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參數(shù)資料
| 型號(hào)： | PTB78520WAD |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT PACKAGE-10 |
| 文件頁(yè)數(shù)： | 14/15頁(yè) |
| 文件大小： | 443K |
| 代理商： | PTB78520WAD |
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Application Notes
For technical support and further information visit http://power.ti.com
PTB78520W
Using the Output Enable Control on the PTB78520
Auto-Track Compatible DC/DC Converter
The ‘VO Enable’ (pin 2) control is an active low input that
allows the output voltage from the converter to be turned
on and off while it is connected to the input source. The
‘VO Enable’ input is referenced to the –VIN (pin 3) 1, on
the primary side of the converter’s isolation, and has its
own internal pull up. The open-circuit voltage is approxi-
mately 20% of the applied input source voltage.
For the converter to function normally pin 2 must be
pulled low to –VIN potential 2. The converter output will
then produce a regulated voltage whenever a valid source
voltage is applied between +VIN (pin 1) and –VIN (pin 3) 3.
If the voltage at pin 2 is allowed to rise above VIH(min),
(see specification table), the output from the converter
will be turned off.
Figure 1-1 is an application schematic that shows the
typical use of the Output Enable function. Note the discrete
transistor (Q1). Either a discrete MOSFET or bipolar
transistor is recommended to control this input. Table 1-1
gives the threshold requirements.
When placed in the “Off” state the output will neither
source or sink output current. The load voltage will then
decay as the output capacitance is discharged by the load
circuit. With the output turned off, the current drawn
from the input source is typically reduced to 2 mA.
Table 1-1; Output Enable Control Requirements 1
Parameter
Min
Typ
Max
Enable (VIH)2 V
—
Disable (VIL)
—
0.8 V
VO/C [Open-Circuit]
—
13.5 V
IIN [pin 1 at –VIN]
—
–0.6 mA
Notes:
1. The Output Enable control uses –VIN (pin 3) as its ground
reference. All voltages are with respect to –VIN.
2. Use an open-collector (or open-drain) discrete transistor
to control the Output Enable input. A pull-up resistor is
not necessary. To disable the converter the control pin
should be pulled low to less than +0.8 V. If the Output
Enable feature is not used, pin 2 should be permanently
connected to –VIN (pin 3).
3. The converter incorporates an “Under-Voltage Lockout”
(UVLO). The UVLO does not allow the converter to
power up until the input voltage is close to its minimum
specified operating voltage. This is regardless of the state
of the Output Enable control. Consult the specifications
for the UVLO thresholds.
Turn-On Time: In the circuit of Figure 1-1, turning Q1
off allows the voltage at pin 2 to rise to its internal pull-
up voltage. This disables the converter output. When Q1
is then turned on, it applies a low-level voltage to pin 2,
and enables the output of the converter. The converter
produces a regulated output voltage within 50 ms. Fig-
ure 1-2 shows the output response of a PTB78520W
after Q1 is turned on. The turn on of Q1 corresponds to
the drop in the Q1 Vds waveform. Although the output
voltage rise-time is short (<10 ms), the indicated delay
time (td) will vary depending upon the input voltage and
the module’s internal timing. The output voltage of
the PTB78520W was set to 3.3 V. The waveforms were
measured with 24-Vdc input voltage, and a 10 A resistive
load.
Figure 1-2; Output Enable Power-Up Characteristic
+VIN
–VIN
L
O
A
D
R1
10 k
1 = Enable
R2
887
Q1
BSS138
PTB78520W
VO Bus
VO Seq
+VIN
–VIN
+Sense
VO Adjust
–Sense
VO COM
VO Enable
Track
1
2
3
4
8
10
9
7
6
5
t d
V Bus (1 V/Div)
Iin (1 A/Div)
Q Vds (5 V/Div)
1
o
HORIZ SCALE: 5 ms/Div
Figure 1-1; Output Enable Operation
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