Q2D25ZGE-C4
| Model | Q2D25ZGE-C4 |
| Description | 2-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PDF file | Total 13 pages (File size: 196K) |
| Chip Manufacturer | BEL |
Q2D Series – Quarter-Brick DC/DC Converter
48V Input
Dual Output
Note 1: Both outputs are trimmed up or down
simultaneously.
Trim Resistor
(Vout Increase)
Δ
[%]
R
T-INCR
[kΩ]
1
54.9
2
24.9
3
14.3
4
9.31
5
6.34
6
4.32
7
2.80
8
1.69
9
0.825
10
0
Data Sheet
preventing deep discharging of batteries used in
telecom applications.
Output Over-Current Protection (OCP)
The converter is protected against over-current or
short circuit conditions on both outputs. Upon
sensing an over-current condition, the converter
will switch to constant current operation and
thereby begin to reduce output voltages. If, due
to current limit, the output voltage Vout1 (3.3 V)
drops, than Vout2 (5.0 V) will follow Vout1 with
less than 1 V difference. Drop on Vout2 output
due to current limit will not affect voltage on
Vout1. For further load increase, if either Vout1
drops below 1 Vdc or Vout2 drops below 2 Vdc,
the converter will shut down.
Once the converter has shut down, it will attempt
to restart nominally every 100 ms with a 2% duty
cycle. The attempted restart will continue
indefinitely until the overload or short circuit
conditions are removed or the output voltage
Vout1 rises above 1 Vdc and Vout2 above 2 Vdc.
Output Over-Voltage Protection (OVP)
Trim Resistor
(Vout Decrease)
Δ
[%]
R
T-DECR
[kΩ]
-1
68.1
-2
30.1
-3
17.8
-4
11.5
-5
7.68
-6
5.36
-7
3.48
-8
2.10
-9
1.05
-10
0
The converter will shut down if the output voltage
across either Vout1(+) (Pin 4) or Vout2(+) (Pin 7)
and RETURN (Pin 5) exceeds the threshold of the
OVP circuitry. The OVP protection is separate for
Vout1 and Vout2 with their own reference
independent of the output voltage regulation
loops. Once the converter has shut down, it will
attempt to restart every 100 ms until the OVP
condition is removed.
Over-Temperature Protection (OTP)
The converter will shut down under an over-
temperature condition to protect itself from
overheating caused by operation outside the
thermal derating curves, or operation in abnormal
conditions such as system fan failure.
The over-temperature protection circuit turns the
converter off when the temperature at a sensed
location reaches 120°C (typical). Once the
converter has shut down, it will restart when the
temperature at the sensed location falls below
110°C.
Note 2: The above trim resistor values match
those typically used in industry-standard dual
quarter bricks.
Input Under-Voltage Lockout
Input under-voltage lockout is standard with this
converter. The converter will shut down when the
input voltage drops below a pre-determined
voltage.
The input voltage must be at least 35 V for the
converter to turn on. Once the converter has been
turned on, it will shut off when the input voltage
drops below 31 V. This feature is beneficial in
Rev. JUN 06, 2002
Page 9 of 13
