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BD81A34MUV-M Datasheet(PDF) 2 Page - Rohm |
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BD81A34MUV-M Datasheet(HTML) 2 Page - Rohm |
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2 / 36 page  2/33 Datasheet Datasheet BD81A34MUV-M BD81A34EFV-M TSZ02201-0G3G0C600020-1-2 © 2014 ROHM Co., Ltd. All rights reserved. 16.Jan.2014 Rev.002 www.rohm.com TSZ22111 ・15・001 COMP ERR AMP VREG ＋ － VCC EN RT OVP OSC SS Control Logic UVLO TSD － ＋ SS PWM LED1 LED2 Current driver ISET PGND PWM CS FAIL1 － VREG ISET BOOT SW ＋ － FAIL2 LEDEN1 SYNC VREG Timer Latch PWM OCP DRV CTL SLOPE OCP OVP Open Short Detect Timer Latch Short Det Open Det LED3 LED4 － － OUTL DGND VDISC OUTH LEDEN2 GND FB OVP FB － Pin Configuration Pin Description VQFN28SV5050 (Top view) HTSSOP-B28 (Top view) Block Diagram VQFN28 SV5050 HTSSOP -B28 Pin Name Function 1 11 LEDEN1 LED output pin enable terminal 1 2 12 LEDEN2 LED output pin enable terminal 2 3 13 LED1 LED output terminal 1 4 14 LED2 LED output terminal 2 5 15 LED3 LED output terminal 3 6 16 LED4 LED output terminal 4 7 17 OVP Over-voltage detection terminal 8 18 FB Pre-boost up voltage setting pin 9 19 PGND LED output GND terminal 10 20 OUTL Low side FET gate terminal 11 21 DGND DC/DC output GND terminal 12 22 VDISC Output voltage discharge terminal 13 23 SW High side FET source terminal 14 24 OUTH High side FET gate terminal 15 25 BOOT High side FET driver power supply terminal 16 26 VREG Internal constant voltage 17 27 EN Enable terminal 18 28 CS DC/DC current sense terminal 19 1 VCC Input power supply terminal 20 2 SS “Soft Start” Capacitor connection 21 3 COMP ERR AMP output 22 4 RT Oscillation Frequency-setting resistance input 23 5 SYNC External synchronization input terminal 24 6 ISET LED Output current setting pin 25 7 GND Small signal GND terminal 26 8 PWM PWM light modulation input terminal 27 9 FAIL1 “Failure” signal output terminal 28 10 FAIL2 LED open/short detection output signal - - Thermal PAD Please connect to back surface heat dissipation PAD GND. Figure 3. Internal Block Figure 2. Pin Placement |
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