R1204x Series Step-up DC/DC Converter with Shutdown Function
■ The R1204x is a low supply current PWM step-up DC/DC converter. 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. By simply using an inductor, a resistor, capacitors and a diode as external components, a high-efficiency step-up DC/DC converter can be easily configured. As protection functions, the IC contains a thermal shutdown protection circuit, a current limit circuit, an OVP circuit, and an UVLO circuit. A thermal shutdown circuit detects overheating of the ICs and stops the operation to protect it from damage. A current limit circuit limits the peak current of Lx, and an OVP circuit detects the over voltage of output, and an UVLO circuit detects the low input voltage.
■ The R1204x provides the R1204xxxA/D/G/H versions, which are optimized for serial driving of white LEDs with constant current, and the R1204xxxB/C/E/F versions, which are optimized for constant voltage driving. Among the R1204xxxB/C/E/F versions, only the R1204xxxC/F versions are equipped with PWM/VFM auto-switching controls. The LED current can be determined by the value of current setting resistor. The brightness of the LEDs can be quickly adjusted by applying a PWM signal (200 Hz to 300 kHz) to the CE pin. The R1204x is available in DFN(PLP)1820-6 and TSOT-23- 6 packages.
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R1204x Series 、 R1204x 、 R1204xxxxA 、 R1204xxxxx 、 R1204xxxxC 、 R1204Nxx3B 、 R1204Kxy2z-TR 、 R1204xxxxF 、 R1204xxxxD 、 R1204xxxxG 、 R1204Kxx2B 、 R1204Kxx2A 、 R1204xxxB 、 R1204x2xxx 、 R1204xxxxB 、 R1204Nxy3z-TR-FE 、 R1204x3xxx 、 R1204xxxC 、 R1204x1xxx 、 R1204Nxx3A 、 R1204xxxA 、 R1204xxxxE |
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Step-up DC/DC Converter 、 low supply current PWM step-up DC/DC converter |
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Datasheet |
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Please see the document for details |
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DFN(PLP)1820-6;TSOT-23-6 |
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English Chinese Chinese and English Japanese |
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200901 |
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EA-284-200901 |
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2.4 MB |
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