NJM3777 datasheet(2/10 Pages) NJRC

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NJM3777

Figure 2. Pin configuration

s PIN DESCRIPTION

EMP

Symbol

Description

Not connected

Motor output B, channel 1. Motor current flows from M

A1 to MB1 when Phase1 is HIGH.

Common emitter, channel 1. This pin connects to a sensing resistor R

to ground.

Motor output A, channel 1. Motor current flows from M

A1 to MB1 when Phase1 is HIGH.

MM1

Motor supply voltage, channel 1, +10 to +40 V. V

MM1 and VMM2 should be connected together.

6, 7,

GND

Ground and negative supply. Note: these pins are used thermally for heat-sinking.

18, 19

Make sure that all ground pins are soldered onto a suitably large copper ground plane for efficient heat -

sinking.

Reference voltage, channel 1. Controls the comparator threshold voltage and hence the output current.

Comparator input channel 1. This input senses the instantaneous voltage across the sensing resistor,

filtered by the internal digital filter or an optional external RC network.

Phase

Controls the direction of motor current at outputs M

A1 and MB1. Motor current flows from MA1 to MB1 when

Phase

1 is HIGH.

Dis

Disable input for channel 1. When HIGH, all four output transistors are turned off, which results in a

rapidly decreasing output current to zero.

Clock oscillator RC pin. Connect a 12 kohm resistor to V

CC and a 4 700 pF capacitor to ground to obtain

the nominal switching frequency of 23.0 kHz and a digital filter blanking time of 1.0

µs.

Logic voltage supply, nominally +5 V.

Dis

Disable input for channel 2. When HIGH, all four output transistors are turned off, which results in a

rapidly decreasing output current to zero.

Phase

Controls the direction of motor current at outputs M

A2 and MB2. Motor current flows from MA2 to MB2 when

Phase

2 is HIGH.

Comparator input channel 2. This input senses the instantaneous voltage across the sensing resistor,

filtered by the internal digital filter or an optional external RC network.

Reference voltage, channel 2. Controls the comparator threshold voltage and hence the output current.

MM2

Motor supply voltage, channel 2, +10 to +40 V. V

MM1 and VMM2 should be connected together.

Motor output A, channel 2. Motor current flows from M

A2 to MB2 when Phase2 is HIGH.

Common emitter, channel 2. This pin connects to a sensing resistor R

S to ground.

Motor output B, channel 2. Motor current flows from M

A2 to MB2 when Phase2 is HIGH.

Not connected

GND

MA1

Dis1

MA2

GND

Phase1

NJM

3777E3

MB1

VMM1

MB2

VMM2

VR1

VR2

Dis2

GND

Phase2

s PIN CONFIGURATION

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