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PDF AT1731 Data sheet ( Hoja de datos )
| Número de pieza | AT1731 | |
| Descripción | 2-Channel PWM Controller | |
| Fabricantes | Aimtron Technology | |
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AT1731
Preliminary
2-Channel PWM Controller for LCD Bias
Features
• Low input voltage: 2.5V to 7V
• 2-Channels PWM Control:
1 Boost Controller(CH1)
1 Inverting Controller (CH2)
• Adjustable Soft start time and maximum duty
cycle
• Built-in timer latch for short circuit protection:
Delay time=216/(Switching frequency)
• Built-in under-voltage lockout, thermal
shutdown.
• High operating frequency: 100kHz to 1MHz
General Description
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).
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
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
1
1 page  
AT1731
Preliminary
2-Channel PWM Controller for LCD Bias
Charge Current of
CS2(Sink)
Max. Duty of CH1
Max. Duty of CH2
Invalid TL threshold
voltage of CS1
Invalid TL threshold
voltage of CS2
Threshold Voltage of
FB1
Timer Latch Section Threshold Voltage of
(TL) FB2
Start up count
Start up time
Thermal Shuntdown
Section
Threshold Temperature
Output Section
Rise time of OUT1
Rise time of OUT3
Fall time of OUT1
Fall time of OUT2
High Level on
Resistance of OUT1
Low Level on
Resistance of OUT1
High Level on
Resistance of OUT2
Low Level on
Resistance of OUT2
ICS3
fOSC=500KHz
fOSC=500KHz
1.0 mA
80 87 90 %
80 86 90 %
0.3 V
1.32.
V
VTLTH1
1.32
VTLTH2
Count
TTL
0.3
216
105 119 137
TOH 140
tr1
CO =1000pF between
OUT1-GND
20
25
35
Tr2
CO =1000pF between
VCC-OUT2
20
25
35
tf1
CO =1000pF between
OUT1-GND
20
25
35
tf2
CO =1000pF between
VCC-OUT2
20
25
35
R1AH IOUT1=-150mA
2.5 4.0 5.5
R1AL
R2AH
R2AL
IOUT1=150mA
IOUT2=-150mA
IOUT2=150mA
2.5 4.0 5.5
2.5 4.0 5.5
2.5 4.0 5.5
V
V
ms
0C
ns
ns
ns
ns
Ω
Ω
Ω
Ω
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
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AT1731.PDF ] | |
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