiple vias (plated through holes) are required to add thermal paths around the power pins. Please refer to the mechanical specification for more information. Applies to .
- APPLICATION INFORMATION
- TAPE AND REEL SPECIFICATIONS
- TRAY SPECIFICATIONS
APPLICATION INFORMATION
ADJUSTING THE OUTPUT VOLTAGE
NOTES
Equation 1. Output Voltage Adjust
R =10k x
SET
W
0.8V
-R k
S
W
V -V
O min
(1)
PTH12030W/L
SLTS211H – MAY 2003 – REVISED DECEMBER 2008 ....................................................................................................................................................
www.ti.com
The V
O
Adjust control (pin 5) sets the output voltage of the PTH12030W/L. The adjustment range is 1.2V to 5.5V
for the W-suffix modules, and 0.8V to 1.8V for L-suffix modules. The adjustment method requires the addition of
a single external resistor, R
SET
, that must be connected directly between the V
O
Adjust and GND pins
(1)
. Table 1
gives the standard value of the external resistor for a number of standard voltages, along with the actual output
voltage that this resistance value provides. For other output voltages the required resistor can either be
calculated using Equation 1 , or simply selected from the range of values given in Table 3 . Figure 10 shows the
placement of the required resistor.
Table 1. Standard Values of R
SET
for Standard Output Voltages
PTH12030W PTH12030L
V
O
(Required) (V) R
SET
(k Ω ) V
O
(Actual) (V) R
SET
(k Ω ) V
O
(Actual) (V)
5 0.280 5.009 N/A N/A
3.3 2 3.294 N/A N/A
2.5 4.32 2.503 N/A N/A
2 8.06 2.01 N/A N/A
1.8 11.5 1.801 0.130 1.8
1.5 24.3 1.506 3.57 1.499
1.2 Open 1.2 12.1 1.201
1.1 N/A N/A 18.7 1.101
1 N/A N/A 32.4 0.999
0.9 N/A N/A 71.5 0.901
0.8 N/A N/A Open 0.8
Figure 10. V
o
Adjust Resistor Placement
1. R
SET
: Use a 0.05 W resistor with a tolerance of 1% and temperature stability of 100 ppm/C (or better).
Connect the resistor directly between pins 5 and 7, as close to the regulator as possible, using dedicated
PCB traces.
2. Never connect capacitors from V
O
Adjust to either GND or V
O
. Any capacitance added to the V
O
Adjust pin
affects the stability of the regulator.
Use Equation 1 to calculate the adjust resistor value. See Table 2 for parameters, R
S
and V
min
.
Table 2. Adjust Equation Parameters
PARAMETERS PTH12030W PTH12030L
V
(MIN)
1.2 V 0.8 V
V
(MAX)
5.5 V 1.8 V
R
S
1.82 k Ω 7.87 k Ω
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