Rainbow-electronics MAX8724 Manuel d'utilisateur télécharger pdf (Page 23)

the charge-current amplifier transconductance = 1µA/mV.

is the DC-DC converter transconductance =

3.3A/V. The CCS loop is a single-pole system with a dom-

inant pole compensation set by f

P_CS

The loop transfer function is given by:

Since:

Then, the loop transfer function simplifies to:

The crossover frequency is given by:

The CCS loop dominant compensation pole:

where the GMS amplifier output impedance, R

OGMS

10MΩ.

To calculate the CCI loop compensation pole, C

GMS = 1µA/mV

= 3.33A/V

OGMS

= 10MΩ

f = 400kHz

PCS

OGMS CS

2π

GMS

CO CS

2π

LTF GMS

sR C

OGMS

OGMS CS

=×

+×1

ARS

CSS

LTF GM A RS GMS

sR C

IN CSS

OGMS

OGMS CS

=××××

+×

PCS

OGMS CS

2π

MAX1908/MAX8724

Low-Cost Multichemistry Battery Chargers

______________________________________________________________________________________ 23

CCS

GMS

CLS

OGMS

CSSP CSSN

CSS

RS1

Figure 9. CCS Loop Diagram

CCS LOOP GAIN

vs. FREQUENCY

FREQUENCY (Hz)

GAIN (dB)

100k10k110100 1k

-40

-20

100

-60

0.1 1M

CCS LOOP PHASE

vs. FREQUENCY

FREQUENCY (Hz)

PHASE (DEGREES)

100k10k1k100101

-90

-75

-60

-45

-30

-15

-105

0.1 1M

Figure 10. CCS Loop Gain/Phase vs. Frequency

1 2 ... 18 19 20 21 22 23 24 25 26 27

MAX1908/MAX8724 1
Package Information 27

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Rainbow-electronics MAX8724 Manuel d'utilisateur Page 23

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