TC110 datasheet(8/16 Pages) MICROCHIP

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TC110

DS21355B-page 8

4.0

APPLICATIONS

4.1

Circuit Examples

Figure 4-1 shows a TC110 operating as a 100kHz

bootstrapped regulator with soft start. This circuit uses

an NPN switching transistor (Zetex FZT690B) that has

an hFE of 400 and VCESAT of 100 mV at IC = 1A. Other

high beta transistors can be used, but the values of RB

and CB may need adjustment if hFE is significantly

different from that of the FZT690B.

Figure 4-2 and Figure 4-3 both utilize an N-channel

switching transistor (Silconix Si9410DY). This transistor

is a member of the LittlefootTM family of small outline

MOSFETs. The circuit of Figure 4-2 operates in

bootstrapped mode, while the circuit of Figure 4-3

operates in non-bootstrapped mode.

TABLE 4-1:

SUGGESTED COMPONENTS AND SUPPLIERS

Type

Inductors

Capacitors

Diodes

Transistors

Surface Mount

Sumida

CD54 Series (300kHz)

CD75 (100kHz)

Coiltronics

CTX Series

Matsuo

267 Series

Sprague

595D Series

Nichicon

F93 Series

Nihon

EC10 Series

Matsushita

MA735 Series

N-channel

Silconix

Si9410DY

ON Semiconductor

MTP3055EL

MTD20N03

Through-Hole

Sumida

RCH855 Series

RCH110 Series

Renco

RL1284-12

Sanyo

OS-CON Series

Nichicon

PL Series

ON Semiconductor

1N5817 - 1N5822

NPN

Zetex

ZTX694B

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