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參數(shù)資料
| 型號(hào)： | PT6937A |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 10 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA23 |
| 封裝： | HORIZONTAL MOUNT PACKAGE-23 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 267K |
| 代理商： | PT6937A |
For technical support and more information, see inside back cover or visit www.ti.com
PT6935 Series
11-A 5V/3.3V-Input Dual Output
Integrated Switching Regulator
Power-up Sequencing and Vo1/Vo2 Loading
Power-up Sequencing
The PT6935 series of regulators provide two output voltages,
Vo1 and Vo2. Each of the output voltage combinations
offered by the PT6935 series provides power for both a low-
voltage processor core, and the associated digital support
circuitry. In addition, each output is internally sequenced
during power-up and power-down to comply with the
requirements of most DSP and P IC’s, and their accompa-
nying chipsets. Figure 1 shows the typical waveforms of the
output voltages, Vo1 and Vo2, from the instance that either
input power is applied or the module is enabled via the
Standby pin. Following a delay of about 10 to 15 milli-secs,
the voltages at Vo1 and Vo2 rise together until Vo2 reaches
its set-point. Then Vo1 continues to rise until both output
voltages have reached full voltage.
Vo1/Vo2 Loading
The output voltages from the PT6935 series regulators are
independently regulated. The voltage at Vo1 is produced
by a highly efficient switching regulator. The lower output
voltage, Vo2, is derived from Vo1. The regulation method
used for Vo2 also provides control of this output voltage
during power-down. Vo2 will sink current if the voltage at
Vo1 attempts to fall below it.
The load specifications for each model of the PT6935
series gives both a ‘Typical’ (Typ) and ‘Maximum’ (Max)
load current for each output. For operation within the
product’s rating, the load currents at Vo1 and Vo2 must
comply with the following limits:-
Io2 must be less than Io2(max).
The sum-total current from both outputs (Io1 + Io2)
must not exceed Io1(max).
In the case that either Vo1 or Vo2 are adjusted to some
other value than the default output voltage, the absolute
maximum load current for Io2 must be revised to comply
with the following equation.
Io2 (max)
=
2.5
Adc
Vo1 – Vo2
Consult the specification table for each model of the series
for the actual numeric values.
Figure 1; PT6935 Series Power-up
V1 (1V/Div)
V2 (1V/Div)
Vstby
(10V/Div)
HORIZ SCALE: 5ms/Div
General Specifications (Unless otherwise stated, Ta =25°C, Vin =5V)
PT6935 Series
Characteristic
Symbol
Conditions
Min
Typ
Max
Units
Short Circuit Current
Isc
Io1 + Io2 combined
—
17
—
A
Switching Frequency
o
Over Vin range
300
350
400
kHz
Standby (Pin 3)
Referenced to GND (pin 7)
Input High Voltage
VIH
—
Open (1)
V
Input Low Voltage
VIL
–0.1
—
+0.4
Input Low Current
IIL
—
-0.5
–
mA
Standby Input Current
Iin standby
pin 3 to GND
—
7
25
mA
External Output Capacitance
C2
330 (2)
—
3,300 (2)
F
C3
0
—
330
MaximumOperating
Ta
Over Vin Range
–40 (3)
—
+85 (4)
°C
TemperatureRange
Storage Temperature
Ts
—
–40
—
+125
°C
Mechanical Shock
Per Mil-STD-883D, Method 2002.3
1msec,Sine,mounted
—
500
—
G’s
Mechanical Vibration
Per Mil-STD-883D, Method 2007.2
—
15 (5)
—G’s
20-2000 Hz, Soldered in a PC board
Weight
—
Vertical/Horizontal
—
26
—
grams
Flammability
—
MeetsUL94V-O
Notes:
(1) The Standby (pin 3) has an internal pull-up, and if it is left open circuit the module will operate when input power is applied. The open-circuit voltage is less
than 15V. Refer to the application notes for interface considerations.
(2) A value of 300F is sufficient if Oscon or low ESR tantalum type capacitors are used. The total combined ESR of all output capacitance at 100kHz must
be (greater than) >12 m
, and (less or equal to) ≤150m.
(3) For operating temperatures below 0°C, Cin and Cout must have stable characteristics. Use either tantalum or Oscon capacitors.
(4) See Safe Operating Area curves for the specific output voltage combination, or contact the factory for the appropriate derating.
(5) Only the case pins on through-hole pin configurations (N & A) must be soldered. For more information see the applicable package outline drawing.
Input/Output Capacitors: The PT6935 series requires a 330F electrolytic capacitor at both the input and output for proper operation (300F for Oscon or low ESR
tantalum). In addition, the input capacitance must be rated for a minimum of 1.0Arms ripple current. For transient or dynamic load applications, additional capacitance
may be required. Refer to the application notes for more information.
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