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參數(shù)資料
| 型號： | PT4529 |
| 英文描述： | 100V Single N-Channel HEXFET Power MOSFET in a TO-220AB package; A IRFB4610 with Standard Packaging |
| 中文描述： | 1.2V的5A條。 48 - V輸入隔離DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大小： | 192K |
| 代理商： | PT4529 |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Using the Remote On/Off Function on the PT4500/
PT4520 Series of Isolated DC/DC Converters
For applications requiring output voltage on/off control,
the PT4500/4520 series of DC/DC converters incorporate
a remote on/off function. This function may be used in
applications that require battery conservation, power-up/
shutdown sequencing, and/or to coordinate the power-up
of the regulator for active in-rush current control. (See
the related application note, SLTA021).
This function is provided by the
Remote On/Off
control,
pin1. If pin 1 is left open-circuit, the converter provides
a regulated output whenever a valid source voltage
3
is
applied between +V
in
(pin 4, 5), and –V
in
(pin 2, 3).
Connecting pin 1 to pin 2, or applying a low-level signal
to pin 1 (with respect to –V
in
),
1
will disable the regulator
output
5
.
Table 3-1 provides details of the interface requirements
for the
Remote On/Off
pin. Figure 3-1 shows how a discrete
MOSFET (Q
1
), may be referenced to the negative input
voltage rail and used with this control input.
Table 3-1 Inhibit Control Requirements
1
Parameter
Enable (V
IH
)
Disable (V
IL
)
Min
2.5V
–0.3V
Max
(Open Circuit)
4
0.8V
Notes:
1.
The on/off control uses -V
in
(pin 1), on the primary
side of the converter, as its ground reference. All
voltages specified are with respect to -V
in
.
2. The on/off control internal circuitry is a high
impedance 10μA current source. The open-circuit
voltage may be as high as 8.3Vdc.
3. The PT4500/20 series incorporates an “Under-Voltage
Lockout” (UVLO) function. The UVLO prevents
operation of the converter when there is sufficient input
voltage to support a regulated output. Below the UVLO
threshold voltage, there is no output from the module
and the Remote On/Off control is inoperative.
4.
The
Remote On/Off
input of the PT4500/20 series
must be controlled with a low-leakage (<100nA) open-
drain MOSFET.
Do not
use a pull-up resistor.
5. When the converter output is disabled, the current
drawn from the input supply is typically reduced to
8mA (16mA maximum).
6. Keep the on/off transition to less than 1ms. This
prevents erratic operation of the ISR, whereby the
output voltage may drift un-regulated between 0V
and the rated output during power-up.
Figure 3-1
Turn-On Time:
The converter typically produces a fully
regulated output voltage within 35ms after the removal
of the low voltage signal from the
Remote On/Off
pin.
Using the circuit of Figure 3-1, Figure 3-2 shows the
output voltage and input current waveforms of a PT4521
after Q
1
is turned off. The turn off of Q
1
corresponds to
the drop in Q
1
Vgs voltage. The waveforms were mea-
sured with a 48Vdc input voltage, and 2.75-A resistive
load.
Figure 3-2
+V
in
–
V
in
+V
o
–
V
o
Q1
BSS138
Note 4
V
GS
PT4500/4520
+Vout
–
Vout
+Vin
–
Vin
Remote
On/Off
V
o
(adj)
1
2, 3
4, 5
9,10
7, 8
6
PT4500/4520 Series
Vout (2V/Div)
Iin (0.2A/Div)
Q1 Vgs (10V/Div)
HORIZ. SCALE: 5ms/Div
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