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MC33167THG

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
MC34167, MC33167
http://onsemi.com
13
Figure 25. Triple Output Converter
4
2
1
5
3
+
V
O1
5.0 V/3.0 A
EA
Reference
Thermal
Oscillator
S
R
Q
PWM
UVLO
ILIMIT
V
in
24 V
1000
+
6.8 k
68 k0.1
1N5825
+
1000
1000
+
1000
+
MUR110
MUR110
V
O3
−12 V/200 mA
V
O2
12 V/250 mA
T1
+
+
Tests Conditions Results
Line Regulation 5.0 V
12 V
−12 V
V
in
= 15 V to 30 V, I
O1
= 3.0 A, I
O2
= 250 mA, I
O3
= 200 mA 3.0 mV = ± 0.029%
572 mV = ± 2.4%
711 mV = ± 2.9%
Load Regulation 5.0 V
12 V
−12 V
V
in
= 24 V, I
O1
= 30 mA to 3.0 A, I
O2
= 250 mA, I
O3
= 200 mA
V
in
= 24 V, I
O1
= 3.0 A, I
O2
= 100 mA to 250 mA, I
O3
= 200 mA
V
in
= 24 V, I
O1
= 3.0 A, I
O2
= 250 mA, I
O3
= 75 mA to 200 mA
1.0 mV = ± 0.009%
409 mV = ±1.5%
528 mV = ± 2.0%
Output Ripple 5.0 V
12 V
−12 V
V
in
= 24 V, I
O1
= 3.0 A, I
O2
= 250 mA, I
O3
= 200 mA 75 mV
pp
20 mV
pp
20 mV
pp
Short Circuit Current 5.0 V
12 V
−12 V
V
in
= 24 V, R
L
= 0.1 W
6.5 A
2.7 A
2.2 A
Efficiency TOTAL V
in
= 24 V, I
O1
= 3.0 A, I
O2
= 250 mA, I
O3
= 200 mA 84.2%
# TURNS
(SEC)
+
V
O(SEC)
) V
F(SEC)
ǒ
V
O(PRI)
)V
F(PRI)
#TURNS
(PRI)
Ǔ
Multiple auxiliary outputs can easily be derived by winding secondaries on the main output inductor to form a transformer. The secondarie
s
must be connected so that the energy is delivered to the auxiliary outputs when the Switch Output turns off. During the OFF time, the voltage
across the primary winding is regulated by the feedback loop, yielding a constant Volts/Turn ratio. The number of turns for any given secondar
y
voltage can be calculated by the following equation:
T1 = Primary: Coilcraft M1496−A or General Magnetics Technology GMT−0223, 42 turns of #16 AWG on Magnetics Inc. 58350−A2 core.
T1 = Secondary: V
O2
− 69 turns of #26 AWG
T1 = Secondary: V
O3
− 104 turns of #28 AWG
Heatsink = AAVID Engineering Inc. 5903B, or 5930B.
Note that the 12 V winding is stacked on top of the 5.0 V output. This reduces the number of secondary turns and improves lead regulation. For
best auxiliary regulation, the auxiliary outputs should be less than 33% of the total output power.
MC34167, MC33167
http://onsemi.com
14
V
O
+36 V/0.3 A
D
1
L
R
1
MUR415
Z
1
22
0.01
1N5825
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
6.8 k
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
= 0.3 A 266 mV = ± 0.38%
Load Regulation V
in
= −12 V, I
O
= 0.03 A to 0.3 A 7.90 mV = ±1.1%
Output Ripple V
in
= −12 V, I
O
= 0.3 A 100 mV
pp
Efficiency V
in
= −12 V, I
O
= 0.3 A 78.4%
L = General Magnetics Technology GMT−0223, 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
1N5825
+
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
MC34167, MC33167
http://onsemi.com
15
1000
T1
+ +
MC34167
Step−Down
Converter
0.001
0.001
Output 1
MBR20100CT
1000
+ +
MC34167
Step−Down
Converter
0.001
0.001
Output 2
MBR20100CT
1000
+ +
MC34167
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
= MC34167 and MJE13005 − 5903B
T
2
= MBR20100CT − 5925B
+
+
The MC34167 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
circuit self−oscillates at 50 kHz and is controlled by the saturation characteristics of T
2
. Multiple MC34167 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
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

MC33167THG

Mfr. #:
Buy MC33167THG
Manufacturer:
ON Semiconductor
Description:
Switching Voltage Regulators 40V 5A Buck/Boost/Inverting
Lifecycle:
New from this manufacturer.
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