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參數(shù)資料
型號(hào): MC34167TH
廠商: MOTOROLA INC
元件分類: 穩(wěn)壓器
英文描述: RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述: 8 A SWITCHING REGULATOR, 81 kHz SWITCHING FREQ-MAX, PSFM5
封裝: HORIZONTAL MOUNT, PLASTIC, TO-220, 5 PIN
文件頁數(shù): 8/16頁
文件大小: 408K
代理商: MC34167TH
MC34167 MC33167
8
MOTOROLA ANALOG IC DEVICE DATA
Figure 18. Step–Down Converter
4
2
1
5
3
+
CF
RF
R1
CO
4700
VO
5.05 V/5.0 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
1N5825
L
190
μ
H
+
+
+
Test
Conditions
Results
Line Regulation
Vin = 10 V to 36 V, IO = 5.0 A
Vin = 12 V, IO = 0.25 A to 5.0 A
Vin = 12 V, IO = 5.0 A
Vin = 12 V, RL = 0.1
Vin = 12 V, IO = 5.0 A
Vin = 24 V, IO = 5.0 A
4.0 mV =
±
0.039%
1.0 mV =
±
0.01%
20 mVpp
6.5 A
Load Regulation
Output Ripple
Short Circuit Current
Efficiency
78.9%
82.6%
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.
ééééé
ééééé
ééééé
ééééé
ééééé
ééé
(Top View)
Vin
VO
CO
Ci
L
CF
R1
D
+
+
+
+
Figure 19. Step–Down Converter Printed Circuit Board and Component Layout
(Bottom View)
3.0
1
M
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