AAT1102 Ver la hoja de datos (PDF) - Advanced Analog Technology, Inc.

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AAT1102

ADVANCED PWM DC-DC CONVERTER WITH INTERNAL SWITCH AND SOFT-START

Advanced Analog Technology, Inc. 

Advanced Analog Technology, Inc.

Rc

= Vo

VFB

2πf ci CRcs

kg m

(RL + 2rc )

⎢⎣⎡(1 −

D)RL

−

r⎤

(1 − D)⎥⎦

VFB is equal to reference voltage,VREF .

VREF =1.24V, k is the correct factor, and

k = (6 − 8)

AAT1102 (BIN2)

5. The output filter capacitor is chosen so C .

RL pole cancels Rc . Cc zero

Rc C c

=

(1

C

−

3)

⎜⎛

⎝

RL

2

+

rc

⎟⎞

⎠

,

and

Cc

=

C

(1 − 3)Rc

⎜⎛ RL

⎝2

+

rc

⎟⎞

⎠

Example:

VIN =5V, VO =9.6V, IO =250mA, f s =600 kHz,

VFB =1.25V, L = 6.8uH , gm = 105uS , Rcs = 0.275

V/A,

rL

= 0.1Ω , rDS

= 0.23Ω , r

C

= 50mΩ ,

k =7

RF = 1.4Ω , fci = 21.4 kHz, Cc =1.3nF, Rc = 27k

Ω, C =4.7uF

Fig.5. Bode diagram using Matlab simulation

Fig.4. CH1: PWM waveform, CH2, v p− p

for Vo

– 台灣類比科技股份有限公司 –

– Advanced Analog Technology, Inc. –

Page 12 of 18

V5.0

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