AS1341 austriamicrosystems AG, AS1341 Datasheet - Page 13

• Manufacturer Part Number: AS1341
• Description: Step-Down Converter
• Manufacturer: austriamicrosystems AG

www.datasheet4u.com
AS1341
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
Diode Selection
The current in the D1
turns off. To avoid excessive losses, the diode must have a fast turn-on time and a low forward voltage.
Note: Ensure that the diode peak current rating exceeds the peak current limit set by the current limit
Stable Operation
A well-designed system and selection of high-quality external components can eliminate excessive noise on pins OUT,
FB, or GND, which can lead to unstable device operation. Instability typically manifests itself as grouped switching
pulses with large gaps and excessive low-frequency output ripple (motorboating) during no-load or light-load condi-
tions.
Recommended Components
Table 8. Recommended Components
PC Board Layout and Grounding
High switching frequencies and large peak currents make PC board layout an important part of AS1341-based
designs. Good PCB layout can avoid switching noise being introduced into the feedback path, resulting in jitter, insta-
bility, or degraded performance.
www.austriamicrosystems.com
Circuit
- High-power traces
- The current loops formed by the external components (C
- Separate noisy traces, such as the LX node, from the feedback network with grounded copper.
- Keep the extra copper on the PCB and integrate it into a pseudo-ground plane.
- When using external feedback, place the resistors as close to pin FB as possible to minimize noise coupling.
1
2
3
4
5
be as short as possible to avoid radiated noise. Connect the ground pins of these power components at a com-
mon node in a star-ground configuration.
Current Limit on page
Voltage (V)
4.5 to 20
4.5 to 12
4.5 to 20
4.5 to 12
6 to 20
Input
(see Figure 22 on page 10)
(see Figure 22 on page 10)
Voltage (V)
1.25 to 5
1.25 to 5
5 to V
Output
10), and that its breakdown voltage exceeds V
IN
High or Low
ILIMIT
High
Low
changes abruptly from zero to its peak value each time the LX switch
should be as short and wide as possible.
Revision 1.00
CDRH5D18NP-4R1
CDRH6D28NP-150
CDRH6D28NP-470
CDRH5D18NP-220
LQH55DN-150M03
LQH55DN-470M03
LQH66SN-100M03
LQH66SN-470M03
IN
MSS6132-103ML
MSS6132-393ML
MSS6132-103ML
LPS4018-472ML
LPS4018-223ML
, C
See Circuit 1-4
OUT
Inductor
, L1, and D1 see
IN
. Schottky diodes are recommended.
Figure 22 on page
A700V826M006ATE018
A700V226M006ATE028
T520V107M010ATE018
T520B107M006ATE040
T520A336M006ATE070
510X107M020ATE040
Output Capacitor
EEFCD0K330R
EEFUD0J101R
10TPB100ML
6TPB47M
(see Setting
10) should
13 - 16