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參數資料
| 型號： | MC33166 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 23 mm Glass Transponder R/O ECO 0-RFIDT |
| 中文描述： | 電源開關穩壓器 |
| 文件頁數： | 9/16頁 |
| 文件大小： | 403K |
| 代理商： | MC33166 |
MC34166 MC33166
9
MOTOROLA ANALOG IC DEVICE DATA
Figure 20. Step–Up/Down Converter
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
μ
H
*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
Vin = 12 V, IO = 0.1 A to 0.6 A
Vin = 12 V, IO = 0.6 A
Vin = 12 V, RL = 0.1
Vin = 12 V, IO = 0.6 A
23 mV =
±
0.41%
Load Regulation
3.0 mV =
±
0.005%
Output Ripple
100 mVpp
4.0 A
Short Circuit Current
Efficiency
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 20 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.
RG
(Top View)
(Bottom View)
3.45
″
″
1
Figure 21. Step–Up/Down Converter Printed Circuit Board and Component Layout
M
Vin
VO
CO
Ci
L
R1
D
+
–
+
–
+
+
D3
D2
Q
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| MC33166D2TR4 | 功能描述:直流/直流開關調節器 40V 3A RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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