Key facts
- Brand
- Ricoh
- Model
- R1204X
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-07-09
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Ricoh R1204x Series Step-up DC/DC Converter Datasheet
The R1204x Series are low supply current CMOS-based PWM step-up DC/DC converters. Internally, a single 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), an over-voltage protection circuit (OVP), a soft-start circuit, a maximum duty cycle limit circuit, and a thermal shutdown protection circuit.
The series provides R1204xxxA/D versions optimized for serial driving of white LEDs with constant current, and R1204xxxB/C/E/F versions optimized for constant voltage driving. Among the latter, only R1204xxxC/F versions are equipped with PWM/VFM auto-switching controls.
Ricoh R1204X specifications
| Input Voltage Range | 2.3V to 5.5V |
|---|---|
| Supply Current (Typical) | 800uA |
| Feedback Voltage (R1204xxxxB/C/E/F) | 1.0V +/- 15mV |
| Lx Current Limit Function | Min. 700mA |
| Over Voltage Protection Thresholds | 23V, 33V, 42V (+1.5V) |
| Oscillator Frequency (R1204xxxxA/B/C) | Typ. 1.0MHz |
| FET ON Resistance | Typ. 0.8 Ohm |
| Operating Temperature Range | -40 to +85 °C |
Source: Ricoh R1204x Series Step-up DC/DC Converter Datasheet
All Ricoh R1204X documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What are the available versions for white LED driving?
The R1204xxxA/D versions are optimized for serial driving of white LEDs with constant current.
Which versions support PWM/VFM auto-switching controls?
Only the R1204xxxC/F versions among the constant voltage optimized series (B/C/E/F) are equipped with PWM/VFM auto-switching controls.
What are the two types of R1204x Series converters?
The A/D versions are optimized for general use or PMOLED drives, while B/C/E/F versions are optimized for serial white LED driving.
From: Ricoh R1204x Series PWM/VFM Step-up DC/DC Converter Datasheet
What is the frequency range for the PWM signal?
The PWM signal frequency can be set between 200Hz to 300kHz.
From: Ricoh R1204x Series PWM/VFM Step-up DC/DC Converter Datasheet