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參數(shù)資料
| 型號： | MC33166 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大小： | 403K |
| 代理商： | MC33166 |
MC34166 MC33166
8
MOTOROLA ANALOG IC DEVICE DATA
Figure 18. Step–Down Converter
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
μ
H
+
+
+
Test
Conditions
Results
Line Regulation
Vin = 8.0 V to 36 V, IO = 3.0 A
Vin = 12 V, IO = 0.25 A to 3.0 A
Vin = 12 V, IO = 3.0 A
Vin = 12 V, RL = 0.1
Vin = 12 V, IO = 3.0 A
5.0 mV =
±
0.05%
Load Regulation
2.0 mV =
±
0.02%
Output Ripple
10 mVpp
4.3 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. 5903B, or 5930B.
The Step–Down Converter application is shown in Figure 18. 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.
(Top View)
ééééé
ééééé
ééééé
ééééé
ééé
ééé
Figure 19. Step–Down Converter Printed Circuit Board and Component Layout
(Bottom View)
3.0
″
″
1
M
Vin
VO
CO
Ci
L
RF
R
R1
D
+
–
+
–
+
+
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