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R1280D002B-TR Datasheet

  • R1280D002B-TR

  • 2CH PWM DC/DC Controller

  • 344.31KB

  • 26頁

  • RICOH

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2001.6.16
2CH PWM DC/DC Controller
R1280D002X Series
s
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碌A(chǔ).
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.
s
FEATURES
q
Input Voltage Range
鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?/div>
2.5V to 5.5V
q
Built-in Latch-type Protection Function by monitoring duty cycle (Fixed Delay Time TYP. 100ms)
q
Oscillator Frequency
鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?/div>
700kHz(R1280D002A,B)/200kHz(r1280D002C)
q
Maximum Duty Cycle
鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?/div>
TYP. 90%(Only applied to R1280D002B Series)
q
High Reference Voltage Accuracy
鈥?鈥?鈥?鈥?鈥?鈥?鹵1.5%
q
U.V.L.O. Threshold
鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?/div>
TYP. 2.2V (Hysteresis: TYP. 0.1V)
q
Small Package
鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?/div>
thin SON-10 (package thickness MAX. 0.9mm)
s
APPLICATIONS
q
Constant Voltage Power Source for portable equipment.
q
Constant Voltage Power Source for LCD and CCD.
Rev. 1.10
-1-

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