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參數(shù)資料
| 型號： | LT1054CN8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Switched-Capacitor Voltage Converter with Regulator |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 25 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 12/26頁 |
| 文件大小： | 444K |
| 代理商： | LT1054CN8 |
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SLVS033F FEBRUARY 1990 REVISED NOVEMBER 2004
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
regulation (continued)
The error amplifier of the LT1054 drives the pnp switch to control the voltage across the input capacitor (C
IN
),
which determines the output voltage. When the reference and error amplifier of the LT1054 are used, an external
resistive divider is all that is needed to set the regulated output voltage. Figure 16 shows the basic regulator
configuration and the formula for calculating the appropriate resistor values. R1 should be 20 k
or greater
because the reference current is limited to
±
100
μ
A. R2 should be in the range of 100 k
to 300 k
. Frequency
compensation is accomplished by adjusting the ratio of C
IN
to C
OUT.
For best results, this ratio should be approximately 1:10. Capacitor C1, required for good load regulation, should
be 0.002
μ
F for all output voltages.
The functional block diagram shows that the maximum regulated output voltage is limited by the supply voltage.
For the basic configuration,
V
OUT
referenced to the ground terminal of the LT1054 must be less than the total
of the supply voltage minus the voltage loss due to the switches. The voltage loss versus output current due
to the switches can be found in the typical performance curves. Other configurations, such
as the negative
doubler, can provide higher voltages at reduced output currents.
capacitor selection
While the exact values of C
IN
and C
OUT
are noncritical, good-quality low-ESR capacitors, such as solid
tantalum, are necessary to minimize voltage losses at high currents. For C
IN
, the effect of the ESR of the
capacitor is multiplied by four, because switch currents are approximately two times higher than output current.
Losses occur on both the charge and discharge cycle, which means that a capacitor with 1
of ESR for C
IN
has the same effect as increasing the output impedance of the LT1054 by 4
. This represents a significant
increase in the voltage losses. C
OUT
alternately is charged and discharged at a current approximately equal
to the output current. The ESR of the capacitor causes a step function to occur in the output ripple at the switch
transitions. This step function degrades the output regulation for changes in output load current and should be
avoided. A technique used to gain both low ESR and reasonable cost is to parallel a smaller tantalum capacitor
with a large aluminum electrolytic capacitor.
output ripple
The peak-to-peak output ripple is determined by the output capacitor and the output current values.
Peak-to-peak output ripple is approximated as:
V
I
OUT
2fC
OUT
Where:
V
f
OSC
= oscillator frequency
For output capacitors with significant ESR, a second term must be added to account for the voltage step at the
switch transitions. This step is approximately equal to:
= peak-to-peak ripple
2I
OUT
ESR of C
OUT
(5)
(6)
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