CS8191XDWF20 View Datasheet(PDF) - ON Semiconductor

Part Name

Description

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CS8191XDWF20

Precision Air-Core Tach/Speedo Driver with Short Circuit Protection

ON Semiconductor 

CS8191

Ripple voltage on the F/V output causes pointer or needle

flutter especially at low input frequencies.

The response time of the F/V is determined by the time

constant formed by RT and C4. Increasing the value of C4

VREG

R3

VC(t)

+

–

FREQIN

SQOUT

CCP

R4

+

QSQUARE

–

will reduce the ripple on the F/V output but will also increase

the response time. An increase in response time causes a

very slow meter movement and may be unacceptable for

many applications.

0.25 V

2.0 V

+

F/VOUT

CP–

Q3

–

RT

F to V

CP+

C4

Q1

Q2

2.7 V

Figure 7. Partial Schematic of Input and Charge Pump

VCC

tDCHG

T

tCHG

FREQIN 0

SQOUT

VREG

0

ICP+

VCP+

0

Figure 8. Timing Diagram of FREQIN and ICP

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