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| 型号： | PT5801A |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 18 A SWITCHING REGULATOR, 350 kHz SWITCHING FREQ-MAX, SMA18 |
| 封装： | ROHS COMPLIANT, SIP-18 |
| 文件页数： | 11/13页 |
| 文件大小： | 228K |
| 代理商： | PT5801A |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
Using the Inhibit Control of the PT5800 & PT5810
Series of Step-Down ISRs
For applications requiring output voltage On/Off control,
the PT5800 & PT5810 series of ISRs incorporate an
inhibit function. This function can be used wherever there
is a requirement for the output voltage from the ISR to be
turned off. The On/Off function is provided by the Inhibit*
control (pin 2).
The ISR functions normally with pin 2 open-circuit,
providing a regulated output whenever a valid source
voltage is applied between Vin (pins 5–7) and GND (pins
9–13). When a low-level ground signal is applied to
pin 2, the regulator output is turned off 2.
Figure 4-1 shows the typical application of the Inhibit*
function. Note the discrete transistor (Q1). The Inhibit*
control has its own internal pull-up to +Vin potential. An
open-collector or open-drain device is recommended to
control this input 1. The voltage thresholds are given in
Table 4-1.
Table 4-1; Inhibit Control Requirements
Parameter
Min
Typ
Max
Enable (VIH)Vin – 0.5V
—
Open
Disable (VIL)
–0.2V
—
+0.8V
I IL
—
–0.5 mA
—
Notes:
1. Use an open-collector device with a breakdown voltage
of at least 10V (preferably a discrete transistor) for the
Inhibit* input. A pull-up resistor is not necessary. To
disable the output voltage the control pin should be
pulled low to less than +0.8VDC.
2. When a ground signal is applied to the Inhibit* control
(pin 2) the module output is turned off (tri-state). The
output voltage decays to zero as the load impedance
discharges the output capacitors.
Figure 4-1
Turn-On Time:
In the circuit of Figure 4-1, turning Q1 on
applies a low-voltage to the Inhibit* control (pin 2) and
disables the output of the regulator 2. If Q1 is then turned
off, the ISR executes a soft-start power up. Power up
consists of a short delay (approx. 2msec), followed by a
period in which the output voltage rises to its full regu-
lation voltage. The module produces a regulated output
voltage within 10msec. Figure 4-2 shows the typical rise
in both the output voltage and input current for a PT5812
(2.5V), following the turn-off of Q1. The turn off of Q1
corresponds to the rise in the waveform, Q1 Vds. The
waveforms were measured with a 3.3VDC input voltage,
and 10-A load.
Figure 4-2
Vo (1V/Div)
Iin (5A/Div)
Q1 Vds (2V/Div)
HORIZ SCALE: 2ms/Div
PT5800 & PT5810 Series
PT5812
V
IN
9–13
4
118
14–17
5, 6, 7
8
2
C
IN
1,000F
+
C
OUT
330F
+
1 =Inhibit
GND
V
OUT
3
Output Sense (+)
Output Sense (–)
Q
1
BSS138
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