ETA6096

www.etasolution.com

6

Empowering Thinkers

ADJUSTING CHARGE CURRENT by PWM VOLTAGE

1

8

5

2

3

10

7

6

VIN

ISET

AGND

AGND

PMID

SW

BATS

PGND

ETA6096

Riset

VIN

+

-

22uF

2.2uH

10uF

Li+ Battery

1uF

Optional, to real-time

adjust charge current

Vpwm

R1

9

STAT

1K

As given by above application circuit, one can real-time adjust the charge current by a PWM signal with different duty-

cycle. The Vpwm is the RC filtered voltage of the PWM signal, and it will change linearly with the duty-cycle of the PWM

signal. Followings are 2 examples of charge current’s relationship to Vpwm. Please contact ETA engineers if one wants

to have specific real-time charge current setting, the choosing of R1 and Rset value will be provided quickly.

Charge Current Vs. Vpwm at R1=200K, Rset=160K

Charge Current Vs. Vpwm at R1=220K, Rset=130K

0

0.5

1

1.5

2

2.5

0

0.5

1

1.5

2

Vpwm(V)

0

0.5

1

1.5

2

2.5

0

0.5

1

1.5

2

Vpwm(V)