Product Manual

2 WELCH ALLYN UNIVERSAL DESK CHARGER SERVICE MANUAL 711380 REV. D
1.3.1 Absolute Maximum Ratings
Input Voltage Range: 100VACRMS to 240VACRMS,
50Hz or 60HZ.
Peak Input Voltage: 275VACRMS (limited by
LM317T max voltage spec and
transformer design) It is only
guaranteed to maintain SELF
internal voltages up to 240V,
which is its highest rated input.
Output Voltage: 0V – Open Circuit Voltage
(Output may be dragged below
zero volts if input voltage is
less than the peak input volt-
age)
Output Current: 0 mA to +100 mA (internally
limited to 80 mA for short
circuit)
Operating Temperature: 5 - 35 Degrees Celsius *, 10%
- 90% Relative Humidity
Storage Temperature:
-20 - +50 Degrees Celsius *,
10% - 90% Relative Humidity
* This may not be a suitable range for the batteries under
charge.
1.3.2 Operating Conditions
Output Voltage: <10VDC (no load)
Current Limit: 55 mA to 80 mA
Power Consumption (No Load): 7W Max (high line transformer
losses, no load)
Power Consumption (Full Load):10W Max (high line PCB
resistor, transistor, LED, and
LM317 at max Load)
Power Dissipation: Internally Limited to 17W
(Assumes full transformer
loss
at dual short circuit)
1.3 Hardware Electri-
cal Specifications