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參數(shù)資料
| 型號(hào)： | AT1780 |
| 廠商： | Aimtron Technology Corp. |
| 英文描述： | 640kHz/1.2MHz,Low-Noise Step-Up Current-Mode PWM Controller |
| 中文描述： | 640kHz/1.2MHz，低噪聲升壓型電流模式PWM控制器 |
| 文件頁(yè)數(shù)： | 1/9頁(yè) |
| 文件大小： | 336K |
| 代理商： | AT1780 |
AT1780
Preliminary Product Information
640kHz/1.2MHz,Low-Noise Step-Up
Current-Mode PWM Controller
Features
1.6A,0.21
Ω
,14V Power MOSFET
Operating input voltage:+2.6V to +5.5V
Adjustable Output from V
IN
to 12V
640kHz /1.2MHz pin selectable switching
Frequency
0.1
μ
A shutdown Current
Built-in Soft-Start function
Small 8-Pin MSOP
Package
Applications
LCD Displays
Digital Cameras
Portable Applications
Hand-Held Devices
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:
service@aimtron.com.tw
1
General Description
The AT1780 is a current-mode step-up DC/DC
converter with a 1.6A, 0.21
Ω
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
FB
-
+
CURRENT
SENSE
-
+
COMP
SHDN
GND
LX
SS
VIN
SOFT-
START
Oscillator
Ramp
Generator
FSLC
1.24V
Error
Amplifier
Comparator
Enable
BIAS
Clock
N
4uA
gm
-
+
R
S
Q
+
+
Power
ON/OFF
Reference
1.24V
Aimtron reserves the right without notice to change this circuitry and specifications.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT1780M-GRE | 制造商:AIMTRON 制造商全稱:AIMTRON 功能描述:640kHz/1.2MHz,Low-Noise Step-Up Current-Mode PWM Controller |
| AT178569 | 制造商:NA 功能描述: |
| AT1792 | 制造商:AIMTRON 制造商全稱:AIMTRON 功能描述:2A/18V/300KHz Step-Down Voltage Regulator |
| AT1792X-GRE | 制造商:AIMTRON 制造商全稱:AIMTRON 功能描述:2A/18V/300KHz Step-Down Voltage Regulator |
| AT1796 | 制造商:AIMTRON 制造商全稱:AIMTRON 功能描述:150kHz, 3A Step-Down Switching Regulator |
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