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New Japan Radio

NJM3776D2 Datasheet Preview

NJM3776D2 Datasheet

DUAL CONTROLLER FOR HIGH-CURRENT STEPPER MOTOR

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NJM3776
DUAL CONTROLLER FOR HIGH-CURRENT STEPPER MOTOR
s GENERAL DESCRIPTION
The NJM3776 is a switch-mode (chopper), constant-current
controller intended for controlling external transistors in a high
current stepper motor application. The NJM3776 has two channels,
one for each winding of a two-phase stepper motor. The NJM3776
is equipped with a Disable input to simplify half stepping operation.
The NJM3776 contains a clock oscillator, which is common for both
driver channels, a set of comparators and flip-flops implementing
the switching control, and two output sections each containing four
outputs, two source and two sink, intended to drive an external H-
bridge. Voltage supply requirements are +5 V for logic and +10 to
+45 V for the outputs.
s PACKAGE OUTLINE
NJM3776D2
s FEATURES
• Suitable to drive any external MOS FET or bipolar power transistor
• Cross conduction prevented by time delay
• Digital filter on chip eliminates external filtering components
• Package DIP24
s BLOCK DIAGRAM
Phase 1
Dis 1 VR1
C1
SGND 1
Pwr GND 1
1
NJM3776
VCC
V
CC
+
RQ
S
Logic
RC
Figure 1. Block diagram
+
Logic
+
SQ
R
Phase 2
Dis2 VR2
C2
SGND 2
Pwr GND 2
T1BL
T1AL
T1AU
T1BU
VBB1
VBB2
T2BU
T2AU
T2AL
T2BL




New Japan Radio

NJM3776D2 Datasheet Preview

NJM3776D2 Datasheet

DUAL CONTROLLER FOR HIGH-CURRENT STEPPER MOTOR

No Preview Available !

s PIN CONFIGURATION
NJM3776
Figure 2. Pin configuration
PWR GND 1 1
T1BL 2
24 PWR GND 2
23 T2BL
T1BU 3
22 T2BU
T1AL 4
21 T2AL
T1AU 5
20 T2AU
VBB1 6
SGND 1 7
VR1 8
C1 9
Phase 1 10
Dis 1 11
RC 12
NJM 19 VBB 2
3776D2 18 SGND 2
17 VR2
16 C2
15 Phase 2
14 Dis 2
13 Vcc
s PIN DESCRIPTION
DIP
Symbol
Description
1
PWR GND 1 "Power Ground" from output channel 1. Connected to the ground path (see application examples).
2
T1BL
Output, channel 1, B side lower transistor. The pin will sink current when phase is high.
3
T1BU
Output, channel 1, B side upper transistor. The pin will source current when phase is low.
4
T1AL
Output, channel 1, A side lower transistor. The pin will sink current when phase is low.
5
T1AU
Output, channel 1, A side upper transistor. The pin will source current when phase is high.
6
VBB1
Supply voltage for driving channel 1 outputs.
7
SGND 1
Sense ground channel 1. Logic ground reference and sense ground for the current control feedback-
loop.
8
VR1
Reference voltage, channel 1. Controls the comparator threshold voltage and hence the output
current.
9
C
1
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.
10
Phase1
11
Dis1
Controls the direction of channel 1 outputs T1AL, T1AU, T1BL and T1BU.
Disable input for channel 1. When HIGH, all four output transistors are turned off, which results in a
rapidly decreasing output current to zero.
12
RC
Clock oscillator RC pin. Connect a 12 kohm resistor to VCC 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.
13
Vcc
Logic voltage supply, nominally +5 V.
14
Dis2
Disable input for channel 2. When HIGH, all four output transistors are turned off, which results in a
rapidly decreasing output current to zero.
15
Phase2
16
C2
Controls the direction of channel 2 outputs T2AL, T2AU, T2BL and T2BU.
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.
17
VR
2
Reference voltage, channel 2. Controls the comparator threshold voltage and hence the output
current.
18
SGND 2
Sense ground channel 1. Logic ground reference and sense ground for the current control feedback-
loop.
19
VBB2
Supply voltage for driving channel 2 outputs.
20
T2AU
Output, channel 2, A side upper transistor. The pin will source current when phase is high.
21
T2AL
Output, channel 2, A side lower transistor. The pin will sink current when phase is low.
22
T2BU
Output, channel 2, B side upper transistor. The pin will source current when phase is low.
23
T2BL
Output, channel 2, B side lower transistor. The pin will sink current when phase is high.
24
PWR GND 2 "Power Ground" from output channel 2. Connected to the ground path (see application examples).


Part Number NJM3776D2
Description DUAL CONTROLLER FOR HIGH-CURRENT STEPPER MOTOR
Maker New Japan Radio
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