PT3660 Series
30-A Dual Output Isolated
DC/DC Converter
SLTS181 OCTOBER 2002
Pin-Out Information
Pin Function
On/Off Logic
Pin 3 Pin 4
Output Status
Pin
Function
Pin
Function
1
2
3
4
5
6
7
8
9
+V
-V
10
+Vo1
in
19
COM
1
0
×
×
1
0
Off
On
Off
11
12
13
14
15
16
17
18
+Vo1
in
20
21
22
23
24
25
26
Vo2 Adjust
+Vo2
EN 1
+Vo1
EN 2
Vo1 Adjust
COM
COM
COM
COM
COM
+Vo2
TEMP
+Vo2
Notes:
Logic 1 =Open collector
Logic 0 = –Vin (pin 2) potential
AUX
+Vo2
Do Not Connect
Do Not Connect
+Vo1
Do Not Connect
Do Not Connect
For positive Enable function, connect pin 3
to pin 2 and use pin 4.
For negative Enable function, leave pin 4
open and use pin 3.
Note: Shaded functions indicate signals that are
referenced to the input (-Vin) potential.
Pin Descriptions
+Vin: The positive input supply for the module with
respect to –Vin. When powering the module from a
–48V telecom central office supply, this input is
connected to the primary system ground.
voltage, and is independant of the enable logic status.
(Note: A load impedance of less than 1MΩ will adversly
affect the module’s over-temperature shutdown threshold.
Use a high-impedance input when monitoring this
signal.)
–Vin: The negative input supply for the module, and
the 0VDC reference for the EN 1, EN 2, TEMP, and
AUX signals. When the module is powered from a
+48V supply, this input is connected to the 48V–Return.
AUX: Produces a regulated output voltage of 11.6V
5%, which is referenced to –Vin. The current drawn
from the pin must be limited to 10mA. The voltage
may be used to indicate the output status of the
module to a primary referenced circuit, or power a
low-current amplifer.
EN 1: The negative logic input that enables the
module output. This pin is TTL compatible and
referenced to –Vin. A logic ‘0’ at this pin enables the
module’s outputs. A logic ‘1’ or high impedance
disables the module’s outputs. If not used, the pin
must be connected to –Vin.
Vo1: The higher regulated output voltage, which is
referenced to the COM node.
Vo2: The lower regulated output voltage, which is
EN 2: The positive logic input that enables the
module output. This pin is TTL compatible and
referenced to –Vin. A logic ‘1’ or high impedance
enables the module’s outputs. If not used, the pin
should be left open circuit.
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.
Vo1 Adjust: Using a single resistor, this pin allows Vo1
to be adjusted higher or lower than the preset value.
If not used, this pin should be left open circuit.
TEMP: This is the output voltage produced by the
module’s internal temperature sensor. The voltage at
this pin is referenced to –Vin and rises approximately
10mV/°C from an intital value of 0.1VDC at –40°C
(Vtemp =0.5 + 0.01·Tsense). The signal is available
whenever the module is supplied with a valid input
Vo2 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.
For technical support and more information, see inside back cover or visit www.ti.com
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