MC33166T ON Semiconductor, MC33166T Datasheet - Page 11
![IC REG SWITCH INVERT 3A TO220-5](/photos/36/39/363974/to220-5_sml.jpg)
MC33166T
Manufacturer Part Number
MC33166T
Description
IC REG SWITCH INVERT 3A TO220-5
Manufacturer
ON Semiconductor
Type
Step-Down (Buck), Step-Up (Boost), Invertingr
Datasheet
1.MC34166TG.pdf
(18 pages)
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
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Company
Part Number
Manufacturer
Quantity
Price
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Two potential problems arise when designing the standard voltage−inverting converter with the MC34166. First, the Switch Output emitter is
limited to −1.5 V with respect to the ground pin and second, the Error Amplifier’s noninverting input is internally committed to the reference and
is not pinned out. Both of these problems are resolved by connecting the IC ground pin to the converter’s negative output as shown in Figure 23.
This keeps the emitter of Q
drop across R
1
is equal to 5.05 V when the output is in regulation.
Figure 24. Voltage−Inverting Converter Printed Circuit Board and Component Layout
+
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.
(Bottom View)
Line Regulation
Load Regulation
Output Ripple
Short Circuit Current
Efficiency
1
PWM
positive with respect to the ground pin and has the effect of reversing the Error Amplifier inputs. Note that the voltage
3.0″
Oscillator
3
Test
Thermal
Figure 23. Voltage−Inverting Converter
V
V
V
V
V
in
in
in
in
in
MC34166, MC33166
= 8.0 V to 24 V, I
= 12 V, I
= 12 V, I
= 12 V, R
= 12 V, I
http://onsemi.com
S
R
5
Conditions
Q
O
O
+
O
L
= 0.1 A to 1.0 A
= 1.0 A
= 1.0 A
= 0.1 W
11
ILIMIT
UVLO
Reference
0.47
C
O
F
= 1.0 A
EA
+
+
+
+
+
+
+
V in
4.7 k
+
R
F
Q
−
+
1
3.0 mV = ± 0.01%
4.0 mV = ± 0.017%
80 mV
3.74 A
81.2%
3.3 k
Î Î Î Î Î
Î Î Î Î Î
Î Î Î Î Î
Î Î Î Î Î
Î Î Î Î Î
4
2
1
R
2
+
12 V
Î Î Î
V
pp
Results
in
RF
−
330
C
2.4 k
190 mH
R
0.047
in
V O
C
1
L
(Top View)
1
+
1N5822
C F
D
1
+
2200
C
−12 V/1.0 A
O
+
V
O
+
+
+
+
+
+