910.24 Datasheet, PDF (2/2 Pages) ELMOS Semiconductor AG – DC/DC Converter adjustable, wide input range pfm controller

DC/DC Converter
adjustable, wide input range
pfm controller
package
SO 8
PGND
1
AGND
2
ISEN
3
VFB
4
8
MDRV
7
VSM
6
VS
5
ON
910.24/25/26
pinning
Pin
Name
1
PGND
2
AGND
3
ISEN
4
VFB
5
ON
6
VS
7
VSM
8
MDRV
Description
Driver power ground pin. Connect pin to the current sense resistor, the
(-) terminal of the input capacitor and the (-) terminal of the output capacitor.
Due to high currents, and high frequency operation of the IC, a low impedance
circuit ground plane is highly recommended
Analog ground pin. This pin provides a clean ground for the controller circuitry:
The output voltage sensing resistors should be connected to this ground pin.
This pin is connected to the IC substrate. Connect to the (-) terminal of the output capacitor
Current sense input pin. Voltage generated across an external sense resistor is
fed into this pin. Filters extensive high-frequency noise
Positive feedback pin. Connect to SMPS output via external resistor divider
to set output voltage and is referenced to 1.22V. For best stability, keep VFB
lead as short as possible and VFB stray capacitance as small as possible
Switch ON input. Tie this pin to ground to force the IC into idle mode.
A voltage of VSM or higher switches the controller in operating mode
Main supply input. Filters out high-frequency noise with a 100nF
ceramic capacitor placed close to the pin to PGND
Internal 5V regulator output. The driver and all control circuits are
powered from this voltage. Decouple this pin to PGND with a minimum of
4.7µF tantalum and 100nF ceramic capacitors
Drive output. Drives the gate of the external MOSFET between PGND and VSM.
Connect the external MOSFET via a damping resistor to this pin
Note:
ELMOS Semiconductor AG (below ELMOS) reserves the right to make changes to the product contained in this publication without notice. ELMOS assumes no responsibility for the use of any circuits described
herein, conveys no licence under any patent or other right, and makes no representation that the circuits are free of patent infringement. While the information in this publication has been checked, no responsibility,
however, is assumed for inaccuracies.
ELMOS does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of a life-support system or to
significantly affect its safety or effectiveness. Products are not authorized for use in such applications.
ELMOS Semiconductor AG
Heinrich-Hertz-Str. 1 • 44227 Dortmund • Germany
Phone: [phone] • Fax: [phone]
eMail: [e-mail] • Internet: www.elmos.de
ELMOS France S.A.
29, rue des Peupliers • 92752 Nanterre Cedex • France
Phone: [phone] • Fax: [phone]
eMail: [e-mail] • Internet: www.elmos.de
ELMOS North America, Inc.
2747 Albright • Kokomo, Indiana 46902 • USA
Phone: [phone] • Fax: [phone]
eMail: [e-mail] • Internet: www.elmosna.com
Copyright © 2004 ELMOS: Reproduction, in part or whole, without the prior written consent of ELMOS, is prohibited.
ELMOS Product catalog 10/2004 | 17