- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄220082 > TC1225EUATR 0.01 A SWITCHED CAPACITOR CONVERTER, 15.6 kHz SWITCHING FREQ-MAX, PDSO8 PDF資料下載
參數(shù)資料
| 型號： | TC1225EUATR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.01 A SWITCHED CAPACITOR CONVERTER, 15.6 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 4/9頁 |
| 文件大?。?/td> | 1272K |
| 代理商： | TC1225EUATR |
4
Inverting Dual (–VIN, –2VIN)
Charge Pump Voltage
Converters
TC1225
TC1226
TC1227
TC1225/6/7-1 3/24/00
The internal switch resistance for the first stage (i.e.
RSWITCH1) is approximately 3 and the switch resistance for
the second stage (i.e. RSWITCH2) is approximately 7.
The losses in the circuit due to factor (4) above are also
shown in Equation 2a for stage 1 and Equation 2b for stage
2. The output voltage ripple for stage 1 is given by Equation
3a and the output voltage ripple for stage 2 is given by
Equation 3b.
PLOSS1 (4) = [ (0.5)(C1)(VIN
2 – VOUT12 ) + (0.5)
(COUT1) (VRIPPLE1
2 - 2VOUT1 VRIPPLE1) ] x fOSC
Equation 2a.
PLOSS2 (4) = [ (0.5) (C2) (VIN
2 – VOUT22 ) + (0.5)
(COUT2) (VRIPPLE2
2 - 2VOUT2 VRIPPLE2) ] x fOSC
Equation 2b.
VRIPPLE1 = [ IOUT1 / (fOSC) (COUT1) ] + 2 (IOUT1)
(ESRCOUT1)
Equation 3a.
VRIPPLE2 = [ IOUT2 / (fOSC) (COUT2) ] + 2 (IOUT2)
(ESRCOUT2)
Equation 3b.
Capacitor Selection
In order to maintain the lowest output resistance and
output ripple voltage, it is recommended that low ESR
capacitors be used. Additionally, larger values of C1 and C2
will lower the output resistance and larger values of COUT1
and COUT2 will reduce output ripple. (See Equations 1a, 1b,
3a, and 3b). NOTE: For proper charge pump operation,
C1 and COUT1 must have a voltage rating greater than or
equal to VIN, while C2 and COUT2 must have a voltage
rating greater than or equal to 2VIN.
Table 1a shows various values of C1 and the corre-
sponding output resistance values for VIN=5V @ +25°C for
stage 1 and Table 1b shows various values of C2 and the
corresponding output resistance values for VIN=5V @ +25°C
for stage 2. It assumes a 0.1
ESRC1, a 0.1 ESRC2, a 3
RSWITCH1, and a 7 RSWITCH2.
Table 2a shows the output voltage ripple for various
values of COUT1 and Table 2b shows the output voltage
ripple for various values of COUT2 (again assuming VIN=5V
@ +25
oC). The V
RIPPLE1 values assume a 3mA output load
current for stage 1 and a 0.1
ESRCOUT1. The VRIPPLE2
values assume a 200uA output load current for stage 2 and
a 0.1
ESRCOUT1.
Input Supply Bypassing
TheVIN input should be capacitively bypassed to reduce
AC impedance and minimize noise effects due to the switch-
ing internal to the device. It is recommended that a large
value capacitor (at least equal to C1) be connected from VIN
to GND for optimal circuit performance.
Table 1a. Output Resistance vs. C1 (ESR = 0.1
). For Stage 1
C1 (
F) TC1225 R
OUT (
) TC1226 R
OUT (
) TC1227 R
OUT (
)
0.47
202
85
42
1
108
53
33
3.3
50
33
27
Table 1b. Output Resistance vs. C2 (ESR = 0.1
). For Stage 2
C2 (
F) TC1225 ROUT () TC1226 ROUT () TC1227 ROUT ()
0.1
890
342
137
0.47
239
117
74
1
140
85
65
Table 2a. Output Voltage Ripple vs. COUT1 (ESR = 0.1) For Stage 1
(IOUT1 = 3mA)
COUT1
TC1225 VRIPPLE1
TC1226 VRIPPLE1
TC1227 VRIPPLE1
(
F)
(mV)
0.47
533
183
52
1
251
86
25
3.3
76
27
8
Table 2b. Output Voltage Ripple vs. COUT2 (ESR = 0.1) For Stage 2
(IOUT2 = 200
A)
COUT2
TC1225 VRIPPLE2
TC1226 VRIPPLE2
TC1227 VRIPPLE2
(
F)
(mV)
0.1
167
57
16
0.47
36
12
3.4
1
17
5.8
1.6
相關PDF資料 |
PDF描述 |
|---|---|
| TPS62101D | 1.6 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, PDSO8 |
| TC110301ECTTR | 0.1 A SWITCHING CONTROLLER, 115 kHz SWITCHING FREQ-MAX, PDSO5 |
| TC110503ECTTR | 0.1 A SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO5 |
| TC1304-1H0EMF | 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10 |
| TC1304-1J2EUNTR | 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TC1226 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Inverting Dual (-VIN, -2VIN) Charge Pump Voltage Converters |
| TC1226EUA | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Inverting Dual (-VIN, -2VIN) Charge Pump Voltage Converters |
| TC1227 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Inverting Dual (-VIN, -2VIN) Charge Pump Voltage Converters |
| TC1227EUA | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Inverting Dual (-VIN, -2VIN) Charge Pump Voltage Converters |
| TC122A | 制造商:Thomas & Betts 功能描述:Fittings Connector 0.75inch Steel |
發(fā)布緊急采購，3分鐘左右您將得到回復。