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MC34166TG Datasheet(PDF) 9 Page - ON Semiconductor

Part # MC34166TG
Description  3.0 A, Step?뭊p/Down/Inverting Switching Regulators
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC34166TG Datasheet(HTML) 9 Page - ON Semiconductor

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MC34166, MC33166
http://onsemi.com
9
4
2
1
5
3
+
CF
RF
R1
CO
2200
VO
5.05 V/3.0 A
R2
EA
Reference
Thermal
Oscillator
S
R
Q
PWM
UVLO
ILIMIT
Vin
12 V
Cin
330
+
6.8 k
68 k
0.1
Q1
D1
1N5822
L
190
mH
+
+
+
Test
Conditions
Results
Line Regulation
Vin = 8.0 V to 36 V, IO = 3.0 A
5.0 mV =
± 0.05%
Load Regulation
Vin = 12 V, IO = 0.25 A to 3.0 A
2.0 mV =
± 0.02%
Output Ripple
Vin = 12 V, IO = 3.0 A
10 mVpp
Short Circuit Current
Vin = 12 V, RL = 0.1 W
4.3 A
Efficiency
Vin = 12 V, IO = 3.0 A
82.8%
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
Figure 20. Step−Down Converter Printed Circuit Board and Component Layout
(Bottom View)
(Top View)
3.0
Vin
VO
CF
RF
R1
+−
+
+
+


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