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MC34166 bảng dữ liệu(PDF) 10 Page - ON Semiconductor

tên linh kiện MC34166
Giải thích chi tiết về linh kiện  3.0 A, Step?뭊p/Down/ Inverting Switching Regulators
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nhà sản xuất  ONSEMI [ON Semiconductor]
Trang chủ  http://www.onsemi.com
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MC34166 bảng dữ liệu(HTML) 10 Page - ON Semiconductor

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MC34166, MC33166
http://onsemi.com
10
4
2
1
5
3
+
CF
RF
R1
1.5 k
CO
1000
VO
28 V/0.6 A
R2
EA
Reference
Thermal
Oscillator
S
R
Q
PWM
UVLO
ILIMIT
Vin
12 V
Cin
330
+
6.8 k
4.7 k
0.47
Q1
D1
1N5822
+
*Gate resistor RG, zener diode D3, and diode D4 are required only when Vin is greater than 20 V.
L
190
mH
*RG
620
D3
1N967A
D2
1N5822
Q2
MTP3055EL
D4
1N4148
+
+
Test
Conditions
Results
Line Regulation
Vin = 8.0 V to 24 V, IO = 0.6 A
23 mV =
± 0.41%
Load Regulation
Vin = 12 V, IO = 0.1 A to 0.6 A
3.0 mV =
± 0.005%
Output Ripple
Vin = 12 V, IO = 0.6 A
100 mVpp
Short Circuit Current
Vin = 12 V, RL = 0.1 W
4.0 A
Efficiency
Vin = 12 V, IO = 0.6 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.
MC34166: 5903B, or 5930B
MTP3055EL: 5925B
Figure 21 shows that the MC34166 can be configured as a step−up/down converter with the addition of an external power MOSFET. Energy
is stored in the inductor during the on−time of transistors Q1 and Q2. During the off−time, the energy is transferred, with respect to ground, to
the output filter capacitor and load. This circuit configuration has two significant advantages over the basic step−up converter circuit. The first
advantage is that output short−circuit protection is provided by the MC34166, since Q1 is directly in series with Vin and the load. Second, the
output voltage can be programmed to be less than Vin. Notice that during the off−time, the inductor forward biases diodes D1 and D2, transferring
its energy with respect to ground rather than with respect to Vin. When operating with Vin greater than 20 V, a gate protection network is required
for the MOSFET. The network consists of components RG, D3, and D4.
Figure 21. Step−Up/Down Converter
(Top View)
(Bottom View)
3.45
Figure 22. Step−Up/Down Converter Printed Circuit Board and Component Layout
Vin
VO
CF
RF
R1
+−
+
+
+
D3
D2
RG


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