MC33166T ON Semiconductor, MC33166T Datasheet - Page 9

• Manufacturer Part Number: MC33166T
• Description: IC REG SWITCH INVERT 3A TO220-5
• Manufacturer: ON Semiconductor
• Type: Step-Down (Buck), Step-Up (Boost), Invertingr

Specifications of MC33166T

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.25 ~ 40 V
• Current - Output: 3A
• Frequency - Switching: 72kHz
• Voltage - Input: 7.5 ~ 40 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: TO-220-5 (Straight Leads)
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: MC33166TOS

The Step−Down Converter application is shown in Figure 19. The output switch transistor Q
squarewave at the LC
V
voltage greater than 5.05 V, resistor R
in
and V
ref
by controlling the percent conduction time of Q
+
Figure 20. Step−Down Converter Printed Circuit Board and Component Layout
O
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.
filter input. The filter averages the squarewaves, producing a dc output voltage that can be set to any level between
(Bottom View)
Line Regulation
Load Regulation
Output Ripple
Short Circuit Current
Efficiency
PWM
3.0″
Oscillator
3
Test
1
must be added to form a divider network at the feedback input.
Thermal
Figure 19. Step−Down Converter
V
V
V
V
V
in
in
in
in
in
MC34166, MC33166
= 8.0 V to 36 V, I
= 12 V, I
= 12 V, I
= 12 V, R
= 12 V, I
1
http://onsemi.com
to that of the total oscillator cycle time. If the converter design requires an output
S
R
5
Conditions
Q
+
O
O
O
L
= 0.25 A to 3.0 A
= 3.0 A
= 3.0 A
= 0.1 W
9
ILIMIT
UVLO
Reference
C
0.1
O
F
= 3.0 A
EA
+
68 k
V in
R
+
F
Q
+
−
1
5.0 mV = ± 0.05%
2.0 mV = ± 0.02%
10 mV
4.3 A
82.8%
4
2
1
É É É É É
É É É É É
É É É É É
É É É É É
É É É É É
+
12 V
1
V
É É É
pp
in
Results
interrupts the input voltage, generating a
R
C
330
RF
D
1N5822
−
6.8 k
1
in
R
1
2
V O
(Top View)
R1
+
2200
C
O
C F
+
190 mH
L
5.05 V/3.0 A
+
V
O