yb1520 YOBON TECHNOLOGIES,INC., yb1520 Datasheet
yb1520
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yb1520 Summary of contents
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... The YB1520 can drive white LEDs from a 4.5V supply. The wide input voltage range from 2. ideal for portable (5V) applications with higher conversion efficiency. To control LED brightness, the ...
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... Switching from 0.4V to 2.0V, PWM duty cycle controls the LED current. Input Supply Pin. Bypass this pin with a capacitor as close to the 5 VIN device as possible. Ordering Information Order Number Package Type YB1520ST25 SOT23-5 YB1520 Rev.1 SOT23-5 Figure 2: Pin Configuration Description Supplied As 3000 units Tape & Reel www ...
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... P power dissipation will cause excessive die temperature. All limits at temperature extremes are guaranteed via correlation using standard statistical methods. YB1520 Rev.1.4 Recommended Operating Conditions Operating Temperature......... -40°C to 85°C Supply Voltage........................... 2. Voltage...........................................20V ............... 150° ...
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... Step-up DC-DC Converter, White LED Driver Typical Performance Characteristics Vout Ripple Vin & Efficiency 89% 88% 87% 86% 85% 84% 4 4.5 5 VIN(V) YB1520 Rev.1.4 104 103 102 101 100 4 4.5 5.5 6 www.yobon.com.tw YB1520 SW Waveform Vin & Iout 5 5.5 6 Vin (V) 4 ...
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... Step-up DC-DC Converter, White LED Driver Vout Ripple Vin & Efficiency 90% 88% 86% 84% 82% 4 4.5 5 VIN(V) YB1520 Rev.1.4 129 128 127 126 125 124 123 122 5 www.yobon.com.tw YB1520 SW Waveform Vin & Iout 4.5 5 5.5 6 Vin (V) 5 ...
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... Typical Performance Characteristics Drive Switch Saturation Voltage(Vcesat) 160 140 120 100 100 150 Switch Current(mA) Switch Leakage Current 1 0.9 0.8 0.7 0.6 0 Vin(V) YB1520 Rev.1.4 730 725 720 715 710 705 700 695 200 250 300 0 2.5 2 1 www.yobon.com.tw YB1520 Switching Frequency ...
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... Step-up DC-DC Converter, White LED Driver Function Block Operation The YB1520 uses a constant frequency, current mode control scheme to regulate the output LED current. Its operation can be understood by referring to the block diagram in Figure 3. At the start of each oscillator cycle, a voltage proportional to the switch current is added to a ramp output and the resulting sum is fed into the positive terminal of the PWM comparator ...
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... Figure 5: Dimming Control Using a Filtered PWM Signal (1KHz, 2Vp-p, duty 20%~80%) YB1520 Rev.1.4 Over Voltage Protection The YB1520 has an internal over voltage protection circuit which also acts as an open-circuit protection. In the cases of open circuit or the LEDs failure, the LEDs are disconnected from the circuit, and the feedback voltage will be zero ...
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... GND pin. Trace connections made to the inductor and Schottky diode should be minimized to reduce power dissipation and increase overall efficiency. YB1520 Rev.1 shown IN copper trace capacitor can The ground resistor ...
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... Step-up DC-DC Converter, White LED Driver Package Information (SOT23-5) NOTICE: The information described herein is subject to change without notice. Yobon does not assume any responsibility for use of any circuitry or applications described herein, nor does it convey any patent license. YB1520 Rev.1.4 www.yobon.com.tw YB1520 10 ...