NJM2640E-TE1 NJR, NJM2640E-TE1 Datasheet - Page 7

• Manufacturer Part Number: NJM2640E-TE1
• Description: Motor / Motion / Ignition Controllers & Drivers 2-Phase DC Brushless Motor Pre-Driver IC
• Manufacturer: NJR
• Type: Two Phase Unipolar DC Brushless Motor Pre-Driver ICr

Specifications of NJM2640E-TE1

• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 4 V to 55 V
• Supply Current: 3 mA to 4 mA
• Mounting Style: SMD/SMT
• Package / Case: EMP-8
• Operating Temperature: - 40 C to + 85 C
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

6. VCC input (Design of Ra and Ca)
7. Protection from active power on and off (D2)
There are two methodologies to consume kick back voltage:
1) By insertion of ZD1 (zenner diode connected between Base and Emitter of TR1)
2) By insertion of ZD2 (zenner diode connected between Collector and Emitter of TR1)
0.1 F. A ceramic type is recommended and it must be place near VCC and Gnd.
destruction.
Ra and Ca must be used if VCC exceeds operating voltage range of NJM2640.
Example) VCC 60V Application
Ca is used if NJM2640 is oscillated or shows unstable operation. A typical value Ca is from 0.01 F to
Inserting Ra and Ca also improves ESD immunity.
If an application requires active power on and off, TR1 (TR2) may be damaged or resulted in
In such application, adding diode between motor winding and Gnd will reduce the damage.
Energy of kick back voltage is consumed by TR1(or TR2). When ZD1 is in operation, Collector
voltage is sum of Vbe and ZD1. Therefore, breakdown voltage of ZD1 must be lower than that of
TR1.
Energy of kick back voltage is consumed by ZD2. To protect TR1, breakdown voltage of ZD2 must be
lower than that of TR1.
This method is generally used when Energy of kick back voltage is large. In such application, power
rating of ZD must take in consideration.
Given that current consumption of NJM2640 is 4mA (at VCC=48V), Ra is given by:
Ra
4
60
10
48
3
3
k
The specifications on this data book are
only given for information, without any
guarantee as regards either mistakes or
omissions. The application circuit in this
data book are described only to show
representative usages of the product
and not intended for the guarantee or
permission of any right including the
industrial rights.
NJM2640
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