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PTB48500 Datasheet(PDF) 2 Page - Texas Instruments

Part No. PTB48500
Description  Dual-Output, 48-V Input Isolated DC/DC Converter for xDSL
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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PTB48500 Datasheet(HTML) 2 Page - Texas Instruments

 
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Ordering Information
Package Options (PT4850xx
❒❒)
Code
Description
Pkg Ref. (1)
AH
Horiz. T/H
(ERH)
AS
SMD, Standard (2)
(ERJ)
Output Voltage (PTB4850x
xx)
Code
Voltage
A
3.3 V / 1.2 V
Notes:
(1) Reference the applicable package reference drawing for the dimensions and PC board layout
(2) “Standard” option specifies 63/37, Sn/Pb pin solder material.
Pin Descriptions
+VI: The positive input supply for the module with respect
to –Vin. When powering the module from a –48 V telecom
central office supply, this input is connected to the primary
system ground.
–VI: The negative input supply for the module, and the
0 VDC reference for the ‘Enable’, ‘EN Out’, and ‘Sync
Out’ signals. When the module is powered from a +48-V
supply, this input is connected to the 48-V Return.
VO 1: The higher regulated power output voltage, which
is referenced to the COM node.
V0 2: The lower regulated power output voltage, which
is referenced to the COM node.
COM:
The secondary return reference for the module’s two
regulated output voltages. It is dc isolated from the input
supply pins.
VO 2 Adjust: Using a single resistor, this pin allows Vo2 to
be adjusted higher or lower than the preset value. If not
used, this pin should be left open circuit.
Enable:
This is an open-collector (open-drain) positive
logic input that enables the module output. This pin is
referenced to -Vin. A logic ‘0’ at this pin disables the
module’s outputs, and a high impedance enables the out-
puts. If not used the pin should be left unconnected.
EN Out:
This open-collector output may be used to enable
the output of other DC/DC converters in applications
where the power-up sequence of the related voltages must
be precisely controlled. The output is used principally to
control the startup up of a PTB4851xx module when
powering ADSL circuits based on the AC7 chipset. The
signal is referenced to -Vin, and is active low. It is initially
‘off’ (high impedance), and turns ‘on’ when the output
voltage, Vo1, has risen to its nominal set-point voltage.
Sync Out:
The signal generated by this pin is designed to
be used exclusively with the PTB48510 in AC7 ADSL
applications. When the ‘Sync Out’ of this converter is
connected directly to the ‘Sync In’ pin of the PTB48510,
both modules will operate at the same switch conversion
frequency.
POR*:
(Available to PTB48500 and PTB48501 only!)
This pin produces an active-low power-on reset signal
that may be used to reset logic circuitry. The output is
set low during power up just as the output voltage from
Vo1 starts to rise. It remains low for 10 ms after the volt-
age at Vo1 has reached its nominal set-point voltage.
This signal is referenced to the COM node, and has a
3.3-k
Ω internal pull-up resistor to Vo1.
Environmental and General Specifications (Unless otherwise stated, all voltages are with respect to –Vin)
Characteristics
Symbols
Conditions
Min
Typ
Max
Units
Input Voltage Range
Vin
Over output load range
36
48
75
VDC
Isolation Voltage
Input–output/input–case
1500
V
Capacitance
Input to output
1500
pF
Resistance
Input to output
10
M
Operating Temperature Range
Ta
Over Vin Range
–40
+85
°C
Over-Temperature Protection
OTP
Shutdown threshold
115
°C
Hysterisis
10
Solder Reflow Temperature
Treflow
Surface temperature of module body or pins
235 (i)
°C
Storage Temperature
Ts
–40
125
°C
Mechanical Shock
Per Mil-STD-883D, Method 2002.3
500
G’s
1 msec, ½ Sine, mounted
Mechanical Vibration
Mil-STD-883D, Method 2007.2
Suffix H
20
G’s
20-2000 Hz
Suffix C
5
Weight
20
grams
Flammability
Meets UL 94V-O
Notes:
(i) During reflow of SMD package version do not elevate peak temperature of the module, pins or internal components above the stated maximum.
Base Part No. (PTB4850
xxx)
Order Prefix
Description
PTB48500xxx
13 A
(32-Ports)
PTB48501xxx
16.5 A
(48/64-Ports)
PTB48502xx
21 A
(64-Ports + 10 W)
Dual-Output, 48-V Input Isolated
DC/DC Converter for xDSL
PTB48500, PTB48501, PTB48502
SLTS218B - SEPTEMBER 2003 - REVISED NOVEMBER 2004


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