SMM105NECR01 データシートの表示（PDF） - Summit Microelectronics

部品番号

コンポーネント説明

メーカー

SMM105NECR01

Single-Channel Supply Voltage Marginer and Active DC Output Controller

Summit Microelectronics 

SMM105

Preliminary Information

APPLICATIONS INFORMATION (CONTINUED)

+12VIN (+10V to +15V)

RTRIM(R3) is calculated as follows:

VTRIMlow=0.3V, Regulator VREF=0.8V

C4

0.1uF

C7

0.01uF

The current through R3 is ITRIM=(0.8-0.3)/RTRIM

(ITRIM)(R4) > 15% of VOUT

C8

RTRIMmax should be < the calculated value

0.1uF

For Example:

If Vout=3.3V, R4=63.4K, 15% of Vout=0.5V

R6 10K

R7 10K

ITRIM=8uA, RTRIM=62.5K

Therefore Rtrim standard 1% value down from 62.

U1

R8 10K

START

C1 1uF

READY

FAULT#

R2 10K

R1 10K

D1

3

5

11

START

READY

FAULT#

TRIM_CAP

TRIM

VM

18

20

14

19

COMP1 12

COMP2

1

28

6

SCL

SDA

SMM105

FILT_CAP 10

4

2

A0

A1

A2

WP# 8

R3 RTRIM

C5

0.02uF

U2 Switching Regulator

+Vin

+Vout

PGOOD

VADJ (VREF)

VOUT

R4

RSET1

R5

20k

DIODE

J1

START

1

3

5

7

Gnd

Gnd3

Rsrv5

SCL

SDA

MR

2

4

6

8

9

+10V Rsrv8

+5V Rsrv10

10

The SMM105 START pin must be inactive during power-up so

SMX3200 I2C Programming

Connector 10 pin Header

R1 and R2 need only be

that the TRIM pin is high impedence. Once power is nominal,

the START pin can be active to start margin and ADOC

functions

placed once on the I2C bus

Figure 7 – SMM105 Applications schematic for an adjustable switching regulator (Full regulator circuit not

shown).

Summit Microelectronics, Inc

2068 1.8 09/20/05

11

Share Link: