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GS-R412/2 Datasheet(PDF) 3 Page - STMicroelectronics

Part No. GS-R412/2
Description  SMALL SIZE STEP-DOWN SWITCHING REGULATOR FAMILY
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

GS-R412/2 Datasheet(HTML) 3 Page - STMicroelectronics

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USER NOTES
Input Voltage
The recommended operating maximum DC input
voltage is 40V inclusive of the ripple voltage.
Case Grounding
The module case is internally connected to pin 2
and pin 3.
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-R400/2 modules is about 8
°C/W. This produces
a 32
°C temperature increase of the module surface
for 4W 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
capability of 2.5 ARMS with a working voltage of 50
VDC and an ESR of 0,1
Ω at 100kHz. When space
is a limitation a 22
µF ceramic multilayer capacitor
must be connected to the module input pins.
Output Voltage Programming
The GS-R400V/2 output voltage is programmed by
using a resistor.
The resistor must be located very close the module
and the PCB layout must minimize injected noise.
The value of the resistor is calculated by using the
following formula:
Rv
= 2.67
Vo
5.1
− 1
k
Vo can be adjusted between 5.1 and 24V.
Module Protection
The modules are protected against occasional and
permanent short circuits of the output pins to
ground. During short circuit (when the output cur-
rent exceeds the maximum value) the output is
automatically disabled. After a fixed time the module
starts again in a soft mode. The cycle is repeated
until the short circuit condition is removed.
The module can be permanently damaged if the
case temperature exceeds 85
° C
Power Derating Curve
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
© 1994 SGS-THOMSON Microelectronics – All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
GS-R400/2 FAMILY


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