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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: 10/16頁
文件大小: 403K
代理商: MC33166
MC34166 MC33166
10
MOTOROLA ANALOG IC DEVICE DATA
Figure 22. Voltage–Inverting Converter
4
2
1
5
3
+
CF
RF
R2
3.3 k
R1
EA
Reference
Thermal
Oscillator
S
R
Q
PWM
UVLO
ILIMIT
Vin
12 V
Cin
330
+
2.4 k
4.7 k
0.47
Q1
+
CO
2200
VO
–12 V/1.0 A
D1
1N5822
L
190
μ
H
C1
0.047
+
+
Test
Conditions
Results
Line Regulation
Vin = 8.0 V to 24 V, IO = 1.0 A
Vin = 12 V, IO = 0.1 A to 1.0 A
Vin = 12 V, IO = 1.0 A
Vin = 12 V, RL = 0.1
Vin = 12 V, IO = 1.0 A
3.0 mV =
±
0.01%
Load Regulation
4.0 mV =
±
0.017%
Output Ripple
80 mVpp
3.74 A
Short Circuit Current
Efficiency
81.2%
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.
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 22. This keeps the emitter of Q1 positive with respect to the
ground pin and has the effect of reversing the Error Amplifier inputs. Note that the voltage drop across R1 is equal to 5.05 V when the output is in regulation.
+
+
+
+
(Top View)
Figure 23. Voltage–Inverting Converter Printed Circuit Board and Component Layout
3.0
(Bottom View)
1
M
V
Vin
VO
CO
Ci
L
CF
R
R
D
+
+
+
+
C
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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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