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參數(shù)資料
| 型號： | PTB48520WAS |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | DIP-10 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大?。?/td> | 427K |
| 代理商： | PTB48520WAS |
www.ti.com
PTB48520W
SLTS233A–NOVEMBER 2004–REVISED APRIL 2005
ELECTRICAL CHARACTERISTICS (continued)
(Unless otherwise stated, TA = 25°C, VI =48V,VO = 3.3 V, CO = 0 F, and IO =IOmax)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
OVP
Output overvoltage protection Output shutdown and latch off
125
%Vo
UVLO
Undervoltage lockout
30
34
36
V
S
Switching frequency
Over VI range
225
275
325
kHz
Internal input capacitance
3F
External output capacitance
Between both outputs and VO COM
0
5000
F
Isolation voltage
Input-output
1500
Vdc
Isolation capacitance
Input-output
1000
pF
Isolation resistance
Input-output
10
M
Telcordia SR-332 50% stress, TA = 40°C,
MTBF
Reliability
1.2
106 Hrs
ground benign
TERMINAL FUNCTIONS
TERMINAL
DESCRIPTION
NAME
NO.
The positive input for the module with respect to –VI. When powering the module from a negative input voltage,
+VI(1)
1
this input is connected to the input source ground.
The negative input supply for the module, and the 0-V reference for the VO Enable input. When powering the
–VI(1)
3
module from a positive source, this input is connected to the input source return.
An open-collector (open-drain) negative logic input that is referenced to –VI. This input must be pulled to –VI
potential to enable the output voltage. A high impedance connection disables the module output. If the output
VO Enable (1) (2)
2
enable feature is not used, pin 2 should be permanently connected to –VI. The module then produces an output
whenever a valid input source is applied.
Produces a positive power output with respect to VO COM. This is the main output from the converter when
operated in a stand-alone configuration. It is dc isolated from the input power pins and is the first output to rise
VO Bus
9
when the converter is either powered or enabled. In power-up sequencing applications, this output can provide
a 3.3-V standby source to power the downstream non-isolated modules.
This is the sequenced output voltage from the converter. This voltage can be directly controlled from the Track
VO Seq
10
pin. During power up, VO Seq rises with the Track pin voltage, typically 20 ms after the VO Bus output has
reached regulation.
This is the output power return for both the VO Bus and VO Seq output voltages. This node should be
VO COM
5
connected to the load circuit common.
The voltage at this pin directly controls the voltage VO Seq regulated output. It is primarily used to sequence
the voltage VO Seq with the regulated outputs from any downstream non-isolated modules that are powered
from the converter +VO Bus output. In these applications, the Track pin is simply connected to the track control
Track
4
of each of the non-isolated modules. The Track pin has an internal transistor, which holds it at VO COM
potential for approximately 20 ms after the VO Bus output is in regulation. Following this delay, the Track
voltage and VO Seq rises simultaneously with the output voltage of all the non-isolated modules that are under
the control of Auto-Track.
A resistor must be connected between this pin and –Sense to set the converter output voltage. A 0.05-W rated
resistor may be used, with tolerance and temperature stability of 1% and 100 ppm/°C, respectively. If this pin is
VO Adjust
7
left open, the converter output voltage defaults to its lowest value. The specification table gives the preferred
resistor values for the popular bus voltages.
The +Sense pin can be connected to either the VO Bus or VO Seq outputs. When connected to VO Seq, remote
sense compensation will be delayed until the power-up sequence is complete. The voltage at VO Bus is raised
+Sense
8
slightly. The pin may be left open circuit, but connecting it to one of the output terminals improves load
regulation of that output.
Provides the converter with a remote sense capability when used with +Sense. For optimum output voltage
–Sense
6
accuracy, this pin should always be connected to VO COM. This pin is also the reference connection for the
output voltage set-point resistor.
(1) These functions indicate signals electrically common with the input.
(2) Denotes negative logic: Low (–VI) = Normal operation, Open = Output off
4
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