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參數(shù)資料
| 型號： | MC33128D |
| 廠商： | MOTOROLA INC |
| 元件分類： | 電源管理 |
| 英文描述： | POWER MANAGEMENT CONTROLLER |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | PLASTIC, SO-16 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 173K |
| 代理商： | MC33128D |
MC33128
7
MOTOROLA ANALOG IC DEVICE DATA
Oscillator
VBB Generator
3
2
16
0.22
33
Vbat
VBB
5
7
8
4
4.7
Figure 6. Voltage Tripler and Switch Driver
4.7
0.1
Vbat
Tripler
Output
ON/OFF
Controlled
Turn ON/OFF
Time
R
C1
C2
RFB
RL
Load Current
(mA)
VCC = 3.15 V
VCC = 4.5 V
Tripler Output Voltage
0
0.5
1.0
1.5
2.0
7.96
7.48
7.24
6.99
6.62
12.01
11.54
11.29
11.04
10.69
Load Turn ON/OFF Time
High RFB
Critical RFB
Low RFB
External Switch
A low threshold N–channel MOSFET can be used to
switch the transmitting power amplifier (RL) ON and OFF. To
ensure that all of the available battery voltage appears
across the load, the MOSFET must be fully enhanced over
the system’s required operating voltage range. With the
addition of two Schottky diodes and two capacitors, the VBB
Generator can be made to function as a voltage tripler. The
table in Figure 6 shows the output voltage characteristics of
the tripler circuit.
In order to minimize adjacent channel splatter, the RF
power amplifier must be turned ON and OFF in a controlled
(soft) manner. The applied voltage rise and fall time, as well
as the rate of change in rise and fall time, must be tailored to
the amplifiers characteristics. The circuit consisting of
resistors R, RFB, and capacitors C1 and C2 is a simple
solution allowing the system designer a means to control the
ON and OFF time as well as the waveshape. Feedback
resistor RFB controls the waveshape. Capacitors C1
and C2
are usually of equal value.
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC33129 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High Performance Current Mode Controllers |
| MC33129D | 制造商:Motorola Inc 功能描述: |
| MC33129DR2 | 制造商: 功能描述: 制造商:undefined 功能描述: |
| MC33129EFR2 | 功能描述:IC REG CTRLR FLYBK ISO CM 14SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| MC33129P | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High Performance Current Mode Controllers |
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