MC34167, MC33167 5.0 A, Step−Up/Down/ Inverting ... - RFPhone

MC34167, MC33167
+
ILIMIT
4
PWM
Oscillator
Thermal
S
R
Q
+
UVLO
Reference
EA
Q 1
+
2
1
22
0.01
1N5825
D 1
Z 1
R 1
VO R 1 5.05
R2 0.7
L
MUR415
MTP
3055E
2N3906
V O
+36 V/0.3 A
+
1000
R 1
36 k
6.8 k
V in
−12 V
3
+
1000
5
0.22 470 k
0.002
R 2
5.1 k
*Gate resistor R G , zener diode D 3 , and diode D 4 are required only when V in is greater than 20 V.
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 A WG on Magnetics Inc.
58350−A2 core. Heatsink = AAVID Engineering Inc. 5903B or 5930B
Figure 26. Negative Input/Positive Output Regulator
+
PWM
Oscillator
S
R
Q
ILIMIT
UVLO
4
2
+
V in
18 V
1000
1N5825
Thermal
+
Reference
Brush
Motor
EA
+
1
5.6 k
+
1.0 k
47
50 k
Faster
3
5
0.1
56 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
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