AAT1160 [AAT]
Step Up Current Mode PWM Converter with 4+1 Operational Amplifiers; 加强电流模式PWM转换器，具有4 + 1运算放大器
| 型号： | AAT1160 |
| 厂家： | 
ADVANCED ANALOG TECHNOLOGY, INC. |
| 描述： | Step Up Current Mode PWM Converter with 4+1 Operational Amplifiers |
| 文件： | 总14页 (文件大小：359K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Advanced Analog Technology, Inc.
Product information presented is current as of publication date. Details are subject to change without notice.
Step Up Current Mode PWM Converter with
4+1 Operational Amplifiers
Features
General Description
z Built in 1.6A, 0.23ΩSwitching NMOS
z Fault and Thermal Protection
z Internal Soft-Start Function
The AAT1160 is a step up current mode PWM
converter that provides a one-channel step-up PWM
controller, four Gamma buffers, and one VCOM
buffer. Internal soft-start function can efficiently
prevent inrush current when the power is on.
This PWM controller consists of an on-chip voltage
reference, error amplifier, current sense, pulse width
modulation controller, under-voltage lockout
protection, thermal detect, soft-start, and fault
protection circuits.
z Selectable Frequency：600 kHz or 1.25MHz
z Low Dissipation Current :
Typical 1.6mA in Operation
z Four Channels VGAMMA with Output Current:
+30mA (MAX)
z One channel VCOM with Output Current:
+100mA (MAX)
z TSSOP-20 Package Available
The AAT1160 contains 4+1 operational amplifiers:
GO1, GO2, GO3, and GO4 for gamma corrections
Pin Configuration
(Top View)
and COUT forVCOM
.
1
2
SW
VDD
GND1
GND
IN1
20
19
18
17
16
15
14
13
12
11
VCOM and VGAMMA are designed to increase
driving capability for thin film transistor liquid
crystal display (TFT LCD). Each buffer is capable
of driving heavy load and offering fast current
loading (VCOM : ±100mA , and VGAMMA : ± 30mA ).
With minimal external components, the AAT1160
offers a simple and economical power management
solution for TFT LCD panels.
3
SHDN
FREQ
VDD1
4
EO
5
N.C
AAT1160
6
CIN+
GI1
COUT
GO1
GO2
GO3
GO4
7
8
GI2
9
GI3
10
GI4
TSSOP-20 PACKAGE
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 1 of 14
V 1.0
Advanced Analog Technology, Inc.
Pin Description
PIN
NO.
NAME I/O
DESCRIPTION
1
2
3
4
5
6
7
8
9
SW
VDD
O High Voltage Switch Output
-
I
I
-
I
Power Supply
Shutdown Control Pin; High for Enable
Frequency Select Pin
High Voltage Power Supply
VCOM Buffer Input
Gamma Buffer 1 Input
Gamma Buffer 2 Input
Gamma Buffer 3 Input
Gamma Buffer 4 Input
SHDN
FREQ
VDD1
CIN+
GI1
GI2
GI3
GI4
I
I
I
I
10
GO4
GO3
GO2
GO1
COUT
O Gamma Buffer 4 Output
O Gamma Buffer 3 Output
O Gamma Buffer 2 Output
O Gamma Buffer 1 Output
11
12
13
14
15
16
17
18
19
20
O
VCOM Buffer Output
N.C
EO
IN1
-
O PWM Error Amplifier Output Pin
I
-
Inverting Input Pin of PWM Error Amplifier
Ground
GND
GND1
-
Ground
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 2 of 14
V 1.0
Advanced Analog Technology, Inc.
Absolute Maximum Ratings
PARAMETER
SYMBOL
VALUE
UNIT
VDD to GND
VDD
7
V
VSW
18
V
SW to GND
VDD1 to GND
VDD1
VI1
14
VDD +0.3
V
V
Input Voltage 1 (IN1, SHDN, FREQ)
Input Voltage 2 (CIN+, CI1, CI2, GI3, GI4)
V
V
V
VI2
VO1
VO2
VDD1 +0.3
VDD +0.3
VDD1 +0.3
Output Voltage 1 (EO)
Output Voltage 2 (COUT, GO1, GO2, GO3,
GO4, SW)
ο
TC
Operating Free-Air Temperature Range
Storage Temperature Range
Power Dissipation
− 20 to + 85
− 45to +125
700
C
ο
C
TDD1
Pd
mW
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 3 of 14
V 1.0
Advanced Analog Technology, Inc.
Electrical Characteristics, VDD= 3V, FREQ=GND, VDD1= 10V
Operating Power
PARAMETER
SYMBOL TEST CONDITION
MIN TYP MAX UNIT
VDD
Input Supply Voltage Range
2.6
5.5
V
V
V
Falling
Rising
2.29 2.43 2.57
2.58
VUVLO
VDD Under Voltage Lockout
VIN1=1.3V, not switching
VIN1=1.1V, switching
VSHDN =GND
0.36 0.60
mA
mA
µA
IVDD
Quiescent Current
1.2
0.1
5.0
10.0
ISHDN
TSHDN
Shutdown Current
Thermal Shutdown
ο
160
C
EA (Error Amplifier)
PARAMETER
SYMBOL TEST CONDITION
Leveltoproduce
MIN TYP MAX UNIT
VIN1
Feedback Voltage
Input Bias Current
1.247 1.265 1.283
40
V
V
EO=1.265V
VIN1=1.265V
Leveltoproduce
I B1
VRI
0
nA
Feedback-Voltage Line
Regulation
V
EO=1.265V
0.05 0.15 % /V
2.6V <VDD <5.5V
ΔI=5µA
gm
Transconductance
70
105
240 µA /V
V /V
AV
Voltage Gain
1,500
Fault Detect Trigger Voltage
0.98 1.02 1.06
V
Oscillator
PARAMETER
SYMBOL TEST CONDITION
MIN TYP MAX UNIT
FREQ=GND
fOSC
500
600
700
kHz
kHz
%
Oscillation Frequency
Maximum Duty Cycle
FREQ= VDD
FREQ=GND
900 1250 1500
79
85
85
92
DMAX
FREQ= VDD
%
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 4 of 14
V 1.0
Advanced Analog Technology, Inc.
Electrical Characteristics, VDD= 3V, FREQ=GND, VDD1= 10V
N-CHANNEL SWITCH
PARAMETER
SYMBOL
TEST CONDITION
VIN1=1.1V,
ISW =1.2A
VSW =12V
MIN TYP MAX UNIT
ILIM
RON
ISWOFF
Current Limit
On-Resistance
Leakage Current
1.1
1.6
2.1
A
Ω
0.28 0.50
0.01 20.00
µA
Soft Start & Fault Detect Time
PARAMETER
SYMBOL
TEST CONDITION
MIN TYP MAX UNIT
tSS
Soft Start Time
14
ms
During Fault Protect Trigger
Time
tFS
55
ms
Control Inputs Characteristics
PARAMETER
SYMBOL
TEST CONDITION
MIN
TYP MAX UNIT
0.3
VDD
VIL
VIH
Input Low Voltage
V
0.7
VDD
Input High Voltage
Hysteresis
V
0.1
VDD
VHYS
V
IPL
IPH
FREQ Pull Down Current
SHDN Pull Up Current
3.5
5.0
6.5
µA
µA
0.001 1.000
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 5 of 14
V 1.0
Advanced Analog Technology, Inc.
Electrical Characteristics, VDD= 3V, FREQ=GND, VDD1= 10V
VCOM and Gamma Buffer Performance
PARAMETER
SYMBOL
TEST CONDITION
MIN TYP MAX UNIT
VDD1 from 6.5V to
13.5V
Power Supply Rejection
Ratio
PSRR
IVDD
-
-
80
-
-
dB
Supply Current
1.5
mA
VCOM and Gamma Buffer Input Characteristics
PARAMETER
SYMBOL
TEST CONDITION
MIN TYP MAX UNIT
VOS
VCIN+ or VGI1~4 =5V
Input Offset Voltage
-
-
2
2
12
50
mV
nA
VCIN+ or VGI1~4 =5V
IB2
Input Bias Current
VCOM and Gamma Buffer AC Characteristics
PARAMETER
SYMBOL
TEST CONDITION
MIN TYP MAX UNIT
VCIN+ or VGI1~4
=
V µs
µs
Slew Rate [Note 1]
SR
-
-
12
5
-
-
2V to 8V, 20% to
80%
VCIN+ or VGI1~4
=
4.5V to 5.5V 0.1%
tS
Settling Time
VCIN+ or VGI1~4
=
5.5V to 4.5V 0.1%
Note 1: Slew rate is measured on rising and falling edges.
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 6 of 14
V 1.0
Advanced Analog Technology, Inc.
Electrical Characteristics, VDD= 3V, FREQ=GND, VDD1= 10V
VCOM and Gamma Buffer Output Characteristics
PARAMETER
SYMBOL
TEST CONDITIONS
ICOUT =5mA (VCOM Buffer)
VCIN+ =0V
IGO1~4 =10mA (Gamma Buffer)
VGI1~4 =1V
ICOUT =− 5mA (VCOM Buffer)
VCIN+ =10V
IGO1~4 =−10 mA (Gamma
MIN TYP MAX UNIT
-
-
0.08
0.15
VOL2
Output Swing Low
V
V
1.02 1.05
9.85 9.92
8.95 8.98
-
-
VOH2
Output Swing High
Buffer)
VGI1~4 =9V
VOL3
VOH3
IGO1~4 =10mA, VGI1~4 =5V
-
5.02 5.04
4.96 4.98
5.03 5.05
Output Swing
V
V
(Gamma Buffer)
IGO1~4 =−10 mA, VGI1~4 =5V
-
VOL3
VOH3
ICOUT =50mA, VCIN+ =5V
-
Output Swing (VCOM
Short Circuit Current
)
ICOUT =− 50mA, VCIN+ =5V
4.95 4.97
-
-
± 70
(Gamma Buffer)
(VCOM Buffer)
-
-
mA
mA
ISHORT
±180
-
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 7 of 14
V 1.0
Advanced Analog Technology, Inc.
Efficiency vs. Load Current
(fOSC =1.2MHz VOUT =8.1V)
Efficiency vs. Load Current
(fOSC =600kHz VOUT =8.1V)
L:10µH
L:10µH
Efficiency V.S. Load Current
(VOUT:8.1V,Freqency:1.2MHz)
Efficiency V.S. Load Current
(VOUT:8.1V,Freqency:1.2MHz)
90
80
70
60
50
90
80
70
60
50
40
1
40
1
5
10
20
30
40
50
60
70
80
90 100 120 150 180 200 300 400 500
5
10
20
30
40
50
60
70
80
90 100 120 150 180 200 300 400 500
Load Current (mA)
Load Current (mA)
Efficiency vs. Load Current
(fOSC =1.2MHz VOUT =8.1V)
Efficiency vs. Load Current
(fOSC =600kHz VOUT =8.1V)
L:4.7µH
L:4.7µH
Efficiency V.S. Load Current
(VOUT:8.1V,Freqency:1.2MHz)
Efficiency V.S. Load Current
(VOUT:8.1V,Freqency:600KHz)
90
80
70
60
50
90
80
70
60
50
40
40
1
5
10
20
30
40
50
60
70
80
90 100 120 150 180 200 300 400 500
1
5
10
20
30
40
50
60
70
80
90 100 120 150 180 200 300 400 500
Load Current(mA)
Load Current(mA)
Load Regulation
Internal Soft Start
Output Voltage V.S. Load Current
Load Regulation
8.3
8.25
8.2
8.15
8.1
8.05
8
1
5
10
20
30
40
50
60
70
80
90 100 120 150 180 200 300 400 500
Load Current (mA)
T = 2ms/div
CH1:
IN , 2V/div, DC
V
CH2: L , 500mA/div, DC
I
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 8 of 14
V 1.0
Advanced Analog Technology, Inc.
Load Transient Response
Load Transient Response
T = 100s/div
T = 100s/div
O = 8.1V,
V
= 3.3V, fOSC =1.2MHz
= 8.1V,
= 3.3V, fOSC =600kHz
VIN
VIN
VO
CH1: Load, 100mA to 250mA
CH1: Load, 100mA to 250mA
CH2: O , 200mV/div, AC
CH2:
O , 20
V
V
VGAMMA Signal Response
VCOM Signal Response
INPUT
INPUT
No Cout
100pF
No Cout
100pF
1000pF
10nF
1000pF
10nF
5v/div
5v/div
100nF
100nF
10μs/div
10μs/div
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 9 of 14
V 1.0
Advanced Analog Technology, Inc.
Operation Information:
Setting the Output Voltage:
The Compensation:
Pin17 (EO) series with RC & CC for
compensation, usually range as 1kΩ≤ RC ≤200k
Ω, 100pF≤ CC ≤6,800pF. Standard formulas are
Output voltage is set by using a feedback pin and a
resistor divider; equation is as follows:
VP1 =1.265 (1+R1/R2)
only for reference purpose, as PCB has a lot of
noise or parasitic capacitance and resistance, it
often requires on board adjustment.
Soft-Start:
The soft-start function is embedded with a typical
setting of 14ms
The key steps for step-up compensation are as
follows:
Transconductance (from FB to CC), gm (105µS)
Current-sense amplifier transresistance, RCS
Operation Frequency Setting:
Pin4 (FREQ) can set PWM operation to low with
fOSC =600kHz, or set PWM operation to high with
fOSC =1.2 MHz.
(0.275V/A)
For continuous conduction, the right-half-plane
zero frequency (fRHPZ ) is given by the following:
fRHPZ =VO (1-D)2/(2π*L*ILOAD ) where D=the
Diode Selection:
duty cycle=1-(VIN / VO ), L is the inductance value,
and ILOAD is the maximum output current. Typical
target, crossover (fC ), is 1/6 of the RHPZ.
Schottky diode for the boost regulator must be
selected correctly depending on the output voltage
and the output current. The diode must have a
reverse voltage equal to or greater than the output
voltage. In addition, the diode current must
exceed the switch current limit as a lower forward
voltage will increase efficiency.
For example, if oscillation frequency is assumed to
be fOSC =500kHz, VIN =2.5V, VO =5V, and
IOUT =0.5A, then R LOAD =10Ω. If we select
L=4.7µH, then:
fRHPZ =5(2.5/5)2/(2π*4.7*10-6*0.5)=84.65kHz
If fC =14kHz, CC would be calculated as:
Inductor Selection:
IL(peak) =IIN +VIN *D/(2*L*fS )
CC =(VFB / VO )(R LOAD / RCS )(gm /2π*fC )(1-D)/2=(
1.25/5)(10/0.275)*[105µS/(6.28*14kHz)](1/4)=2.7
D: PWM duty
VO / VIN =1/ (1-D)
nF
Now selected RC has fulfilled transient-droop
Maximum current of the inductor must be greater
than IL(peak)
requirements. For example, if 4% of transient
droop is allowed, input to error amplifier moves
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 10 of 14
V 1.0
Advanced Analog Technology, Inc.
0.04*1.25V, or 50mV. Error amplifier output
In a step-up DC-to-DC converter, if LIDEAL is used,
drives 50mV*105µs, or 6.25µA, across RC to
output current would relate to inductor current as:
IIND(PK)=1.25IOUT/(1-D)=1.25IOUT*VO / VIN
provide transient gain. Since the current-sense
transresistance is 0.275V/A, the value of RC that
Therefore, for a 500mA output load step with
VIN =2.5V and VO =5V:
RC =[1.25(0.75*0.5*5)/2)]/6.25µA=18.7kΩ
would allow the required load-step swing is as
follows:
RC =0.275IIND(PK)/6.25µA
BLOCK DIAGRAM
VDD
EO
SHDN
Thermal SHDN
Fault Detect
SHDN
1.0v
Error amplifier
SW
IN1
Comparator
Bandgap &
soft start
Control
Logic
1.24v
1.0v
Driver
GND1
VDD1
FREQ
CIN+
oscillator
Slope compensation ∑ current sense
Clock
5u
COUT
GO1
Com
GO2
GO3
GND
Gamma2
VDD1
Gamma1
Gamma3
GO4
Gamma4
GI2
GI3
GI4
GI1
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 11 of 14
V 1.0
Advanced Analog Technology, Inc.
Application Circuit
VP1
VDD
SHDN
FREQ
IN1
R1
R2
VP1
SW
EO
RC
CC
VDD1
AAT1160
VP1
CIN
GI1
GI2
COUT
GO1
GO2
GO3
GO4
GI3
GI4
GND1 GND
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 12 of 14
V 1.0
Advanced Analog Technology, Inc.
Package Dimension
20-Pin TSSOP
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 13 of 14
V 1.0
Advanced Analog Technology, Inc.
Package Dimension (Cont.)
20-Pin TSSOP
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 14 of 14
V 1.0
相关型号：
©2020 ICPDF网 联系我们和版权申明