BD60A00NUX ROHM [Rohm], BD60A00NUX Datasheet
BD60A00NUX
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BD60A00NUX Summary of contents
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... IC power supply (2.7V~5.5V) and coil power supply (2.3V~20V) makes it possible to widen input range, which will be helpful to be applied to various kinds of applications. Over voltage setting can be selected corresponding to the number of LED lightings. BD60A00NUX is for max 11 lightings, BD60A60NUX is for max 6 lightings. ●Features 1) Boost DC/DC converter 2) Drive LED 11 lightings (VOUT=3.6V× ...
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... BD60A00NUX, BD60A60NUX ●Electrical characteristics (Unless otherwise specified, Ta=25℃, Vin=3.6V) Parameter Quiescent Current Current Consumption (No Boost) Current Consumption (Boost) [EN, PWM Terminal] Low Input Voltage range High Input Voltage range Pull down register [Switching Regulator] FB Terminal Control Voltage Switching Frequency Max Duty SW Transistor ON Resistor ...
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... BD60A00NUX, BD60A60NUX ●Block Diagram and Application L1 10μH Coil Power 2.3V to 20V Cbat 4.7μF Vin IC Power 2.7V to 5.5V Cin UVLO 1μF Q1 ・Pin assignment table PIN No. PIN Name VIN 3 PWM 4 ISET VOUT 7 GND 8 SW ●Terminal Diagram Vin www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. ...
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... BD60A00NUX, BD60A60NUX ●Main characteristics examples 1) Efficiency ●BD60A60NUX <efficiency – ILED> LED 6series, coil : VLF302512MT-100M ●BD60A00NUX <efficiency – ILED> LED 10series, coil : VLF302512MT-100M coil : VLF302512MT-100M www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 4/22 Technical Note 2011.12 - Rev.A ...
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... Vcoil ( Vcoil (V) 5/22 Technical Note BD60A00NUX Vcoil vs efficiency VIN=5V Ta=25℃ LED 8灯 (26V) coil 1094AS-10M(TOKO) eff1 SBD RB060M-60TR(ROHM) eff2 LED電 流 設 定 25mA PWM=100% eff1=(Vout*ILED)/(Vcoil*Icoil)*100 eff2=(Vout*ILED)/(Vcoil*Icoil+VIN+IVIN)*100 BD60A60 Vcoil vs efficiency VIN=5V ...
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... BD60A00NUX, BD60A60NUX VOUT LED current PWM PWM 20kHz Duty 50% VOUT LED current PWM www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 100mV/div 40µs/div 100mV/div 200ns/div PWM 20kHz Duty 1% 6/22 Technical Note 2011.12 - Rev.A ...
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... SBD RB060M-60TR(ROHM) 100.00 10.00 1.00 0.10 0.01 0.1 0.4% Possible to Duty 0.4% at PWM=20kHz www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 1.0 10.0 PWM duty (%) 7/22 Technical Note BD60A00NUX Vcoil vs efficiency VIN=5V Ta=25℃ LED 8 灯(26V) coil 1094AS-10M(TOKO) SBD RB060M-60TR(ROHM) LED current 25mA PWM frequency 20kHz 100.0 2011.12 - Rev.A ...
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... BD60A00NUX, BD60A60NUX ●Functional Descriptions 1) PWM current mode DC/DC converter This IC keeps output voltage invariably by setting PWM duty to make FB terminal 0.7V when the power is on. As for the inputs of the PWM comparator as the feature of the PWM current mode, one is overlapped with error components from the error amplifier, and the other is overlapped with a current sense signal that controls the inductor current into Slope waveform to prevent sub harmonic oscillation ...
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... BD60A00NUX, BD60A60NUX ●Protection ・Over voltage protection At such an error of output open as the output DC/DC and the LED is not connected to IC, the DC/DC boosts too much and the VOUT terminal exceeds the absolute maximum ratings, and may destruct the IC. Therefore, when the VOUT becomes sensing voltage or higher, the over voltage limit protection works, turns off the switching Tr, DC/DC will be stopped, and the output voltage goes down slowly ...
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... BD60A00NUX, BD60A60NUX ・LED terminal over voltage protection When FB terminal becomes higher than 5.9V(typ), IC senses the situation trouble after 100us and then stops constant current driver and DC/DC. Therefore IC becomes never heated, even if output and FB are both shorted. Moreover terminal becomes lower than 5.9V(typ), IC senses normal condition and activates constant current driver. ...
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... BD60A00NUX, BD60A60NUX ●Operating of the application deficiency 1) When 1 LED or 1string OPEN during the operating Since FB terminal is set to 0V when set to OPEN, Output boosts up to the over voltage protection voltage. When over voltage is detected, the boosting operation stops and then output voltage goes down slowly. Later, if output voltage becomes less than hysteresis of over current protection, output voltage keeps boosting up to over voltage protection voltage again ...
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... BD60A00NUX, BD60A60NUX 3) When Schottky diode(SBD) remove In the situation that connection is opened and also DC/DC is activated, SW terminal voltage becomes more than rated voltage due to a lack of parts that can accept the current accumulated inside the coil. Consequently IC might be destroyed. To prevent the IC destruction, SBD open protection is functioned. SW terminal is never destroyed as boosting operation is stopped after VOUT terminal detects less than 0 ...
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... BD60A00NUX, BD60A60NUX ●Brightness control There are two dimming method available; the first method is analog dimming that applies analog voltage to ISET terminal, and the second method is digital dimming that inputs PWM to PWM terminal. Since each method has the different merits, please choose a suitable method for the application of use. ...
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... BD60A00NUX, BD60A60NUX 3) The brightness control to set large current over IC max setting current is made by giving DC control voltage to VFB pin of IC via a series resistor as shown in under figure. LED luminance (current) changed by giving DC voltage to VFB directly. DC voltage is given from filtered one of DAC signal, or PWM signal shown in under figure. ...
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... BD60A00NUX, BD60A60NUX ●The coil selection The DC/DC is designed by more than 4.7µH. When L value sets to a lower value possibility that the specific sub-harmonic oscillation of current mode will be happened. Please do not let L value to 3.3µH or below. And, L value increases, the phase margin becomes to zero. Please enlarge the output capacitor value when you increase L value. ● ...
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... BD60A00NUX, BD60A60NUX ●The separation of the IC power supply and coil power supply This IC can work in separating the power source in both IC power supply and coil power supply. With this application, it can obtain that decrease of IC power consumption, and the applied voltage exceeds IC rating 5.5V. ...
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... Coil Power IC Power EN PWM VOUT ●Input voltage 5V（BD60A00NUX） The GND noise become big by impedance of PCB boards, so that wake up characteristics might become unstable. To select input voltage to 5V(input voltage 4.61V over), we recommend under application to insert 4.7Ω between input voltage line and Vin terminal 2.7V to 5.5V www.rohm.com © ...
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... The efficiency of heat radiation improves according to the area of ground plane. <Others> When those pins are not connected directly near the chip, influence is give to the performance of BD60A00NUX, and may limit the current drive performance. As for the wire to the inductor, make its resistance component small reduce electric power consumption and increase the entire efficiency ...
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... BD60A00NUX, BD60A60NUX ● Recommended PCB layout www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 19/22 Technical Note 2011.12 - Rev.A ...
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... BD60A00NUX, BD60A60NUX ●Selection of external parts Recommended external parts are as shown below. When to use other parts than these, select the following equivalent parts. L1: This coil is for boosting. Recommended capacity value is 10uH. Please use the coil with adequate direct current capacity and also low direct current resistor. ...
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... BD60A00NUX, BD60A60NUX ●Cautions on use (1) Absolute Maximum Ratings An excess in the absolute maximum ratings, such as supply voltage (Vin), temperature range of operating conditions (Topr), etc., can break down devices, thus making impossible to identify breaking mode such as a short circuit or an open circuit. If any special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical safety measures including the use of fuses, etc ...
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... BD60A00NUX, BD60A60NUX ●Ordering part number ROHM Part No. type name BD60A00:60A00 BD60A60:60A60 VSON008X2030 2.0±0.1 1PIN MARK 0.08 S 1.5±0.1 0.5 C0. 0.25 +0.05 0.25 −0.04 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved Package NUX: VSON008X2030 <Tape and Reel information> Tape Embossed carrier tape ...
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No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose ...