3/5

°C unless otherwise specified)

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

∆Vo/∆T

Temperature Stability

Vi = Vo+8V Io = 1A

0.2/1.6

mv/

°C

Io

Output Current

Vi = Vo+8V

0.2

4

A

IoL

Current Limit

Vi = Vo+8V

58

A

Iisc

Average Input Current

Vi = 46V Output Shorted

0.1

0.2

A

fs

Switching Frequency

Io = 1A

100

KHz

SVR

Supply Voltage Rejection

fo = 100Hz Io =1A

4/12

mV/V

Vr

Ripple Voltage

Io = 2A

25/150

mVpp

tss

Soft Start Time

Vi = Vo+8V

10/35

ms

Vinhl

Low Inhibit Voltage

0.8

V

Vinhh

High Inhibit Voltage

2

5.5

V

Iinhh

High Inhibit Input Current

Vinh = 5V

500

µA

tcb

Crow-bar Delay Time

5

µs

Vrh*

Reset High Level

5V

Vrl*

Reset Low Level

Irl = 5mA

Irl = 10mA

0.2

0.4

V

trd*

Reset Delay Time

100

ms

Vcth

Crowbar Intervention Threshold

Vo•1.25

V

∆Vo

Total Remote

Sense Compensation

500

mV

Rth

Thermal Resistance

Case to ambient

5

°C/W

* GS-R405S only

USER NOTES

Input Voltage

The recommended operating maximum DC input

voltage is 46V inclusive of the ripple voltage.

Remote Sensing

The remote voltage sense compensation range is

for a total drop of 500mV equally shared between

the load connecting wires. It is a good practice to

shield the sensing wires to avoid oscillation.

Each sense input must be connected to its compan-

ion output power pin when the remote sense capa-

bility is not used (see fig. 1).

Case Grounding

The module case is isolated from the electrical

circuit of the switching regulator. It can be grounded

using the 4 corner pins.

The PCB area below the module can be used as an

effective sixth side shield against EMI.

Thermal Characteristics

The case-to-ambient thermal resistance of all the

GS-R400 modules is about 5

°C/W. This produces

a 50

°C temperature increase of the module surface

for 10W of internal power dissipation.

Depending on the ambient temperature and/or on

the power dissipation, an additional heatsink or

forced ventilation may be required.

Input Impedance

The module has an internal capacitor connected

between the input pins in order to assure PWM

stability. This capacitor cannot handle large values

of high frequency ripple current and it can be per-

manently damaged if the primary energy source

impedance is not adequate. The use of an external

low ESR, high ripple current capacitor located as

close the module as possible is recommended.

Suitable capacitors should have a RMS current

Ω at 100 kHz. When space

GS-R400 FAMILY