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PDF AT1780 Data sheet ( Hoja de datos )
| Número de pieza | AT1780 | |
| Descripción | Low-Noise Step-Up Current-Mode PWM Controller | |
| Fabricantes | Aimtron Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AT1780 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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AT1780
Preliminary Product Information
640kHz/1.2MHz,Low-Noise Step-Up
Current-Mode PWM Controller
Features
• 1.6A,0.21Ω,14V Power MOSFET
• Operating input voltage:+2.6V to +5.5V
• Adjustable Output from VIN to 12V
• 640kHz /1.2MHz pin selectable switching
Frequency
• 0.1μA shutdown Current
• Built-in Soft-Start function
• Small 8-Pin MSOP Package
Applications
• LCD Displays
• Digital Cameras
• Portable Applications
• Hand-Held Devices
General Description
The AT1780 is a current-mode step-up DC/DC
converter with a 1.6A, 0.21Ω power MOSFET.
The soft-start function is programmed with an
external capacitor, which sets the input current
ramp rate. It is ideal for generating bias voltages
for LCD panels. Pin selectable frequency 640KHz
or 1.2MHz operation results in a low noise output
that is easy to filter and faster loop performance.
An external compensation pin provides the user
flexibility in determining loop dynamics, allowing
the use of small, low equivalent series resistance
(ESR) ceramic output capacitors.
*Protected by U.S. Patent # 6,791,368
Block Diagram
VIN
COMP
SHDN
FB
FSLC
Power
ON/OFF
Reference
1.24V
SOFT-
START
1.24V
Error
Amplifier
-
gm
+
BIAS
-
+
Enable
Comparator
-
+
Clock
R
S
Oscillator
Ramp
Generator
+
+
Q
CURRENT
SENSE
4uA
SS
LX
N
GND
Aimtron reserves the right without notice to change this circuitry and specifications.
7F, No.9, PARK AVENUE 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
3/24/06 REV 1.1
Email: [email protected]
1
1 page  
AT1780
Preliminary Product Information
640kHz/1.2MHz,Low-Noise Step-Up
Current-Mode PWM Controller
Typical Characteristics
(VIN = 3.3V, FREQ = GND, TA=25℃, unless otherwise noted.)
Efficiency vs. Output current
95
95
Efficiency vs. Output current
90 90
85 85
80 80
75 75
70
65
1
10 100
Output current Iout (mA)
Vin=3.3V
Vout=10V
fosc=640kHz
L=10uH
1000
70
65
1
10 100
Output current Iout (mA)
Vin=3.3V
Vout=10V
fosc=1.2MHz
L=4.7uH
1000
10.10
10.05
10.00
9.95
9.90
9.85
9.80
9.75
9.70
9.65
Output voltage vs. Output current
Vin=3.3V
Vout=10V
fosc=640kHz
L=10uH
0 40 80 120 160 200 240
Output current Iout (mA)
10.10
10.05
10.00
9.95
9.90
9.85
9.80
9.75
9.70
9.65
Output voltage vs. Output current
Vin=3.3V
Vout=10V
fosc=1.2MHz
L=4.7uH
0 40 80 120 160 200 240
Output current Iout (mA)
CH1:Output voltage,100mV/div/AC
CH4:Output current,100mA/div/DC
Vout=10V,fosc=640kHz,L=10uH
R1=100k,C1=470PF,C2=18PF
CH1:Output voltage,100mV/div/AC
CH4:Output current,100mA/div/DC
Vout=10V,fosc=1.2MHz,L=4.7uH
R1=100k,C1=470PF,C2=18PF
7F, No.9, PARK AVENUE 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
3/24/06 REV 1.1
Email: [email protected]
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet AT1780.PDF ] | |
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