BM6112FV-C
Application Information
1. Description of Pins and Cautions on Layout of Board
(1) VCC1 (Input-side power supply pin)
The VCC1 pin is a power supply pin on the input side. To suppress voltage fluctuations due to the driving current of the
internal transformer, connect a bypass capacitor between the VCC1 and GND1 pins.
(2) GND1 (Input-side ground pin)
The GND1 pin is a ground pin on the input side.
(3) VCC2 (Output-side positive power supply pin)
The VCC2 pin is a positive power supply pin on the output side. To suppress voltage fluctuations due to the OUT1H pin
or the OUT1L pin output current and due to the driving current of the internal transformer and output current, connect a
bypass capacitor between the VCC2 and GND2 pins.
(4) VEE2 (Output-side negative power supply pin)
The VEE2 pin is a negative power supply pin on the output side. To suppress voltage fluctuations due to the OUT1H pin
or the OUT1L pin output current and due to the driving current of the internal transformer and output current, connect a
bypass capacitor between the VEE2 and GND2 pins. Connect the VEE2 pin to the GND2 pin when no negative power
supply is used.
(5) GND2 (Output-side ground pin)
The GND2 pin is a ground pin on the output side. Connect the GND2 pin to the emitter or source of output device.
(6) INA, INB, ENA (Control input pin)
The INA, INB, and ENA pins are pins used to determine output logic.
ENA
L
H
H
H
INB
Don’t care
INA
Don’t care
Don’t care
OUT1H
Hi-Z
Hi-Z
Hi-Z
H
OUT1L
L
L
L
H
L
L
L
H
Hi-Z
(7) FLT (Fault output pin)
The FLT pin is an open drain pin used to output a fault signal when short circuit protection (SCP) function is activated,
and will be released at the rising edge of the ENA.
State
FLT
Hi-Z
L
While in normal operation
When a Fault occurs (SCP)
(8) RDY (Ready output pin)
The RDY pin shows the status of three internal protection features which are VCC1 UVLO, VCC2 UVLO and output
state feedback (OSFB). The term "output state feedback" shows whether the PROOUT1 pin voltage (High or Low)
corresponds to input logic or not.
Status
RDY
Hi-Z
L
While in normal operation
VCC1 UVLO or VCC2 UVLO or Output state feedback
(9) SENSOR (Temperature information output pin)
This is a pin which outputs the voltage of the TO pin converted to Duty cycle.
(10) OUT1H, OUT1L (Source-side, Sink-side output pin)
The OUT1H pin is a source side pin used to drive the gate of a power device. The OUT1L pin is a sink side pin used to
drive the gate of a power device. The OUT1H pin is also used to monitor gate voltage for active miller clamping function.
(11) OUT2 (Gate control pin for active miller clamping)
The OUT2 pin is a pin used for controlling the external MOSFET to prevent an increase in gate voltage due to the miller
current of the power device connected to the OUT1H pin or the OUT1L pin.
(12) VREG (Power supply pin for driving MOSFET for active miller clamping)
The VREG pin is a power supply pin for active miller clamping (Typ 5 V). Be sure to connect a capacitor between the
VREG pin and the VEE2 pin to prevent oscillation and to suppress voltage fluctuations due to the OUT2 pin output
current.
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TSZ02201-0818ACH00110-1-2
18.Nov.2019 Rev.001
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