- 您现在的位置：买卖IC网 > PDF目录69482 > TC7662AIJA SWITCHED CAPACITOR CONVERTER, 12 kHz SWITCHING FREQ-MAX, CDIP8 PDF资料下载
参数资料
| 型号： | TC7662AIJA |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 12 kHz SWITCHING FREQ-MAX, CDIP8 |
| 封装： | CERDIP-8 |
| 文件页数： | 12/14页 |
| 文件大小： | 458K |
| 代理商： | TC7662AIJA |
2002 Microchip Technology Inc.
DS21468B-page 7
TC7662A
4.2
Output Ripple
ESR also affects the ripple voltage seen at the output.
The total ripple is determined by 2 voltages, A and B,
as shown in Figure 4-2. Segment A is the voltage drop
across the ESR of CR at the instant it goes from being
charged by CP (current flowing into CR) to being dis-
charged through the load (current flowing out of CR).
The magnitude of this current change is 2 x IOUT, hence
the total drop is 2 x IOUT x ESRCR volts. Segment B is
the voltage change across CR during time t2, the half of
the cycle when CR supplies current to the load. The
drop at B is IOUT x t2/CR volts. The peak-to-peak ripple
voltage is the sum of these voltage drops:
FIGURE 4-2:
OUTPUT RIPPLE
4.3
Paralleling Devices
Any number of TC7662A voltage converters may be
paralleled to reduce output resistance (Figure 4-3).
The reservoir capacitor, CR, serves all devices, while
each device requires its own pump capacitor, CP. The
resultant output resistance would be approximately:
4.4
Cascading Devices
The TC7662A may be cascaded as shown (Figure 4-4)
to produce larger negative multiplication of the initial
supply voltage. However, due to the finite efficiency of
each device, the practical limit is 10 devices for light
loads. The output voltage is defined by:
VOUT = – n (VIN)
where n is an integer representing the number of
devices cascaded. The resulting output resistance
would be approximately the weighted sum of the
individual TC7662A ROUT values.
FIGURE 4-3:
PARALLELING DEVICES LOWERS OUTPUT IMPEDANCE
FIGURE 4-4:
INCREASED OUTPUT VOLTAGE BY CASCADING DEVICES
1
2 x fPUMP x CR
VRIPPLE (
+ 2 x ESRCR x IOUT)
t2
t1
B
A
V
0
-(VDD)
ROUT =
ROUT (of TC7662A)
n (number of devices)
1
2
3
4
8
7
6
5
TC7662A
VDD
1
2
3
4
8
7
6
5
TC7662A
RL
C2
C1
"n"
"1"
+
C1
1
2
3
4
8
7
6
5
VDD
1
2
3
4
8
7
6
5
10
F
10
F
"n"
"1"
10
F
V
OUT*
+
TC7662A
*VOUT = -nVDD
10
F
相关PDF资料 |
PDF描述 |
|---|---|
| TC7662AMJA | SWITCHED CAPACITOR CONVERTER, 12 kHz SWITCHING FREQ-MAX, CDIP8 |
| TC7662AIJAG | SWITCHED CAPACITOR CONVERTER, 12 kHz SWITCHING FREQ-MAX, CDIP8 |
| TC7662AMJAG | SWITCHED CAPACITOR CONVERTER, 12 kHz SWITCHING FREQ-MAX, CDIP8 |
| TC7MPB9326FK | DUAL 1-CHANNEL, SGL POLE DOUBLE THROW SWITCH, PDSO14 |
| TC7MPB9327FTG | DUAL 1-CHANNEL, SGL POLE DOUBLE THROW SWITCH, PQCC16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TC7662AMJA | 功能描述:电荷泵 High Voltage RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| TC7662B | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER |
| TC7662BC0A | 制造商:Texas Instruments 功能描述: |
| TC7662BCOA | 功能描述:电荷泵 High Voltage RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| TC7662BCOA | 制造商:Microchip Technology Inc 功能描述:DC/DC CONVERTER SMD 7662 SOIC8 |
发布紧急采购，3分钟左右您将得到回复。