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MC33166TVG

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
MC34166, MC33166
http://onsemi.com
13
V
O
+36 V/0.25 A
D
1
L
R
1
MUR415
Z
1
22
0.01
1N5822
MTP
3055E
2N3906
R
1
36 k
R
2
5.1 k
+
1000
V
O
+
ǒ

R
1
R
2
Ǔ
)
4
2
1
5
3
+
0.22 470 k
EA
Reference
Thermal
Oscillator
S
R
Q
PWM
UVLO
ILIMIT
Q
1
*Gate resistor R
G
, zener diode D
3
, and diode D
4
are required only when V
in
is greater than 20 V.
V
in
−12 V
1000
+
0.002
5.05 0.7
+
+
Test Conditions Results
Line Regulation V
in
= −10 V to − 20 V, I
O
= 0.25 A 250 mV = ± 0.35%
Load Regulation V
in
= −12 V, I
O
= 0.025 A to 0.25 A 790 mV = ±1.19%
Output Ripple V
in
= −12 V, I
O
= 0.25 A 80 mV
pp
Efficiency V
in
= −12 V, I
O
= 0.25 A 79.2%
L = Coilcraft M1496−A or ELMACO CHK1050, 42 turns of #16 AWG on Magnetics Inc.
58350−A2 core.
Heatsink = AAVID Engineering Inc. 5903B or 5930B
Figure 26. Negative Input/Positive Output Regulator
47
+
50 k
Faster
Brush
Motor
4
2
1
5
3
+
EA
Reference
Thermal
Oscillator
S
R
Q
PWM
UVLO
ILIMIT
V
in
18 V
1000
5.6 k
56 k0.1
1N5822
+
1.0 k
+
+
Test Conditions Results
Low Speed Line Regulation V
in
= 12 V to 24 V 1760 RPM ±1%
High Speed Line Regulation V
in
= 12 V to 24 V 3260 RPM ± 6%
Figure 27. Variable Motor Speed Control with EMF Feedback Sensing
MC34166, MC33166
http://onsemi.com
14
1000
T1
+ +
MC34166
Step−Down
Converter
0.001
0.001
Output 1
MBR20100CT
1000
+ +
MC34166
Step−Down
Converter
0.001
0.001
Output 2
MBR20100CT
1000
+ +
MC34166
Step−Down
Converter
0.001
0.001
Output 3
MBR20100CT
0.01
RFI
Filter
100
3.3
1N4003
MJE13005
220
0.047
1N4937
50
100k
T
2
1N5404
115 VAC
T
1
= Core and Bobbin − Coilcraft PT3595
T
1
= Primary − 104 turns #26 AWG
T
1
= Base Drive − 3 turns #26 AWG
T
1
= Secondaries − 16 turns #16 AWG
T
1
= Total Gap − 0.002″
T
2
= Core − TDK T6 x 1.5 x 3 H5C2
T
2
= 14 turns center tapped #30 AWG
T
2
= Heatsink = AAVID Engineering Inc.
T
2
= MC34166 and MJE13005 − 5903B
T
2
= MBR20100CT − 5925B
+
+
The MC34166 can be used cost effectively in off−line applications even though it is limited to a maximum input voltage of 40 V. Figure 28 shows
a simple and efficient method for converting the AC line voltage down to 24 V. This preconverter has a total power rating of 125 W with a conversion
efficiency of 90%. Transformer T
1
provides output isolation from the AC line and isolation between each of the secondaries. The circui
t
self−oscillates at 50 kHz and is controlled by the saturation characteristics of T
2
. Multiple MC34166 post regulators can be used to provide
accurate independently regulated outputs for a distributed power system.
Figure 28. Off−Line Preconverter
R , THERMAL RESISTANCE
JAθ
JUNCTION-TO-AIR ( C/W)°
30
40
50
60
70
80
1.0
1.5
2.0
2.5
3.0
3.5
010203025155.0
L, LENGTH OF COPPER (mm)
P
D(max)
for T
A
= +50°C
Minimum
Size Pad
2.0 oz. Copper
L
L
Free Air
Mounted
Vertically
P
D
, MAXIMUM POWER DISSIPATION (W)
R
q
JA
Figure 29. D
2
PAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
MC34166, MC33166
http://onsemi.com
15
Table 1. Design Equations
Calculation Step−Down Step−Up/Down Voltage−Inverting
t
on
t
off
(Notes 1, 2)
V
out
) V
F
V
in
* V
sat
* V
out
V
out
) V
F1
) V
F2
V
in
* V
satQ1
* V
satQ2
|V
out
| ) V
F
V
in
* V
sat
t
on
t
on
t
off
f
osc
ǒ
t
on
t
off
) 1
Ǔ
t
on
t
off
f
osc
ǒ
t
on
t
off
) 1
Ǔ
t
on
t
off
f
osc
ǒ
t
on
t
off
) 1
Ǔ
Duty Cycle
(Note 3)
t
on
f
osc
t
on
f
osc
t
on
f
osc
I
L
avg
I
out
I
out
ǒ
t
on
t
off
) 1
Ǔ
I
out
ǒ
t
on
t
off
) 1
Ǔ
I
pk(switch)
I
Lavg
)
DI
L
2
I
Lavg
)
DI
L
2
I
Lavg
)
DI
L
2
L
ǒ
V
in
* V
sat
* V
out
DI
L
Ǔ
t
on
ǒ
V
in
* V
satQ1
* V
satQ2
DI
L
Ǔ
t
on
ǒ
V
in
* V
sat
DI
L
Ǔ
t
on
V
ripple(pp)
DI
L
ǒ
1
8f
osc
C
o
Ǔ
2
) (ESR)
2
Ǹ
ǒ
t
on
t
off
) 1
Ǔǒ
1
f
osc
C
o
Ǔ
2
) (ESR)
2
Ǹ
ǒ
t
on
t
off
) 1
Ǔǒ
1
f
osc
C
o
Ǔ
2
) (ESR)
2
Ǹ
V
out
V
ref
ǒ
R
2
R
1
) 1
Ǔ
V
ref
ǒ
R
2
R
1
) 1
Ǔ
V
ref
ǒ
R
2
R
1
) 1
Ǔ
1. V
sat
− Switch Output source saturation voltage, refer to Figure 8.
2. V
F
− Output rectifier forward voltage drop. Typical value for 1N5822 Schottky barrier rectifier is 0.5 V.
3. Duty cycle is calculated at the minimum operating input voltage and must not exceed the guaranteed minimum DC
(max)
specification of 0.92.
V
out
−
I
out
−
DI
L
−
V
ripple(pp)
−
Desired output voltage.
Desired output current.
Desired peak−to−peak inductor ripple current. For maximum output current especially when the duty cycle is greater than
0.5, it is suggested that DI
L
be chosen to be less than 10% of the average inductor current I
L
avg
. This will help prevent
I
pk(switch)
from reaching the guaranteed minimum current limit threshold of 3.3 A. If the design goal is to use a minimum
inductance value, let DI
L
= 2 (I
L
avg
). This will proportionally reduce the converter’s output current capability.
Desired peak−to−peak output ripple voltage. For best performance, the ripple voltage should be kept to less than 2% of V
ou
t
.
Capacitor C
O
should be a low equivalent series resistance (ESR) electrolytic designed for switching regulator applications.
The following converter characteristics must be chosen:
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

MC33166TVG

Mfr. #:
Buy MC33166TVG
Manufacturer:
ON Semiconductor
Description:
Switching Voltage Regulators 40V 3A Buck/Boost/Inverting
Lifecycle:
New from this manufacturer.
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