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BA00CC0WCPTR データシート(PDF) 7 Page - Rohm |
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BA00CC0WCPTR データシート(HTML) 7 Page - Rohm |
7 / 20 page 7/22 Datasheet Datasheet BD60A00NUX BD60A60NUX © 2012 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111・15・001 TSZ02201-0G3G0C200320-1-2 27.SEP.2012 Rev.001 ●Main characteristics examples - continued ・ BD60A00NUX PWM duty – LED current IC Power=5.0V, LED 8serial, LED current =25mA, PWM frequency = 20 kHz, Ta=25deg coil 1094AS-10M (TOKO), SBD RB060M-60TR (ROHM) ●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. This output controls internal Nch Tr via the RS latch. In the period where internal Nch Tr gate is ON, energy is accumulated in the external inductor, and in the period where internal Nch Tr gate is OFF, energy is transferred to the output capacitor via external SBD. This IC has many safety functions, and their detection signals stop switching operation at once. 2) Soft Start This IC has soft start function, which prevents rush current at turning on. After EN and PWM are changed L H, soft start becomes effective within 1ms. Soft start doesn't become effective even if Enable is changed L H, after that. By changing EN and PWM L H, soft start can become effective. Since a soft start function stops working at the time of following PWM=H when EN=H is held with PWM=L After EN=H should input a PWM signal within 10ms. PWM OFF ON ON OFF OFF OFF ON OFF OFF EN Soft Start Soft Start Reset Reset Reset Soft start time Finish PWM EN Within 10ms Figure 2. Soft start Possible to Duty 0.4% at PWM=20 kHz 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 0.01 0.10 1.00 10.00 100.00 0.1 1.0 10.0 100.0 PWM duty (%) 0.4% |
同様の部品番号 - BA00CC0WCPTR |
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同様の説明 - BA00CC0WCPTR |
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