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PDF TK75018MCTL Data sheet ( Hoja de datos )
| Número de pieza | TK75018MCTL | |
| Descripción | SWITCHED CAPACITOR VOLTAGE CONVERTER WITH REGULATOR | |
| Fabricantes | TOKO | |
| Logotipo |  |
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TK75018
FEATURES
s 35 mA (typ.) Output Current
s Operating Range 3.5 to 7 V
s Reference and Error Amplifier for Regulation
s External Shutdown
s External Oscillator Synch
SWITCHED CAPACITOR VOLTAGE
CONVERTER WITH REGULATOR
APPLICATIONS
s Voltage Inverter
s Negative Voltage Doubler
s Voltage Regulator
s Positive Voltage Doubler
TK75018
FB/SD
CAP +
V+
OSC
DESCRIPTION
The TK75018 is a monolithic switched capacitor converter
with feedback control. With just two capacitors, the TK75018
can create a negative voltage supply which tracks a
positive supply. As an alternative, the feedback pin can be
used to establish regulation at a desired voltage, and it can
also be used as a shutdown signal input. A single TK75018
can also be configured as a non-inverting step-up converter
or dual output voltage doubler.
With no external timing elements, the converter will self-
oscillate at 25 kHz, nominal. This frequency can also be
user adjusted with a small capacitor or synchronized to
another oscillator.
Quiescent current is typically 2.5 mA. Standby current is
guaranteed less than 200 µA over the full operating
temperature and input voltage ranges.
GND
CAP -
FB/SD
CAP +
GND
CAP -
FB/SD
NC
CAP+
GND
NC
CAP-
NC
Vref
VOUT
V+
OSC
Vref
VOUT
V+
NC
OSC
Vref
NC
NC
VOUT
ORDERING INFORMATION
TK75018 C
Package Code
Tape/Reel Code
Temp. Range
PACKAGE CODE
D: DIP-8
M: SOP-8
V: TSSOP-14
TEMPERATURE RANGE
C: -20 TO 80 °C
TAPE/REEL CODE
TL: Tape Left
V+
Vref
FB/SD
BLOCK DIAGRAM
BANDGAP
REFERENCE
1.25 V
+
-
DRIVE
DRIVE
OSC
GND
OSC
CONTROL
Q
Q
DRIVE
DRIVE
CAP +
VOUT
CAP -
May 1999 TOKO, Inc.
Page 1
1 page  
TK75018
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
OUTPUT VOLTAGE LOSS VS.
OSCILLATOR FREQUENCY
INVERTER CONFIGURATION
2.0 CIN = 2.2 µF TANTALUM
COUT = 33 µF TANTALUM
OUTPUT VOLTAGE LOSS VS.
OSCILLATOR FREQUENCY
INVERTER CONFIGURATION
2.0 CIN = 22 µF TANTALUM
COUT = 33 µF TANTALUM
1.0
0
1
IOUT =10 mA
1.0
Note 4 Test Circuit
10
fOSC (kHz)
100
0
1
IOUT =10 mA
Note 4 Test Circuit
10
fOSC (kHz)
100
OUTPUT VOLTAGE LOSS VS.
INPUT CAPACITOR
1.0
INVERTER CONFIGURATION
COUT = 33µF TANTALUM
0.8 fOSC = 25 kHz
IOUT = 10 mA
0.6
0.4
0.2
0
0
Note 4 Test Circuit
20 40 60 80 100
CIN (µF)
THEORY OF OPERATION
As in any switched capacitor converter, the means of
conveying energy from input to output is done by charging
a capacitor between two potentials and then switching one
end of the capacitor to a different potential. By some
means of rectification, the other end of the capacitor is then
forced to dump charge into another capacitor at the
converter output, thereby conveying energy.
In a simple example shown in Figure 1, a capacitor C1 has
one side tied to ground and another side charged by a
voltage source of potential V1. The non-grounded side of
C1 is then switched over to be connected to one side of a
capacitor C2, which is at potential V2 and referenced to
ground. V2 represents the output of the converter. The
initial charge on C1 is:
q1 = C1 x V1
When the switch changes over to the V2 side, C1 is
discharged from potential V1 to potential V2. After discharge
has occurred the charge on C1 is then:
q2 = C1 x V2
This means that the net transfer of charge which has
occurred is:
V1
fO
C1
V2
IL
C2
FIGURE 1: SWITCHED CAPACITOR CIRCUIT
If the potential V2 is sourcing a current IL, the charge will
have to be delivered at a rate:
ƒO = IL /∆q = IL / C1(V1 – V2)
Thus, the higher the frequency, the more current that can
be supported by the converter output.
All else being ideal, the effective losses in the converter in
the energy conveyance process is identical to that of a
circuit consisting of a resistor between the potentials V1
and V2, with the same load at the output side. This
equivalent resistor is simply:
REQUIV = (V1 – V2) / IL = 1 / (ƒO x C1)
∆q = q1 – q2 = C1 (V1 – V2)
May 1999 TOKO, Inc.
Page 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet TK75018MCTL.PDF ] | |
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