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參數(shù)資料
| 型號： | R1280D002X |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | Linear Sensor Photodiode Array; 896x1 Sensor-Elements Organization; 200 Dots-Per-Inch (DPI) Sensor Pitch; High Linearity and Uniformity; Wide Dynamic Range 2000:1 (66 dB); Low Image Lag 0.5% Typ; Operation to 5MHz |
| 中文描述： | 2聲道的PWM DC / DC控制器 |
| 文件頁數(shù)： | 1/26頁 |
| 文件大小： | 344K |
| 代理商： | R1280D002X |
2CH PWM DC/DC Controller
R1280D002X Series
2001.6.16
Rev. 1.10 - 1 -
I
OUTLINE
The R1280D002X Series are 2-channel PWM Step-up (as Channel 1)/Inverting (as Channel 2) DC/DC converter
controllers with CMOS process.
Each of the R1280D002X Series consists of an oscillator, a PWM control circuit, a reference voltage unit, an error
amplifier, a reference current unit, a protection circuit, and an under voltage lockout (UVLO) circuit. A high efficiency
Step-up/Inverting DC/DC converter can be composed of this IC with inductors, diodes, power MOSFETs, resisters,
and capacitors. Each Output Voltage can be adjustable with external resistors, while soft-start time can be adjustable
with external capacitors..
Maximum Duty Cycle of R1280D002A and C series can be also adjustable with external resistors.
Maximum Duty Cycle of R1280D002B is built-in as 90%(TYP.).
When CE pin of R1280D002B is set at GND level, this IC turns off external power MOSFETs of Step-up/Inverting as
Standby-mode.
Standby current is typically 0
μ
A.
As for a protection circuit, if Maximum duty cycle of either Step-up DC/DC converter side or Inverting DC/DC
converter side is continued for a certain time, the R1280D Series latch both external drivers with their off state by its
Latch-type protection circuit. Delay time for protection is internally fixed typically at 100ms. To release the protection
circuit, restart with power-on (Voltage supplier is equal or less than UVLO detector threshold level), or as for
R1280D002B, once after making the circuit be stand-by with chip enable pin and enable the circuit again.
I
FEATURES
G
Input Voltage Range
2.5V to 5.5V
G
Built-in Latch-type Protection Function by monitoring duty cycle (Fixed Delay Time TYP. 100ms)
G
Oscillator Frequency
700kHz(R1280D002A,B)/200kHz(r1280D002C)
G
Maximum Duty Cycle
TYP. 90%(Only applied to R1280D002B Series)
G
High Reference Voltage Accuracy
±
1.5%
G
U.V.L.O. Threshold
TYP. 2.2V (Hysteresis: TYP. 0.1V)
G
Small Package
thin SON-10 (package thickness MAX. 0.9mm)
I
APPLICATIONS
G
Constant Voltage Power Source for portable equipment.
G
Constant Voltage Power Source for LCD and CCD.
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