G642x-A

Document 140-1
Mag Amp Toroids – G642X Series
This product is not RoHS-compliant. Contact Coilcraft
for current status or possible alternatives.
These low cost saturable reactor (mag amp) coils are
designed to regulate switching power supplies operating
at frequencies from 20 kHz to over 100 kHz.
In multi-output circuits requiring tight crossregulation, mag
amp control is simple and more cost-effective than adding conventional linear voltage regulators to each output.
Mag amps are also particularly advantageous where load
current exceeds 1 or 2 amps, because of their efficiency
and low heat dissipation.
Coilcraft Designer’s Kit No. P206 contains samples of
all values shown. To order, please contact Coilcraft or visit
http://order.coilcraft.com.
Advantages
• Higher efficiency than linear regulators, especially at higher currents
• Simple cross-regulation of multi-output supplies
• Lower EMI
• Frequency range of 20 kHz to over 100 kHz
• Standardized construction for maximum economy
Electrical Specifications
Current1
Volt-time product
(typical)
Weight (g)
G6421-AG6422-AG6423-AG6424-AG6425-AG6426-A
1 A
93 v-µsec
1 A
133 v-µsec
1 A
372 v-µsec
5 A
42 v-µsec
5 A
66 v-µsec
5A
186 v-µsec
4.4
5.5
9.6
5.2
6.6
12.8
1. Based on 40°C maximum temperature rise.
2. Operating temperature range –40°C to +85°C.
3. Electrical specifications at 25°C.
US +1-847-639-6400 [email protected]
UK +44-1236-730595 [email protected]
Taiwan +886-2-2264 3646 [email protected]
China +86-21-6218 8074 [email protected]
Singapore + 65-6484 8412 [email protected]
Document 140-1 Revised 03/22/12
© Coilcraft Inc. 2012
This product may not be used in medical of high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check out web site for latest information.
Document 140-2
Mag Amp Toroids - G642X Series
Dimensions
Parts manufactured prior
to February, 2012 may be
marked differently.
1
Part number
G642x-A
A
Internal code
CC-3Y
XXXX
4
1
2
+0.025
0.600 ±0.010
15,24 ±0,254
2
0.150 –0.010
B
+0,635
0.040 ±0.003
dia
1,02 ±0,08
3,81 –0,254
Part
number
1
G6421-A
G6422-A
G6423-A
G6424-A
G6425-A
G6426-A
2
0.250 ±0.010
6,35 ±0,254
4
2
NC
4
A max
B max
0.85/21,59
1.00/25,40
1.25/31,75
0.90/22,86
1.05/26,67
1.30/33,02
C max
0.65/16,510.825/20,96
0.65/16,510.825/20,96
0.65/16,511.150/29,21
0.55/13,970.825/20,96
0.55/13,970.825/20,96
0.55/13,971.150/29,21
C
Test Circuit
The test circuit below can be used to test the volt-time
product supported by each of the mag amp coils.
square wave. (Actually the current square wave is not flat
but gradually increases due to the magnetizing current.)
Apply the square wave to the coil and observe the current
waveform (voltage across the series resistor). Increase the
applied voltage until a spike appears at the end of each
half cycle, indicating core saturation.
To record the volt-time product, multiply the applied peak
voltage by the time required to reach saturation and divide
by two.
Saturation is defined as the point at which the magnitude
of the spike has become twice the peak value of the
The series resistor should be as small as possible, without loading the square wave supply. If the square wave
generator is powerful enough, the differential amp may
not be necessary.
+
+
Square Wave
Generator
Differential
Amplifier
V Applied
Inductor
under
test
–
RS
Scope
+
V Applied
0
–
US +1-847-639-6400 [email protected]
UK +44-1236-730595 [email protected]
Taiwan +886-2-2264 3646 [email protected]
China +86-21-6218 8074 [email protected]
Singapore + 65-6484 8412 [email protected]
Vr
(Scope)
t
0
v
2v
t
–
Document 140-2 Revised 03/22/12
© Coilcraft Inc. 2012
This product may not be used in medical of high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check out web site for latest information.