MC44608
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13
The Figure 19 represents a complete power supply using the secondary reconfiguration.
The specification is as follows: Input source: 85 Vac to 265 Vac
3 Outputs 112 V/0.45 A
16 V/1.5 A
8.0 V/1.0 A
Output power 80 W
Standby mode @ Pout = 300 mW, 1.3 W
Figure 18. Typical Application
+
+
+
+
22 Fm
+
I
8
7
6
5
1
2
3
4
RFI
FILTER
2N2FY
4.7 k Ω
47 k
1N4934
120 pF
MC44608P75
R10
Ω10 k
R9
Ω100 k
R8
Ω2.4 k
R12
Ω1k
C18
100 nF
m
C19
33 nF
R11
4.7 kΩ
MTP6N60E
D7
1N4148
R5
100 k Ω
C7
16 V
V
CC
R21
47 Ω
R3
0.27 Ω
OPT1
C8
100 nF
R4
3.9 k Ω
D13
1N4148
Post
Reg.
P
OFFON
ON = Normal Mode
OFF = Pulsed Mode
D14
MR856
R17
Ω2.2 k
5W
C9
470 pF
630 V
8
9
R19
Ω18 k
11
10
14
12
C16
120 pF
D10
MR852
C14
1000 m F
35 V
D9
MR852
C15
F1000 m
16 V
3
2
1
3
2
1
C17
D12
R7
Ω
C12
F47 m
250 V
C13
100 nF
D18
MR856
220 pF
500 V
C11
C20
C3
1nF
C4
1nF
D1, D2, D3, D4
1N5404
R1
Ω22 k
5W
C5
220 mF
400 V
C6
47 nF
630 V
D6
MR856
sense
6
7
1
2
FI
C1
100 nF
WIDE
MAINS
47288900
RF6
D5
1N4007
J4
J3
8V/1A
16 V/1.5 A
112 V/0.45 A
4kV
R16
MCR22--6
DZ1
DZ3
10 V
DZ2
TL431CLP
R2
Ω10
MC44608
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14
The secondary reconfiguration is activated by the mP
through the switch. The dV/dt appearing on the high voltage
winding (pins 14 of the transformer) at every TMOS switch
off, produces a current spike through the series RC network
R7, C17. According to the switch position this spike is either
absorbed by the ground (switch closed) or flows into the
thyristor gate (switch open) thus firing the MCR22--6. The
closed position of the switch corresponds to the Pulsed
Mode activation. In this secondary side SMPS status the
high voltage winding (12--14) is connected through D12 and
DZ1 to the 8.0 V low voltage secondary rail. The voltages
applied to the secondary windings 12--14, 10--11 and 6--7
(Vaux) are thus divided by ratio N12--14 / N9--8 (number of
turns of the winding 12--14 over number of turns of the
winding 9--8). In this reconfigured status all the secondary
voltages are lowered except the 8.0 V one. The regulation
during every pulsed or burst is performed by the zener diode
DZ3 which value has to be chosen higher than the normal
mode regulation level. This working mode creates a voltage
ripple on the 8.0 V rail which generally must be post
regulated for the microProcessor supply.
Figure 19. SMPS Pulsed Mode
The Figure 19 shows the SMPS behavior while working
in the reconfigured mode. The top curve represents the V
CC
voltage (pin 6 of the MC44608). The middle curve
represents the 8.0 V rail. The regulation is taking place at
11.68 V. On the bottom curve the pin 2 voltage is shown.
This voltage represents the current sense signal. The pin 2
voltage is the result of the 200 mA current source activated
during the startup phase and also during the working phase
which flows through the R4 resistor. The used high
resolution mode of the oscilloscope does not allow to show
the effective ton current flowing in the sensing resistor R11.
MC44608
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15
PACKAGE DIMENSIONS
8LEADPDIP
CASE 626--05
ISSUE M
14
58
F
NOTE 5
D
e
b
L
A1
A
E3
E
A
TOP VIEW
C
SEATING
PLANE
0.010 CA
SIDE VIEW
END VIEW
END VIEW
NOTE 3
DIM MIN NOM MAX
INCHES
A -- -- -- -- -- -- -- -- 0 . 2 1 0
A1 0 . 0 1 5 -- -- -- -- -- -- -- --
b 0.014 0.018 0.022
C 0.008 0.010 0.014
D 0.355 0.365 0.400
D1 0 . 0 0 5 -- -- -- -- -- -- -- --
e 0.100 BSC
E 0.300 0.310 0.325
L 0.115 0.130 0.150
-- -- -- -- -- -- -- -- 5 . 3 3
0 . 3 8 -- -- -- -- -- -- -- --
0.35 0.46 0.56
0.20 0.25 0.36
9.02 9.27 10.02
0 . 1 3 -- -- -- -- -- -- -- --
2.54 BSC
7.62 7.87 8.26
2.92 3.30 3.81
MIN NOM MAX
MILLIMETERS
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
2. CONTROLLING DIMENSION: INCHES.
3. DIMENSION E IS MEASURED WITH THE LEADS RE-
STRAINED PARALLEL AT WIDTH E2.
4. DIMENSION E1 DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
E1 0.240 0.250 0.280 6.10 6.35 7.11
E2
E3 -- -- -- -- -- -- -- -- 0 . 4 3 0 -- -- -- -- -- -- -- -- 1 0 . 9 2
0.300 BSC 7.62 BSC
E1
D1
M
8X
e/2
E2
c
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to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
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“Typical” parameters w hich may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
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MC44608/D
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MC44608P40

Mfr. #:
Manufacturer:
ON Semiconductor
Description:
Switching Controllers 40KHz High Voltage
Lifecycle:
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