TS30021 datasheet(13/19 Pages) ETC2

13 / 19 page

TRIUNE SYSTEMS PROPRIETARY & CONFIDENTIAL INFORMATION

- 13 -

TS30021/22/23

Version 1.5

Specifications subject to change

WWW.TRIUNESYSTEMS.COM

TYPICAL APPLICATION SCHEMATIC

VCC

BST

VSW

FBSW

FBLDO

VOLDO

Lout

Cout

VOUT

CBST

VOUT_LDO

Cout_LDO

RTOP

RBOT

(Optional)

10k

VOUT

Adjustable Switcher Output

VCC

Cbypass

RTOPSW

RBOTSW

VLDO

Cbypass-LDO

Figure 22: TS30021/22/23 Application Schematic

A minimal schematic suitable for most applications is shown on page 1. Figure 22 includes optional

components that may be considered to address specific issues as listed in the External Component

Selection section.

PCB LAYOUT

For proper operation and minimum EMI, care must be taken during PCB layout. An improper layout can lead to issues such as

poor stability and regulation, noise sensitivity and increased EMI radiation. The main guidelines are the following:



provide low inductive and resistive paths for loops with high di/dt,



provide low capacitive paths with respect to all the other nodes for traces with high di/dt,



sensitive nodes not assigned to power transmission should be referenced to the analog signal ground (GND) and be

always separated from the power ground (PGND).

The negative ends of CBYPASS, COUT and the Schottky diode DCATCH (optional) should be placed close to each other and connected

using a wide trace. Vias must be used to connect the PGND node to the ground plane. The PGND node must be placed as close as

possible to the TS30021/22/23 PGND pins to avoid additional voltage drop in traces.

The bypass capacitor CBYPASS (optionally paralleled to a 0.1µF capacitor) must be placed close to the VCC pins of

TS30021/22/23.

The inductor must be placed close to the VSW pins and connected directly to COUT in order to minimize the area between the

VSW pin, the inductor, the COUT capacitor and the PGND pins. The trace area and length of the switching nodes VSW and BST

should be minimized.

For the adjustable output voltage version of the TS30021/22/23, feedback resistors RBOTSW and RTOPSW are required for Vout

settings greater than 0.8V and should be placed close to the TS30021/22/23 in order to keep the traces of the sensitive node FB

as short as possible and away from switching signals. RBOTSW should be connected to the analog ground pin (GND) directly and

should never be connected to the ground plane. The analog ground trace (GND) should be connected in only one point to the

power ground (PGND). A good connection point is under the TS30021/22/23 package to the exposed thermal pad and vias

which are connected to PGND. RTOPSW will be connected to the VOUT node using a trace that ends close to the actual load.

TS30021 bảng dữ liệu(PDF) 13 Page - List of Unclassifed Manufacturers

TS30021 bảng dữ liệu(HTML) 13 Page - List of Unclassifed Manufacturers

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

bảng dữ liệu tải về

Link URL