ETC AT1743P

AT1743
2-Channel PWM Controller for LCD Display
Features
General Description
• High-accuracy reference voltage circuit (±1%).
• Built-in short-circuit protection circuit.
• Built-in Undervoltage Lockout protection.
• Internal 2.5V Reference supply.
• Variable Dead time provides control over total
Range.
The AT1743 is 2-channel PWM switching
regulator controllers that contains an on-chip 2.5V
reference, two error amplifier, an adjustable
oscillator, two dead-time comparators, undervoltage lockout circuitry and 2 common-emitter
output. It is idea for step-up, step-down, and
inverting converter.
Applications
• LCD Display
• Portable equipment
Block Diagram
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
1
AT1743
2-Channel PWM Controller for LCD Display
Pin Configuration
Ordering Information
Part number
AT1743
-
Package
TSSOP16
-
Marking
AT1743P
-
Pin Description
Pin No.
Symbol
I/O
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
CT
RT
NON1
INV1
FB1
DT1
OUT1
GND
Vcc
OUT2
DT2
FB2
INV2
NON2
SCP
Vref
--I
I
O
I
O
--O
I
O
I
I
-O
Description
External timing capacitor
External timing resistor
Positive input for error amplifier 1
Negative input for error amplifier 1
Error amplifier 1 output
Output 1 dead time / soft start setting
Output 1
Ground
Power supply
Output 2
Output 2 dead time / soft start setting
Error amplifier 2 output
Negative input for error amplifier 2
Positive input for error amplifier 2
Time latch setting
Reference voltage output(2.5V)
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
2
AT1743
2-Channel PWM Controller for LCD Display
Absolute Maximum Ratings
(Ta=+250C)
Parameter
Power supply voltage
Power dissipation
Operating temperture
Storage temperture
Output current
Output voltage
Symbol
Limits
Vcc
Pd
Topr
Tstg
Io
Vo
30
450*1
-30~+85
-55~+125
120*2
30
Unit
V
mW
℃
℃
mA
V
*1 When mounted on 70mm×70mm×1.6mm glass epoxy board. Reduced by 6.5mw for each increase in Ta of 1℃ over 25℃.
*2 Should not exceed Pd and values.
Recommended Operating Conditions
(Ta=+250C)
Parameter
Power supply voltage
Output current
Output voltage
Error amplifier input voltage
Timing capacitor
Timing resistor
Oscillator frequency
Symbol
VCC
Io
Vo
VOM
CCT
RRT
FOSC
Values
Min.
3.6
--0.3
100
5.1
10
Typ.
6.0
-------
Unit
Max.
25
100
25
1.6
15000
50
800
V
mA
V
V
pF
kΩ
kHz
Timing chart
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
3
AT1743
2-Channel PWM Controller for LCD Display
Electrical Characteristics
Parameter
Reference voltage
block
Triangular wave
oscillator
Protection circuit
Rest period
adjustment circuit
Low-voltage input
miss-operation
prevention circuit
Error amplifier
PWM comparator
Output block
Total device
(unless otherwise noted, Ta=25℃, and Vcc=6V )
Symbol
Condition
Values
Unit
Output voltage
Input stability
Load stability
Oscillation frequency
Frequency deviation
Threshold voltage
Standby voltage
Latch voltage
Source current
Comparator threshold
voltage
Input threshold voltage
(fosc=10kHz)
Vref
VDL1
VDLO
Fosc
FDV
VIT
VSTB
VLT
ISCP
Min. Typ.
Iref=1mA
2.48 2.5
Vcc=3.6~25V
-1
Iref=0~5mA
-1
RRT=10kΩ, CCT=220pF 320 400
Vcc=3.6~25V
-1
-1.48 1.64
No pull up
-50
No pull up
-30
-1.5 2.5
VCT
Pin 5, Pin 12
0.9
1.2
V
Vt0
Vt100
1.79 1.97 2.15
1.32 1.48 1.64
V
V
On duty cycle
DON
Input bias current
Latch mode source
current
Latch input voltage
IBDT
Duty cycle=0%
Duty cycle=100%
Divide Vref using 13
kΩ and 27 kΩ
DT1, DT2=2.0V
IDT
VDT
Threshold voltage
VUT
--
--
Input offset voltage
Input offset current
Input bias current
Open circuit gain
Common-mode input
voltage range
Common-mode
rejection ratio
Maximum output
voltage
Minimum input voltage
Output sink current
Output source current
Input threshold voltage
(fosc=10kHz)
Saturation voltage
Leak current
Standby current
Average current
consumption
VIO
IIO
IIB
AV
-----
VOM
1.05
Max.
2.53 V
10 mV
10 mV
480 kHz
-%
1.80 V
100 mV
100 mV
3.5 μA
45
55
65
%
--
0.1
1
μA
DT1, DT2=0V
200
560
--
μA
IDT=40μA
2.28 2.48
--
V
2.53
--
V
---70
--15
85
6
30
100
--
mV
nA
nA
dB
0.3
--
1.6
V
Vcc=3.6~25V
CMRR
--
60
80
--
dB
VOH
--
2.3
2.5
--
V
VOL
IOI
IOO
Vt0
Vt100
VSAT
IREAK
ICCS
-FB=1.25V
FB=1.25V
Duty cycle=0%
Duty cycle=100%
Io=75mA
Vo=25V
When output is off
ICCA
RRT=10 kΩ
-0.7 0.9
V
3
20
-mA
45
75
-- μA
1.79 1.97 2.15 V
1.32 1.48 1.64 V
-0.8 1.2
V
μA
-0
5
-1.3 1.8 mA
--
1.6
2.3
mA
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
4
AT1743
2-Channel PWM Controller for LCD Display
Timing Curve
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
5
AT1743
2-Channel PWM Controller for LCD Display
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
6
AT1743
2-Channel PWM Controller for LCD Display
Application Circuit: Step-Down converter
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
7
AT1743
2-Channel PWM Controller for LCD Display
Package Outline 16-pin TSSOP
SYMBOL
A
A1
A2
b
C
D
E
E1
L
e
y
θ
MILLIMETERS
MIN
TYP
MAX
1.05
1.10
1.20
0.05
0.10
0.15
1.00
1.05
0.20
0.25
0.28
0.127
4.90
5.075
5.10
6.20
6.40
6.60
4.30
4.40
4.50
0.50
0.60
0.70
0.65
0.076
0°
8°
MIN
0.041
0.002
0.008
0.193
0.244
0.170
0.020
0°
INCHES
TYP
0.043
0.004
0.039
0.010
0.005
0.1998
0.252
0.173
0.024
0.026
-
MAX
0.047
0.006
0.041
0.011
0.200
0.260
0.177
0.028
0.003
8°
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
8
AT1743
2-Channel PWM Controller for LCD Display
Reflow Condition (IR/Convection or VPR Reflow)
Reference JEDEC Standard J-STD-020A
Classification Reflow Profiles
Convection or
IR/Convction
Average Heating Rate(180°C to peak)
5°C/second max.
120 seconds max.
Preheat Temperature(125±20°C)
10~150 seconds
Temperature maintained above 180°C
Time within 5°C of actual Peak 10~20 seconds
Temperature
Peak Temperature Range(Note 1)
219~225°C or
235~240°C
Cooling Rate
6°C /second max.
6 minutes max.
Time 25°C to Peak Temperature
VPR
10°C/second max.
60 seconds
219~225°C or
235~240°C
10°C/second max.
*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
Pkg. Volume ≥350 mm3 Pkg. Volume <350 mm3
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
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
9