AAT1160 AAT, AAT1160 Datasheet - Page 11

• Manufacturer Part Number: AAT1160
• Description: Step Up Current Mode PWM Converter
• Manufacturer: AAT

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0.04*1.25V, or 50mV. Error amplifier output
drives 50mV*105µs, or 6.25µA, across
provide transient gain. Since the current-sense
transresistance is 0.275V/A, the value of
would allow the required load-step swing is as
follows:
BLOCK DIAGRAM
R =0.275I
CIN+
GND
EO
IN1
FREQ
C
GI1
1.0v
5u
IND(PK)
Bandgap &
soft start
oscillator
Advanced Analog Technology, Inc.
Com
Gamma1
/6.25µA
–
V
–
DD1
Advanced Analog Technology, Inc
1.24v
Clock
台灣類比科技股份有限公司
GI2
Error amplifier
Slope compensation ∑ current sense
R
R
Gamma2
C
C
to
that
GI3
Page 11 of 14
Comparator
In a step-up DC-to-DC converter, if L
output current would relate to inductor current as:
Therefore, for a 500mA output load step with
V =2.5V and
R =[1.25(0.75*0.5*5)/2)]/6.25µA=18.7kΩ
IN
C
I
IND(PK)
Gamma3
1.0v
=1.25I
Thermal SHDN
Fault Detect
SHDN
Control
Logic
GI4
OUT
V =5V:
O
/(1-D)=1.25I
–
.
Gamma4
–
Driver
OUT
AAT1160
*
V /
IDEAL
V 1.0
O
V
SHDN
SW
GND1
GO3
GO4
V
COUT
GO1
GO2
DD1
DD
V
IN
is used,