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參數(shù)資料
| 型號(hào)： | TCM853COA |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 120 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 57K |
| 代理商： | TCM853COA |
4
5V TO
±10V VOLTAGE CONVERTER
+B122+B124 REGULATED GaAs
FET BIAS SUPPLY
TCM850
TCM851
TCM852
TCM853
TC850/1/2/3-3 10/1/96
2001 Microchip Technology Inc.
DS21489A
The relationship between output voltage and control
voltage for the TCM853 (Figure 5) is given by:
VOUT = VCTRL (–1.28)
(
R2
R1
)
Figure 4. TCM850/851/852 Adjustable Application
NEGOUT
FB
OUT
VIN
All caps = 1.0
F unless otherwise noted
TCM850
TCM851
TCM852
C1
C3
C2
GND
C1
+
C1
–
SHDN
OSC
VOUT = –2.56V
R2 = 100k
R1 = 100k
IOUT
C4
10
F
Figure 5. TCM853 Standard Application Circuit
DETAILED DEVICE DESCRIPTION
The voltage applied to VIN is inverted by a capacitive
charge pump (using commutating capacitor C1 and reser-
voir capacitor C2). The negative voltage at NEGOUT is then
regulated by an internal linear regulator, the output of which
is connected to the OUT pin (Figure 1). The most negative
output voltage possible is the inverted input voltage (i.e.
–VIN) plus 1.0V (required by the post regulator). The linear
regulator reduces combined output noise (charge pump
ripple plus incoming supply noise) to 2mVp-p for the TCM850/
1/2 and 1mVp-p for the TCM853.
APPLICATIONS INFORMATION
Setting the Output Voltage
The TCM850/1/2 operate in the fixed output voltage
mode (OUT = – 4.1V) when the FB input is grounded (Figure
3). The output voltage can be adjusted by connecting FB to
the midpoint of a resistive voltage divider from OUT to GND
(Figure 4). Care must be taken to allow a minimum of 1.0V
across the linear regulator for proper regulation. The output
voltage is calculated using the formula below (R2 should be
chosen to be between 100k
and 400k):
VOUT = (–1.28)
(1+
R2
R1
)
NEGOUT
FB
OUT
VIN
VOUT = –4.1V
All caps = 1.0
F unless otherwise noted
IOUT
TCM850
TCM851
TCM852
C1
C3
C2
C4
10
F
GND
C1
+
C1
–
SHDN
OSC
Figure 3. TCM850/851/852 Standard Application
NEGOUT
CONT
OUT
VIN
VOUT = – 0.5V to – 9.0V
VCTRL (0 to 10V)
All caps = 1.0
F unless otherwise noted
R2 = 100k
R1 = 100k
IOUT
TCM853
C1
C3
C2
C4
10
F
GND
C1
+
C1
–
SHDN
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