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參數(shù)資料
| 型號： | UWR-3.3/8-D48A |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 6/10頁 |
| 文件大小： | 472K |
| 代理商： | UWR-3.3/8-D48A |
UWR Models
26-40W , SINGLE OUTPUT DC/DC CONVER TERS
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). The drive circuit should be able to sink appropriate
current (see Performance Specs) when activated and withstand appropriate
voltage when deactivated.
Applying an external voltage to pin 4 when no input power is applied to the
converter can cause permanent damage to the converter.
Sync Function (Optional)
Contact DATEL for further information.
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 specied accuracy band. Actual measured times will
vary with input source impedance, external input/output capacitance, and
load. The UWR 26-40 Watt implements a soft start circuit that limits the duty
cycle of the PWM controller at power up, thereby limiting the Input Inrush
current.
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
pin. The specication denes the interval between the time at which
the converter is turned on and the fully loaded output voltage enters
and remains within its specied accuracy band. 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 capacitance.
Input Overvoltage/Undervoltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate until
the ramping-up input voltage exceeds the Start-Up Threshold Voltage (35V
for "D48" models). Once operating, devices will not turn off until the input
voltage drops below the Undervoltage Shutdown limit (34V for "D48" models).
Subsequent re-start will not occur until the input is brought back up to the
Start-Up Threshold. This built in hysteresis prevents any unstable on/off
situations from occurring at a single input voltage.
Input voltages exceeding the input overvoltage shutdown specication listed
in the Performance/Functional Specications will cause the device to shut-
down. A built-in hysteresis of 0.6 to 1.6 Volts for all models will not allow the
converter to restart until the input voltage is sufciently reduced.
Current Limiting
When output power increases above the rated output current, (see Current
Limit in Performance/Functional Specications) the DC/DC converter will go
into a current limiting mode. In this condition the output voltage will decrease
proportionately with increases in output current, thereby maintaining a
somewhat constant power dissipation. This is commonly referred to as
power limiting. Current limit inception is dened as the point where the full-
power output voltage falls below the specied tolerance. See Performance/
Functional Specications. If the load current being drawn from the converter
is signicant enough, the unit will go into a short circuit condition. See "Short
Circuit Condition."
Short Circuit Condition
When a converter is in current limit mode the output voltages will drop as
the output current demand increases. 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 controller.
Following a time-out period the PWM will restart causing the output voltages
to begin ramping to their appropriate values. If the short-circuit condition
persists, another shutdown cycle will be initiated. This on/off cycling is
referred to as "hiccup" mode. The hiccup cycling reduces the average output
current, thereby preventing internal temperatures from rising to excessive
levels. The UWR 26-40 Watt A-Series is capable of enduring an indenite
short circuit output condition.
Thermal Shutdown
These A-Series converters are equipped with Thermal Shutdown Circuitry.
If environmental conditions cause the internal temperature of the DC/DC
converter to rise above the designed operating temperature, a precision
temperature sensor will power down the unit. When the internal temperature
decreases below the threshold of the temperature sensor the unit will self
start. See Performance/Functional Specications.
Output Overvoltage Protection
The output voltage is monitored for an overvoltage condition via magnetic
coupling to the primary side. If the output voltage rises to a fault condition,
which could be damaging to the load circuitry (see Performance Specica-
tions), the sensing circuitry will power down the PWM controller causing the
output voltage to decrease. Following a time-out period the PWM will restart,
causing the output voltage to ramp to its appropriate value. If the fault
condition persists, and the output voltages again climb to excessive levels,
the overvoltage circuitry will initiate another shutdown cycle. This on/off
cycling is referred to as "hiccup" mode.
4
2
1
+INPUT
–INPUT
ON/OFF
CONTROL
Figure 3. Driving the Negative Polarity On/Off Control Pin
5
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