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부품번호 | AT1780 기능 |
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기능 | Low-Noise Step-Up Current-Mode PWM Controller | ||
제조업체 | Aimtron Technology | ||
로고 | |||
www.DataSheet4U.com
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
AT1780
Preliminary Product Information
640kHz/1.2MHz,Low-Noise Step-Up
Current-Mode PWM Controller
Electrical Characteristics
(VIN = SHDN = 3V, FREQ = GND, TA =0℃ to +85℃, unless otherwise noted. Typical values are at TA = +25℃.)
Parameter
Symbol
Condition
Values
Unit
Min. Typ. Max.
Entire device
Error amplifier
Sawtooth wave
oscillator (OSC)
N-CHANNEL
SWITCH
Input Supply Range
VIN Undervoltage
Lockout
Quiescent Current
Shutdown Supply
Current
Feedback Voltage
FB Input Bias Current
Feedback-Voltage Line
Regulation
Transconductance
Voltage Gain
Frequency
Maximum Duty Cycle
Current Limit
On-Resistance
Leakage Current
VIN
UVLO
IIN
IIN
VFB
IFB
gm
Av
fosc
DC
ILIM
RON
ILXOFF
VIN rising, typical
hysteresis is 40mV,LX
remains off below this
level
VFB = 1.3V, not
switching
VFB = 1.0V, switching
2.6 5.5
2.1 2.3 2.5
0.218 0.35
2.045 5
V
V
mA
/SHDN = GND
0.1 10 μA
Level to produce
VCOMP = 1.24V
VFB = 1.25V
1.222 1.24 1.258 V
0 40 nA
Level to produce
VCOMP = 1.24V,
2.6V < VIN < 5.5V
ΔI = 5µA
0.05 0.15 %/V
140 μmhos
-- 500 V/V
FSLC = GND
FSLC = IN
540
1050
640
1200
740
1350
kHz
FSLC = GND
FSLC = IN
79 91.3 92
82.1
%
VFB = 1V, duty cycle =
65%
1.2
1.6
2.3
A
ILX = 1.2A
0.21 0.5 Ω
VLX = 12V
0.01 20 μA
SOFT-START
Current-Sense
Transresistance
Reset Switch
Resistance
Charge Current
Input Low Voltage
Input High Voltage
CONTROL INPUTS Hysteresis
FSLC Pull-Down
Current
/SHDN Input Current
RCS
VIL
VIH
IFSLC
ISHDN
VSS = 1.2V
/SHDN, FREQ;
VIN = 2.6V to 5.5V
/SHDN, FREQ;
VIN = 2.6V to 5.5V
SHDN, FREQ
0.3 0.45 0.65 V/A
100 Ω
1.5 4 7 μA
0.4 V
1.6
100
1.5 5
0.001
9
1
V
mV
μA
μA
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]
4
4페이지 AT1780
Preliminary Product Information
640kHz/1.2MHz,Low-Noise Step-Up
Current-Mode PWM Controller
Typical Application Circuit
2V.i6nV to 5.5V
L1
D1
Vout
Cin
C1
0.1UF
Rcomp
Ccomp
Aimtron AT1780
6 VIN
LX
3 /SHDN
FB
1 COMP
FLSC
4 GND
SS
5
2
7
8
Ccomp1
Css
Cout R1
Cout
R2
Figure 1.Typical application circuit
Vin
3.0V to 3.6V
22UF
4.7UH
C1
0.1UF
30K
470PF
Aimtron AT1780
6 VIN
LX
3 /SHDN
FB
1 COMP
FLSC
4 GND
SS
5
2
7
8
18PF
0.033UF
CRS01
10UF 332K
VAA
10V/150mA
10UF
47K
0.1UF
D2
0.1UF
D3 D4
1UF
D5
0.1UF D7
D6
VGL
-10V/10mA
4.7UF
VGH
30V/5mA
1UF
Figure 2.TFT panel power supply application circuit
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]
7
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부품번호 | 상세설명 및 기능 | 제조사 |
AT1780 | Low-Noise Step-Up Current-Mode PWM Controller | Aimtron Technology |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |