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参数资料
| 型号： | PT3407N |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 16 W DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 15/15页 |
| 文件大小： | 332K |
| 代理商： | PT3407N |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT3400 Series
On/Off Enable Turn-On Time
The total turn-on time of the module is the combination
of a short delay period, followed by the time it takes the
output voltage to rise to full regulation. When the con-
verter is enabled from the EN1 or EN2 control inputs, the
turn-on delay time (measured from the transition of the
enable signal to the instance the outputs begin to rise)
is typically 50 milliseconds. By comparison, the rise time
of the output voltage is relatively short, and is between 1
and 2 milliseconds. The rise time varies with input voltage,
output load current, output capacitance, and the SEQ pin
function. Figure 2-3 shows the power-up response of a
PT3401 (3.3V), following the removal of the ground
signal at EN1 in Figure 2-1.
Using the On/Off Enable Controls on the
PT3400 Series of DC/DC Converters
The PT3400 series of DC/DC converters incorporate
two output enable controls. EN1 (pin 1) is the ‘positive
enable’ input, and EN2 (pin 2) is the ‘negative enable’
input. Both inputs are electrically referenced to -Vin
(pin 3), at the input or primary side of the converter.
The enable pins are ideally controlled with an open-
collector (or open-drain) discrete transistor. A pull-up
resistor is not required. If a pull-up resistor is added, the
pull-up voltage must be limited to 15V. The logic truth
table for EN1 and EN2 is given in Table 2-1, below.
Table 2-1; On/Off Enable Logic
EN1 (pin 1)
EN2 (pin 2)
Output Status
0×
Off
10
On
×
1
Off
Logic ‘0’
= –Vin (pin 3) potential
Logic ‘1’
= Open Circuit
Automatic (UVLO) Power-Up
Connecting EN2 to -Vin and leaving EN1 open-circuit
configures the converter for automatic power up (see data
sheet ‘Standard Application’). The converter control
circuitry incorporates an ‘under-voltage lockout’ (UVLO),
which disables the converter until a minimum input
voltage is present at ±Vin (see data sheet specifications).
The UVLO ensures a clean transition during power up
and power down, allowing the converter to tolerate a
slowly rising input voltage. For most applications EN1
and EN2, can be configured for automatic power-up.
Positive Output Enable (Negative Inhibit)
To configure the converter for a positive enable function,
connect EN2 to -Vin, and apply the system On/Off control
signal to EN1. In this configuration, applying less than
0.8V (with respect to -Vin) to EN1 disables the converter
outputs. Figure 2-1 is an example of this implemention.
DC/DC
Module
EN 1
EN 2
–Vin
–V
IN
1 =Outputs Off
1
2
3
BSS138
DC/DC
Module
EN 1
EN 2
–Vin
–V
IN
1 =Outputs On
1
2
3
BSS138
Figure 2-2; Negative Enable Configuration
Figure 2-1; Positive Enable Configuration
Negative Output Enable (Positive Inhibit)
To configure the converter for a negative enable function,
EN1 is left open circuit, and the system On/Off control
signal is applied to EN2. Applying less than 0.8V (with
respect to -Vin ) to EN2, enables the converter outputs. An
example of this configuration is provided in Figure 2-2.
Note: The converter will only produce an output voltage if a
valid input voltage is applied to ±Vin.
Vo (2V/Div)
VEN1(5V/Div)
HORIZ SCALE: 5ms/DIV
Delay Time
Figure 2-3; PT3401 Enable Turn-On
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