Key facts
- Brand
- Ricoh
- Model
- R1203X
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-07-09
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Ricoh R1203x Series Step-Up DC/DC Converter for White LED Backlight Datasheet
The R1203x Series are PWM control type step-up DC/DC converter ICs with low supply current, fully dedicated to driving white LEDs with constant current. Each IC consists of an NMOS FET, an oscillator, a PWM comparator, a voltage reference unit, an error amplifier, a current limit circuit, an under voltage lockout circuit (UVLO), and an over-voltage protection circuit (OVP). The LEDs current can be set by an external resistance value, and dimming can be adjusted via the CE pin according to a PWM signal.
Read onlineRicoh R1203X specifications
| Input Voltage Range | 1.8V to 5.5V |
|---|---|
| Feedback Voltage | 0.2V |
| Feedback Voltage Accuracy | 1.0% |
| Maximum Duty Cycle | Typ. 91% |
| Switch ON Resistance | Typ. 1.35 Ohm |
| UVLO Detector Threshold | Typ. 1.6V |
| OVP Detector Threshold | Typ. 29.5V |
| Switching Control | PWM |
| LED dimming control | by external PWM signal (Frequency 200Hz to 300kHz) |
| Packages | DFN1616-6B, SOT-23-6 |
| Operating Temperature Range | -40 to 85 °C |
Source: Ricoh R1203x Series Step-Up DC/DC Converter for White LED Backlight Datasheet
All Ricoh R1203X documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the feedback voltage of the R1203x Series?
The feedback voltage is 0.2V, which results in small power loss by the current setting resistance.
From: Ricoh R1203x Series Step-Up DC/DC Converter for White LED Backlight Datasheet
What is the maximum duty cycle of the R1203x Series?
The maximum duty cycle is internally fixed at a typical value of 91%.
From: Ricoh R1203x Series Step-Up DC/DC Converter for White LED Backlight Datasheet
What is the input voltage range for the R1203x Series?
The input voltage range is -1.8V to 5.5V.
From: Ricoh R1203x Series PWM Step-up DC/DC Converter for White LED Datasheet
How can the brightness of the LEDs be adjusted?
Brightness is adjusted quickly by applying a PWM signal between 200Hz and 300kHz to the CE pin.
From: Ricoh R1203x Series PWM Step-up DC/DC Converter for White LED Datasheet