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參數(shù)資料
| 型號(hào)： | TC1227EUA |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Inverting Dual (-VIN, -2VIN) Charge Pump Voltage Converters |
| 中文描述： | 反相雙（- VIN，這- 2VIN）電荷泵電壓轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 5/10頁(yè) |
| 文件大?。?/td> | 1194K |
| 代理商： | TC1227EUA |
5
TC1225
TC1226
TC1227
TC1225/6/7-1 3/24/00
Inverting Dual (
–
V
IN
,
–
2V
IN
)
Charge Pump Voltage Converters
2001 Microchip Technology Inc. DS21369A
Dual Voltage Inverter
The most common application for the TC1225/1226/
1227 devices is the dual voltage inverter (Figure 2). This
application uses four external capacitors: C1, C2, C
OUT1
,
and C
OUT2
(NOTE: a power supply bypass capacitor is
recommended). The outputs are equal to – V
IN
and –2VIN
plus any voltage drops due to loading. Refer to Tables 1a,
1b, 2a, and 2b for capacitor selection guidelines.
Figure 2. Dual Voltage Inverter Test Circuit
Layout Considerations
As with any switching power supply circuit good layout
practice is recommended. Mount components as close
together as possible to minimize stray inductance and
capacitance. Also use a large ground plane to minimize
noise leakage into other circuitry.
TC1225 DEMO CARD
The TC1225 DEMO Card is a 2.0” x 2.0” card containing
both a TC1225 and two cascaded TCM828s that allow the
user to compare the operation of each approach for gener-
ating a –1X and –2X function. Each circuit is fully assembled
with the required external capacitors along with variable
load resistors that allow the user to vary the output load
current of each stage. For convenience, several test points
and jumpers are available for measuring various voltages
and currents on the demo board.
Figure 3 is a schematic of the TC1225 DEMO Card, and
Figure 4 shows the assembly drawing and artwork for the
board. Table 3 lists the voltages that are monitored by the
test points and Table 4 lists the currents that can be
measured using the jumpers.
Table 3. TC1225 DEMO Card Test Points
TEST POINT
VOLTAGE MEASUREMENT
TP1
TP2
TP3
TP4
TP5
TP6
TP7
VIN [+5V]
GROUND
GROUND
TCM828 U1 OUTPUT [-5V(1)]
TCM828 U2 OUTPUT [-10V(1)]
TC1225 STAGE 1 OUTPUT [-5V(2)]
TC1225 STAGE 2 OUTPUT [-10V(2)]
Table 4. TC1225 DEMO Card Jumpers
JUMPER
CURRENT MEASUREMNT
J1
J2
J3
J4
J5
J6
DUAL TCM828 QUIESCENT CURRENT
TC1225 QUIESCENT CURRENT
TCM828 U1 [-5V(1)] LOAD CURRENT
TCM828 U2 [-10V(1)] LOAD CURRENT
TC1225 STAGE 1 [-5V(2)] LOAD CURRENT
TC1225 STAGE 2 [-10V(2)] LOAD CURRENT
C1
C2
V
IN
C
IN
R
L1
V
OUT1
V
OUT2
R
L2
–
V
IN
V
IN
C
OUT1
C
OUT2
–
2V
IN
TC1225
TC1226
TC1227
C1
–
C2
–
2
1
7
6
8
4
5
3
C1+
C2+
GND
Device
TC1225 3.3
μ
F 3.3
μ
F 1
μ
F 3.3
μ
F
TC1226 1
μ
F 1
μ
F 0.33
μ
F
TC1227 0.33
μ
F 0.33
μ
F 0.1
μ
F 0.33
μ
F
C
IN
C1
C2 C
OUT1
C
OUT2
1
μ
F
1
μ
F 0.33
μ
F
0.1
μ
F
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