QHS40ZD-NT POWER ONE, QHS40ZD-NT Datasheet - Page 7

• Manufacturer Part Number: QHS40ZD-NT
• Description: CONV DC-DC 48V IN 2.5V OUT 100W
• Manufacturer: POWER ONE
• Series: QHSr
• Type: Isolatedr

Specifications of QHS40ZD-NT

• Output: 2.5V
• Number Of Outputs: 1
• Power (watts): 100W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: 8-DIP Module
• 1st Output: 2.5 VDC @ 40A
• Size / Dimension: 2.28" L x 1.45" W x 0.50" H (57.9mm x 36.8mm x 12.7mm)
• Power (watts) - Rated: 100W
• Operating Temperature: -40°C ~ 100°C
• Efficiency: 88%
• Approvals: CSA, TUV, UL
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• 3rd Output: -
• 2nd Output: -
• 4th Output: -
• Other names: 179-2232

Typical Application
Figure 9 shows the recommended connections for the
QHS Series converter.
The QHS Series converters do not require any external
components for proper operation.
distribution of the input voltage to the converter contains
significant inductance, the capacitor C1 may be
required to enhance performance of the converter. A
minimum of a 33 μF electrolytic capacitor with the
ESR<0.7Ω is recommended for the QHS Series.
Refer to the “Inrush Current Control Application Note”
on www.power-one.com for suggestions on how to limit
the magnitude of the inrush current.
For output decoupling we recommend using a 10 μF
tantalum and a 1 μF ceramic capacitors connected
directly across the output pins of the converter. Note,
that the capacitors do not substitute the filtering
required by the load.
Shutdown Feature Description
The ON/OFF pin in the QHS Series converters
functions as a normal soft shutdown. It is referenced to
the –Vin pin (see Figure 7). With the positive logic,
when the ON/OFF pin is pulled low, the output is turned
off and the unit goes into a very low input power mode.
With negative logic, when the ON/OFF pin is pulled low,
the unit is turned on.
An open collector switch is recommended to control the
voltage between the ON/OFF pin and the -Vin pin of the
converter. The ON/OFF pin is pulled up internally, so
no external voltage source is required. The user should
avoid connecting a resistor between the ON/OFF pin
and the +Vin pin.
When the ON/OFF pin is used to achieve remote
control, the user must take care to insure that the pin
reference for the control is really the -Vin pin.
control signal must not be referenced ahead of EMI
MCD10047 Rev. 1.0
Figure 9. Typical Application of the QHS Series
Fuse
C1
On/Off
+Vi
-Vi
QHS40ZX
+Sense
-Sense
Trim
+Vo
-Vo
C2
However, if the
C3
Page 7 of 10
The
filtering, or remotely from the unit.
coupling the information and locating the optical
coupler directly at the module will solve any of
these problems.
Note:
If the ON/OFF pin is not used, it can be left floating (positive
logic), or connected to the -Vin pin (negative logic).
Output Voltage Trim
Industry Standard Trim
The units trim up with a resistor from the TRIM pin
to the +Sense pin and trim down with a resistor
from the TRIM pin to the –Sense pin as shown in
Figure 10.
The equations below determine the trim resistor
value required to achieve a ΔV change in the
output voltage.
where ΔV% is the output voltage change
expressed in percents of the nominal output
voltage, Vout.
Notes:
Radj
Radj
QHS DC-DC Series Data Sheet
Figure 10. QHS Series Positive Trim Schematic
−
−
up
down
=
⎛
⎜
⎝
=
5
1 .
⎛
⎜
⎝
Vo
510
Δ
. 1
%
(
225
100
−
10
Δ
+
%
.
) 2
Δ
%)
www.power-one.com
⎞
⎟
⎠
k
Ω
−
510
Δ
%
−
Optically
10
.
) 2
⎞
⎟
⎠
k
Ω