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參數(shù)資料
| 型號： | TC2684EUART |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 170 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 4/7頁 |
| 文件大?。?/td> | 710K |
| 代理商： | TC2684EUART |
4
TC2682
TC2683
TC2684
Inverting Charge Pump
Voltage Doublers
TC2682/3/4-1 8/14/00
2001 Microchip Technology Inc.
DS21548A
TC2682 DEMO Card
The TC2682 DEMO Card is a 2.0” x 2.0” card containing
both a TC2682 and a TC682 that allow the user to compare
the operation of each approach for generating a –2X func-
tion.
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 avail-
able for measuring various voltages and currents on the
demo board.
Figure 3 is a schematic of the TC2682 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.
Input Supply Bypassing
TheVIN input should be capacitively bypassed to reduce
AC impedance and minimize noise effects due to the inter-
nal switching in 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.
Inverting Voltage Doubler
The most common application for the TC2682/2683/
2684 devices is the inverting voltage doubler (Figure 2).
This application uses three external capacitors: C1, C2, and
COUT (NOTE: a power supply bypass capacitor is recom-
mended). The output is equal to –2VIN plus any voltage
drops due to loading. Refer to Tables 1 and 2 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.
Device
CIN
C1
C2
COUT
TC2682
3.3
F 3.3F
3.3
F
3.3
F
TC2683
1
F
1
F1F
1
F
TC2684
0.33
F 0.33F 0.33F 0.33F
Table 3. TC2682 DEMO Card Test Points
TEST POINT
VOLTAGE MEASUREMENT
TP1
VIN [+1.8V TO +5V]
TP2
GROUND
TP3
GROUND
TP4
TC682 (U1) SUPPLY VOLTAGE
TP5
TC682 (U1) OUTPUT VOLTAGE [VOUT1]
TP6
TC2682 (U2) SUPPLY VOLTAGE
TP7
TC2682 (U2) OUTPUT VOLTAGE [VOUT2]
Table 4. TC2682 DEMO Card Jumpers
JUMPER
CURRENT MEASUREMNT
J1
TC682 (U1) QUIESCENT CURRENT
J2
TC2682 (U2) QUIESCENT CURRENT
J3
TC682 (U1) VOUT1 LOAD CURRENT
J4
TC2682 (U2) VOUT2 LOAD CURRENT
C1
C2
V
IN
C
IN
V
OUT
R
L
V
IN
C
OUT
V
OUT
TC2682
TC2683
TC2684
C1–
C2–
2
1
7
6
4
5
3
C1+
C2+
GND
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