TC110 データシートの表示（PDF） - Microchip Technology

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TC110

PFM/PWM Step-Up DC/DC Controller

Microchip Technology 

TC110

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

Surface Mount

Inductors

Sumida

CD54 Series (300kHz)

CD75 (100kHz)

Coiltronics

CTX Series

Through-Hole

Sumida

RCH855 Series

RCH110 Series

Renco

RL1284-12

Capacitors

Matsuo

267 Series

Sprague

595D Series

Nichicon

F93 Series

Sanyo

OS-CON Series

Nichicon

PL Series

Diodes

Nihon

EC10 Series

Matsushita

MA735 Series

ON Semiconductor

1N5817 - 1N5822

Transistors

N-channel

Silconix

Si9410DY

ON Semiconductor

MTP3055EL

MTD20N03

NPN

Zetex

ZTX694B

DS21355B-page 8

© 2002 Microchip Technology Inc.

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