BWR Series
15-17W, Dual Output DC/DC Converters
If loading from +/– Outputs to Output Return is symmetrical, the voltage at
Output pins with respect to Output Return will also be symmetrical0An unbal-
ance in loading will consequently result in a degraded VOUT regulation accuracy
from +/– Outputs to Output Return ( –Output to +Output regulation will still be
within specification) with a load step from minimum to maximum load and with
the other output at full load, the maximum deviation is 20±ꢁ VOUT nominal0
Start-Up Time
The VIN to VOUT start-up time is the interval of time where the input voltage crosses
the turn-on threshold point, and the fully loaded output voltage enters and remains
within its specified accuracy band0 Actual measured times will vary with external
output capacitance and load0 The BWR ꢀ±-ꢀ7W Series implements a soft start
circuit that limits the duty cycle of the PWM controller at power up, thereby limiting
the Input Inrush current0
BWR-15/575-D48A Unbalanced Output Load Regulation
ꢀ±0±
The On/Off Control to VOUT start-up time assumes the converter has its nominal
input voltage applied but is turned off via the On/Off Control pin0 The specification
defines the interval between the time at which the converter is turned on and the
fully loaded output voltage enters and remains within its specified accuracy band0
Similar to the VIN to VOUT start-up, the On/Off Control to VOUT start-up time is also
governed by the internal soft start circuitry and external load capacitance0
ꢀ±04
+15V@ 0A to 0.575A
–15V@ 0.575A
ꢀ±03
ꢀ±02
ꢀ±0ꢀ
ꢀ±
On/Off Control
The input-side, remote On/Off Control function (pin 3) can be ordered to operate
with either polarity0 Positive-polarity devices ("C" suffix) are enabled when pin
3 is left open (or is pulled high, +ꢀ3V to VIN applied with respect to –Input, pin
2, see Figure 2)0 Positive-polarity devices are disabled when pin 3 is pulled low
(5-508V with respect to –Input)0 Negative-polarity devices are off when pin 3 is
left open (or pulled high, 30±V to VIN), and on when pin 3 is pulled low (5-50±V)0
See Figure ±0
–15V@ 0A to 0.575A
+15V@ 0.575A
ꢀ409
ꢀ408
ꢀ407
5
ꢀ5
25
35
45
±5
65
75
85
95
ꢀ55
Output Load Regulation (%)
+INPUT
1
Figure 4. Output Voltage Accuracy vs. Imbalanced Loading
13V CIRCUIT
5V CIRCUIT
Current Limiting
3
When output current increases to approximately ꢀ±ꢁ to ±5ꢁ above the rated
output current, the DC/DC converter will go into a current limiting mode0 In
this condition the output voltage will decrease proportionately with increases
in output current, thereby maintaining a somewhat constant power dissipa-
tion0 This is commonly referred to as power limiting0 Current limit inception
is defined as the point where the full-power output voltage falls below the
specified tolerance0 See Performance/Functional Specifications0 If the load
current being drawn from the converter is significant enough, the unit will go
into a short circuit condition0 See "Short Circuit Condition0"
ON/OFF
CONTROL
–INPUT
2
Figure 4. Driving the Positive Polarity On/Off Control Pin
Short Circuit Condition
+INPUT
1
3
When a converter is in current limit mode the output voltages will drop as
the output current demand increases0 If the output voltage drops too low, the
magnetically coupled voltage used to develop primary side voltages will also
drop, thereby shutting down the PWM controller0
ON/OFF
CONTROL
Following a time-out period, the PWM will restart, causing the output voltages
to begin ramping to their appropriate values0 If the short-circuit condition
persists, another shutdown cycle will be initiated0 This on/off cycling is
referred to as "hiccup" mode0 The hiccup cycling reduces the average output
current, thereby preventing internal temperatures from rising to excessive
levels0 The BWR ꢀ±-ꢀ7W Series is capable of enduring an indefinite short
circuit output condition0
–INPUT
2
Figure 5. Driving the Negative Polarity On/Off Control Pin
Dynamic control of the remote on/off function is best accomplished with a
mechanical relay or an open-collector/open-drain drive circuit (optically isolated
if appropriate)0 The drive circuit should be able to sink appropriate current (see
Performance Specs) when activated and withstand appropriate voltage when
deactivated0
Thermal Shutdown
These BWR converters are equipped with Thermal Shutdown Circuitry0 If
environmental conditions cause the internal temperature of the DC/DC con-
verter rises above the designed operating temperature, a precision tempera-
ture sensor will power down the unit0When the internal temperature decreases
below the threshold of the temperature sensor the unit will self start0
Applying an external voltage to pin 3 when no input power is applied to the
converter can cause permanent damage to the converter0
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