AT1731 [ETC]
2-Channel PWM Controller for LCD Bias; 2通道PWM控制器，用于LCD偏置
| 型号： | AT1731 |
| 厂家： | 
ETC |
| 描述： | 2-Channel PWM Controller for LCD Bias |
| 文件： | 总8页 (文件大小：248K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AT1731
Preliminary
2-Channel PWM Controller for LCD Bias
Features
General Description
• Low input voltage: 2.5V to 7V
• 2-Channels PWM Control:
1 Boost Controller(CH1)
The AT1731 is a PWM DC/DC converter control
IC with 2 channel outputs that can directly drive
power MOSFET. This IC ia suitable for very small
DC/DC converters because of their small and thin
package(1.1 mm max.), and high operation
frequency (up to 1.0 MHz).
1 Inverting Controller (CH2)
• Adjustable Soft start time and maximum duty
cycle
• Built-in timer latch for short circuit protection:
16
Delay time=2 /(Switching frequency)
• Built-in under-voltage lockout, thermal
shutdown.
• High operating frequency: 100kHz to 1MHz
Applications
• LCD Displays Bias
• Power Supply for general equipment
Block Diagram
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
1
AT1731
Preliminary
2-Channel PWM Controller for LCD Bias
Pin Configuration
Ordering Information
Part number
AT1731
Package
Marking
AT1731P
-
TSSOP16
Pin Description
Symbol Pin No.
Descript
Symbol
Pin No.
Descript
FB1
IN1
NC
1
2
3
CH1 error amplifier output OUT1
9
CH1 output for Nch-
MOSFET
CH1 inverting input to OUT2
10
11
CH2 output for Pch-
MOSFET
error amplifier
Don’t connect
NC
Don’t connect
GND
PGND
GND
4
5
6
Control blocks ground
Power blocks ground
Control blocks ground
VCC
REG
CT
12
13
14
Power Supply
Regulated voltage output
Oscillator
timing
capacitor
IN2
7
8
CH2 inverting input to CS2
15
16
Sotf-start for CH2
error amplifier
FB2
CH2 error amplifier output
CS1
Soft-star for CH1
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
2
AT1731
Preliminary
2-Channel PWM Controller for LCD Bias
Absolute Maximum Ratings
Parameter
Condition
Rated Value
Unit
Min.
Max.
Power Supply Voltage
Source Average Current of OUT1
OUT2
—
—
-
+8
V
-
-50
mA
Sink Average Current of OUT1
OUT2
—
—
-
50
mA
Input Voltage to Error Amplifier
Continuous power dissipation
Operating temperature
Junction temperature
Storage temperature
Lead temperature
-
-
6.5
500
+85
+125
+150
+300
V
mW
TSSOP16（T =+25℃）
a
—
—
—
—
-30
0C
0C
0C
0C
-
-40
-
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
Recommended Operating Conditions
(Ta=+250C)
Parameter
Symbol
Values
Typ.
Unit
Min.
Max.
Power supply voltage
Oscillation frequency
Operating temperature
VCC
fOSC
TOP
2.5
100
-30
--
7
Ｖ
KHz
°C
500
1000
+25
+85
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
3
AT1731
Preliminary
2-Channel PWM Controller for LCD Bias
Electrical Characteristics
(VCC = 3V,T =+25℃, unless otherwise noted.)
a
Parameter
Symbol
Condition
Values
Unit
Min. Typ. Max.
Input Supply Range
2.5
--
7.0
V
V
VCC
VCC
Undervoltage
UVLO
1.95 2.05 2.15
0.98 1.00 1.02
Lockout
Reference Voltage
VREF
V
mV
%
VCC=2.5V to 7.0V
Reference Voltage
line-regulation
Entire device
VREF-Line
1
5
T =-30℃ to +85℃
a
Rference Variation
with Temperature
0.5 1.5
Duty=50%,
Operating Current
ICC
f
=500KHz
OSC
3.0 3.8 mA
10 mV
Input Offset Voltage
Source Current
VIO
IOH
IOL
VFB = VREG -0.5V
VFB = 0.5V
T =-30℃ to +85℃
a
μA
-160 -120 -80
2.0 2.5 3.0 mA
(CH1,2)
Sink Current(CH1,2)
Source current Variation
with temperature
20
%
Error amplifier
Sink current Variation
with temperature
T =-30℃ to +85℃
a
20
%
MHz
V
Unity Gain Bandwidth
Common Mode Input
Voltage Range
fT
2.0
80
VCOM
0.2
1.5
DC Open Loop Gain
Frequency
AV
fosc
dB
kHz
V
CT =150pF
480 550 620
CT =150pF
1.0
0.5
2
High Level Voltage
CT =150pF
Sawtooth wave
Low Level Voltage
V
Oscillator (OSC)
Variation with Power
Supply
Vcc=2.5V to 7V
%
Variation with
T =-30℃ to +85℃
a
7
2.16 2.20 2.24
1.5
%
V
Temperature
CO =0.1μF
Vcc=2.5V to 7V
Regulated Voltage
Variation with Power
Supply
VREG
%
Regulated Voltage
for internal Control
Block
Variation with
T =-30℃ to +85℃
a
1.5
%
Temperature
mA
Source Current
IREG
-40
-
-15
Soft-Start and Duty Charge Current of
Section CS1(Source)
ICS1_2
-1.0
mA
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
4
AT1731
Preliminary
2-Channel PWM Controller for LCD Bias
Charge Current of
CS2(Sink)
Max. Duty of CH1
ICS3
1.0
mA
f
f
=500KHz
OSC
=500KHz
OSC
80
80
87
86
90
90
%
%
Max. Duty of CH2
Invalid TL threshold
voltage of CS1
0.3
1.32.
1.32
0.3
V
V
V
V
Invalid TL threshold
voltage of CS2
Threshold Voltage of
VTLTH1
VTLTH2
FB1
Timer Latch Section
(TL)
Threshold Voltage of
FB2
16
2
Start up count
Start up time
Count
TTL
105 119 137 ms
Thermal Shuntdown
Section
Threshold Temperature
Rise time of OUT1
Rise time of OUT3
Fall time of OUT1
Fall time of OUT2
TOH
tr1
140
25
25
25
25
0C
ns
ns
ns
ns
Ω
CO =1000pF between
OUT1-GND
20
20
20
20
35
35
35
35
Output Section
CO =1000pF between
VCC-OUT2
Tr2
CO =1000pF between
OUT1-GND
tf1
CO =1000pF between
VCC-OUT2
tf2
High Level on
IOUT1=-150mA
R1AH
R1AL
R2AH
R2AL
2.5 4.0 5.5
2.5 4.0 5.5
2.5 4.0 5.5
2.5 4.0 5.5
Resistance of OUT1
Low Level on
IOUT1=150mA
IOUT2=-150mA
IOUT2=150mA
Ω
Resistance of OUT1
High Level on
Ω
Resistance of OUT2
Low Level on
Ω
Resistance of OUT2
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
5
AT1731
Preliminary
2-Channel PWM Controller for LCD Bias
Typical Application Circuit
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
6
AT1731
Preliminary
2-Channel PWM Controller for LCD Bias
Package Outline 16-pin TSSOP
MILLIMETERS
INCHES
TYP
SYMBOL
MIN
TYP
MAX
MIN
MAX
A
A1
A2
b
1.05
0.05
-
1.10
0.10
1.00
0.25
0.127
5.075
6.40
4.40
0.60
0.65
-
1.20
0.15
1.05
0.28
-
0.041
0.002
-
0.043
0.004
0.039
0.010
0.005
0.1998
0.252
0.173
0.024
0.026
-
0.047
0.006
0.041
0.011
-
0.20
-
0.008
-
C
D
E
4.90
6.20
4.30
0.50
-
5.10
6.60
4.50
0.70
-
0.193
0.244
0.170
0.020
-
0.200
0.260
0.177
0.028
-
E1
L
e
y
-
0°
0.076
8°
-
0°
0.003
8°
θ
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
7
AT1731
Preliminary
2-Channel PWM Controller for LCD Bias
Reflow Condition (IR/Convection or VPR Reflow)
Reference JEDEC Standard J-STD-020A
Classification Reflow Profiles
Convection or
IR/Convction
VPR
Average Heating Rate(180°C to peak)
Preheat Temperature(125±20°C)
Temperature maintained above 180°C
Time within 5°C of actual Peak
Temperature
5°C/second max.
120 seconds max.
10~150 seconds
10~20 seconds
10°C/second max.
60 seconds
Peak Temperature Range(Note 1)
219~225°C or
235~240°C
6°C /second max.
6 minutes max.
219~225°C or
235~240°C
10°C/second max.
Cooling Rate
Time 25°C to Peak Temperature
*1 The maximum peak temperatures for IR and VP reflow are depending on package dimensions.
Package Reflow Conditions
Pkg. Thickness <2.5mm Pkg. Thickness <2.5mm
Pkg. Thickness ≥2.5mm
and
and
and all bags
3
3
Pkg. Volume ≥350 mm
Pkg. Volume <350 mm
Convection 219~225°C
VPR 219~225°C
IR/Convection 219~225°C
Convection 235~240°C
VPR 235~240°C
IR/Convection 235~240°C
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
8
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