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BA00CC0WTTR Arkusz danych(PDF) 7 Page - Rohm

Numer części BA00CC0WTTR
Szczegółowy opis  2A/1A Variable Output
Download  20 Pages
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Producent  ROHM [Rohm]
Strona internetowa  http://www.rohm.com
Logo ROHM - Rohm

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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%


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