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参数资料
| 型号： | PT6721C |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 14 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA23 |
| 封装： | SURFACE MOUNT PACKAGE-23 |
| 文件页数： | 3/7页 |
| 文件大小： | 194K |
| 代理商： | PT6721C |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Operating Features of the Programmable
PT6700 “Excalibur” Series ISRs
Power Good
Programmable versions of the PT6700 Series regulators
incorporate a PWR Good output (pin 2). This output is
open-drain and generates an acitve-high signal when the
sensed output from the ISR is within a nominal ±10%
of the programmed set point. When the regulated output is
outside this range, pin 2 asserts a logic low (typically <0.1V).
A 10k
pull-up resistor to a valid bus voltage is required. If
the power good feature is not used, the pull-up resistor
can be omitted. The maximum voltage that may be applied
to the pull-up resistor is 15V.
Over-Voltage Protection (OVP)
The PT6700 programmable regulators also incorporate
an OVP function. The OVP DRV (pin 1) normally has
a logic low output (typically <0.1V). When the ISR’s sensed
output exceeds the programmed output setting by 15%,
pin 1 produces a 60mA, +12V drive signal. This drive
signal can trigger an SCR, which can be used to disable
the input voltage, or alternatively interface to another
external monitoring device. When the ISR output voltage
returns to within 15% of its programmed setting, pin 1
reverts back to its low state. If the OVP function is not
used, pin 1 may be left open circuit.
Stand-By Function
The PT6700 series ISRs incorporate a standby function.
This feature may be used for power-up sequencing, or
wherever there is a requirement for the output voltage to
be controlled by external circuitry.
If the STBY* input (pin 8) is left open-circuit the regulator
operates normally, providing a regulated output when a
valid supply voltage is applied to Vin (pins 10-12) with
respect to GND (pins 14-18). Connecting pin 8 to ground 1
places the regulator in standby mode, and reduces the
input current to typically 20mA (30mA max). Applying a
ground signal to pin 8 prior to power-up, will disable
the output during the period that input power is applied.
To ensure that the regulator output is fully enabled, pin 8 must
be allowed to rise to a minimum of 3.0V.
Notes:
1. The standby on the PT6700 series is ideally controlled
with an open-collector (or open-drain) discrete transistor
(See fig. 1). Table 1 gives the threshold requirements. Do
Not use a pull-up resistor. The control input has an open-
circuit voltage of about 4.0Vdc. To set the regulator
output to zero, the control pin must be “pulled” to less
than 1.0Vdc with a sink to ground.
Figure 1
Figure 2
C
out
+
C
in
+
5V
COM
Inhibit
L
O
A
D
V
o =2.5V
COM
Q1
BSS138
PT6700
76
54
3
2 3
19-22
13
8
14-18
2
10-12
Vo
Vin
GND
SNS ( + )
SNS ( - )
Pwr
Good
STBY
VID4 - VID0
1
OVP
R1
10k
5V
D1
BAT54 *
OVP DRV
Pwr
Good
* or equiv. Schottky diode
PT6701/PT6702/PT6721
0
5
10
15
20
25
30
35
40
t (milli - secs)
Iin (5A/Div)
Vout (2V/Div)
VPWGD (10V/Div)
2. The Standby input can also be interfaced to TTL or other
bi-directional output device using a schottky diode. See
Figure 1.
3. When placed in the standby mode, the regulator output
may assert a low impedance to ground. If an external
voltage is applied to the output, it will sink current and
possibly over-stress the part.
Table 1 Inhibit Control Threshold 2,3
Parameter
Min
Typ
Max
Enable (VIH)
3.0V
Disable (VIL)
-0.1V
0.4V
1..0V
Istby
0.01mA
Turn-On Time
Turning Q1 in Figure 1 off, removes the low-voltage signal
at pin 8 and enables the output. Following a brief delay
of 10-15ms, the output voltage of the PT6700 regulator
rises to full regulation within 30ms. Figure 2 shows the
typical output voltage waveform of a PT6701 following the
prompt turn-off of Q1 at time t =0 secs. The output
voltage was set to 2.5V. The waveforms were measured
with a 5V input source voltage, and 10A resistive load.
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