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| 型号： | PT5827A |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 16 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA18 |
| 封装： | HORIZONTAL MOUNT PACKAGE-18 |
| 文件页数： | 9/12页 |
| 文件大小： | 207K |
| 代理商： | PT5827A |
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
Using the Inhibit Control of the PT5820 Series
of Step-Down Regulators
For applications requiring output voltage On/Off control,
the PT5820 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
11–13). When a low-level ground signal is applied to
pin 2, the regulator output is turned off.
Figure 2-1 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 required to control
this input 1. The voltage thresholds are given in Table 2-1.
Table 2-1; 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 15V (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. The output
voltage decays to zero as the load impedance discharges
the output capacitors.
3. During the period ‘td’ in Figure 2-2 the module will
assert a low impedance to ground. This will discharge any
residual voltage across the output capacitors, and will
crowbar any voltage supplied from external sources.
Figure 2-1
Turn-On Time:
In the circuit of Figure 2-1, 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 period, td (approx. 10-15msec) 3,
followed by a period in which the output voltage rises
to its full regulation voltage. The module produces a
regulated output voltage within 20msec. Figure 2-2
shows the typical rise in both the output voltage and
input current for a PT5821 (3.3V), 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
12VDC input voltage, and 10-A load.
Figure 2-2
Vo (2V/Div)
Iin (2A/Div)
Q1 Vds (10V/Div)
HORIZ SCALE: 5ms/Div
td
PT5820 Series
PT5820
V
IN
9–13
4
118
14–17
5, 6, 7
8
2
C
IN
560F
+
C
OUT
330F
+
1 =Inhibit
GND
V
OUT
3
Output Sense (+)
Output Sense (–)
Q
1
BSS138
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