MC33167 View Datasheet(PDF) - ON Semiconductor
Part Name
Description
Manufacturer
MC33167 Datasheet PDF : 20 Pages
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Oscillator
PWM
MC34167, MC33167
ILIMIT
S
Q
R
UVLO
Vin
12 V
4
+ Cin
330
Q1
2
D1
1N5825
Thermal
3
Reference
+
EA
+
1
L
190 µH
R2
6.8 k CO +
4700
VO
5.05 V/5.0 A
5
CF
RF
0.1
68 k
R1
Test
Conditions
Results
Line Regulation
Load Regulation
Vin = 10 V to 36 V, IO = 5.0 A
Vin = 12 V, IO = 0.25 A to 5.0 A
4.0 mV = ± 0.039%
1.0 mV = ± 0.01%
Output Ripple
Vin = 12 V, IO = 5.0 A
20 mVpp
Short Circuit Current
Vin = 12 V, RL = 0.1 Ω
6.5 A
Efficiency
Vin = 12 V, IO = 5.0 A
Vin = 24 V, IO = 5.0 A
78.9%
82.6%
L = Coilcraft M1496–A or General Magnetics Technology GMT–0223, 42 turns of #16 AWG
on Magnetics Inc. 58350–A2 core. Heatsink = AAVID Engineering Inc. 5903B, or 5930B.
The Step–Down Converter application is shown in Figure 19. The output switch transistor Q1 interrupts the input voltage, generating a
squarewave at the LCO filter input. The filter averages the squarewaves, producing a dc output voltage that can be set to any level between
Vin and Vref by controlling the percent conduction time of Q1 to that of the total oscillator cycle time. If the converter design requires an output
voltage greater than 5.05 V, resistor R1 must be added to form a divider network at the feedback input.
Figure 19. Step–Down Converter
3.0″
(Bottom View)
+ Vin -
+
ÉÉÉÉÉÉÉÉÉÉÉÉR-FÉÉÉÉÉÉVORÉÉÉÉÉÉ+1 CFÉÉÉÉÉÉ
+
(Top View)
Figure 20. Step–Down Converter Printed Circuit Board and Component Layout
http://onsemi.com
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