Datasheet > QHS40ZDN-T8

QHS40ZDN-T8

更新时间： 2023-08-15 00:00:00

品牌	Logo	应用领域
BEL		/
页数	文件大小	规格书
10页	206K
描述
DC-DC Regulated Power Supply Module, 1 Output, 10W, Hybrid, PACKAGE-8

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QHS40ZDN-T8 数据手册

QHS DC-DC Series Data Sheet

filtering, or remotely from the unit. Optically

coupling the information and locating the optical

coupler directly at the module will solve any of

these problems.

Typical Application

Figure 9 shows the recommended connections for the

QHS Series converter.

Note:

QHS40ZX

If the ON/OFF pin is not used, it can be left floating (positive

logic), or connected to the -Vin pin (negative logic).

Fuse

+Vo

+Vi

+Sense

Output Voltage Trim

C2 C3

Trim

On/Off

-Vi

-Sense

-Vo

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.

Figure 9. Typical Application of the QHS Series

The QHS Series converters do not require any external

components for proper operation. However, if the

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.

Figure 10. QHS Series Positive Trim Schematic

Shutdown Feature Description

The equations below determine the trim resistor

value required to achieve a ΔV change in the

output voltage.

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.

5.1Vo(100 + Δ%) 510

⎛

⎜

⎞

Radj − up =

−

−10.2) kΩ

⎟

1.225Δ%

Δ%

⎝

⎠

With negative logic, when the ON/OFF pin is pulled low,

the unit is turned on.

510

⎛

⎜

⎞

⎠

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.

Radj − down =

−10.2) kΩ

⎟

Δ%

⎝

where ΔV% is the output voltage change

expressed in percents of the nominal output

voltage, Vout.

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. The

control signal must not be referenced ahead of EMI

Notes:

DEC 09, 2004 revised to APR 12, 2006

Page 7 of 10

www.power-one.com

1...4 5 678 9 10

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