NJM2646E-TE1 NJR, NJM2646E-TE1 Datasheet - Page 7

• Manufacturer Part Number: NJM2646E-TE1
• Description: Motor / Motion / Ignition Controllers & Drivers 2-Phase DC Brushless Motor Pre-driver IC
• Manufacturer: NJR
• Type: 2 Phase DC Brushless Motor Driverr

Specifications of NJM2646E-TE1

• Operating Supply Voltage: 4 V to 15 V
• Supply Current: 10.5 mA
• Mounting Style: SMD/SMT
• Package / Case: EMP-8
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

4. Design of spike killer for power transistor (ZD1 and ZD2)
5. VCC input (Design of Ra and Ca)
7. Protection from active power on and off (D2)
A ceramic type is recommended and it must be place near VCC and Gnd.
can be obtained.
Ca is used if NJM2646 is oscillated or shows unstable operation. A typical value Ca is from 0.01 F to 0.1 F.
Ra
when power transistors is (TR1 and TR2) turned off from on.
Ra and Ca must be used if VCC exceeds operating voltage range of NJM2646.
Example) VCC 30V Application
Given that current consumption of NJM2646 is 10.5mA (at VCC=12V), Ra is given by:
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 destruction.
In such application, adding diode between motor winding and Gnd will reduce the damage.
The output voltage of hall elements is influenced by the bias current and magnetic flux density of hall elements.
The optimum input voltage of NJM2646 is 100mVp-p and higher. With such input voltage, the highest efficiency
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)
Zenner diodes (often referred as spike killer ) are used for limiting kick back voltage of motor winding generated
There are two methodologies to consume kick back voltage:
of Vbe and ZD1. Therefore, breakdown voltage of ZD1 must be lower than that of TR1.
than that of TR1.
ZD must take in consideration.
10
Energy of kick back voltage is consumed by TR1(or TR2). When ZD1 is in operation, Collector voltage is sum
Energy of kick back voltage is consumed by ZD2. To protect TR1, breakdown voltage of ZD2 must be lower
This method is generally used when Energy of kick back voltage is large. In such application, power rating of
30
5 .
10
12
3
. 1
71
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.
NJM2646
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