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参数资料
| 型号： | PTH05060WAST |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 36 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | PLASTIC PACKAGE-10 |
| 文件页数： | 5/19页 |
| 文件大小： | 593K |
| 代理商： | PTH05060WAST |
Application Notes
For technical support and further information visit http://power.ti.com
PTH Series of Wide-Output Adjust
Power Modules (3.3/5-V Input)
Pre-Bias Startup Capability
Only selected products in the PTH family incorporate this
capability. Consult Table 3-1 to identify which products
are compliant.
A pre-bias startup condition occurs as a result of an external
voltage being present at the output of a power module prior
to its output becoming active. This often occurs in com-
plex digital systems when current from another power
source is backfed through a dual-supply logic component,
such as an FPGA or ASIC. Another path might be via
clamp diodes as part of a dual-supply power-up sequencing
arrangement. A prebias can cause problems with power
modules that incorporate synchronous rectifiers. This is
because under most operating conditions, these types of
modules can sink as well as source output current.
The PTH family of power modules incorporate synchro-
nous rectifiers, but will not sink current during startup 1,
or whenever the Inhibit pin is held low. However, to ensure
satisfactory operation of this function, certain conditions
must be maintained. 2 Figure 3-9 shows an application
demonstrating the pre-bias startup capability. The start-
up waveforms are shown in Figure 3-10. Note that the
output current from the PTH03010W (Io) shows negli-
gible current until its output voltage rises above that
backfed through diodes D1 and D2.
Note: The pre-bias start-up feature is not compatible with
Auto-Track. When the module is under Auto-Track control,
it will sink current if the output voltage is below that of a
back-feeding source. To ensure a pre-bias hold-off one of two
approaches must be followed when input power is applied to
the module. The Auto-Track function must either be disabled 3,
or the module’s output held off (for at least 50 ms) using the
Inhibit pin. Either approach ensures that the Track pin volt-
age is above the set-point voltage at start up.
Notes
1.Startup includes the short delay (approx.10 ms) prior
to the output voltage rising, followed by the rise of the
output voltage under the module’s internal soft-start
control. Startup is complete when the output voltage
has risen to either the set-point voltage or the voltage
at the Track pin, whichever is lowest.
2.To ensure that the regulator does not sink current when
power is first applied (even with a ground signal applied
to the Inhibit control pin), the input voltage must always
be greater than the output voltage throughout the
power-up and power-down sequence.
3.The Auto-Track function can be disabled at power up
by immediately applying a voltage to the module’s Track
pin that is greater than its set-point voltage. This can
be easily accomplished by connecting the Track pin to
Vin.
V
o = 2.5 V
V
IN = 3.3 V
R
2
2k21
ASIC
VCORE
VCCIO
I
o
PTH03010W
1
10
4
5
6
2
3
98
Track
V
IN
V
O
GND
Inhibit
7
Vadj
Sense
+
C
IN
330 F
+
C
OUT
330 F
+
Figure 3–9; Application Circuit Demonstrating Pre-Bias Startup
Vin (1 V/Div)
Vo (1 V/Div)
Io (5 A/Div)
HORIZ SCALE: 5 ms/Div
Figure 3–10; Pre-Bias Startup Waveforms
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