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參數(shù)資料
| 型號： | AAT3190 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | Positive/Negative Charge Pump for Voltage Bias |
| 中文描述： | 正/負(fù)電荷泵電壓偏置 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 411K |
| 代理商： | AAT3190 |
AAT3190
Positive/Negative Charge Pump for Voltage Bias
3190.2005.03.1.0
11
With R2 selected, R1 can be determined:
V
OP
The positive output voltage is set by way of a resis-
tive divider from the output (V
OP
) to the FBP and
ground pin. Limiting the size of R4 reduces the
effect of the FBP bias current. For less than 0.1%
error, limit R4 to less than 12k
.
Once R4 has been determined, solve for R3:
Flying and Output Capacitor
The flying capacitor minimum value is limited by
the output power requirement, while the maximum
value is set by the bandwidth of the power supply.
If C
FLY
is too small, the output may not be able to
deliver the power demanded, while too large of a
capacitor may limit the bandwidth and time
required to recover from load and line transients. A
0.1μF X7R or X5R ceramic capacitor is typically
used. The voltage rating of the flying and reservoir
output capacitors varies with the number of charge
pump stages. The reservoir output capacitor
should be roughly 10 times the flying capacitor.
Use larger capacitors for reduced output ripple. A
1μF X7R or X5R type ceramic is typically used.
Positive Output Capacitor Voltage
Ratings
The absolute steady-state maximum output voltage
(neglecting the internal R
DS(ON)
drop of the internal
MOSFETs) for the nth stage is:
where V
FWD
is the estimated forward drop of the
Schottky diode. This is also the voltage rating
required for the nth bulk capacitor in the positive
output charge pump.
The voltage rating for the nth flying capacitor in the
positive stage is:
where V
BULK(0)
is the input voltage. (See Table 1.)
Table 1: Positive Output Capacitor Voltages.
Negative Output Capacitor Voltage
Ratings
The absolute steady-state maximum output voltage
(neglecting the internal R
DS(ON)
drop of the internal
MOSFETs) for the nth stage is:
This is also the voltage rating required for the nth
bulk capacitor in the negative output charge pump.
V
BULK(n)
= -n · V
IN
+ 2 · n · V
FWD
V
IN
= 5.0V, V
FWD
= 0.3V
Stages (n)
1
2
3
4
5
6
V
BULK(n)
9.4V
13.8V
18.2V
22.6V
27.0V
31.4V
V
FLY(n)
4.7V
9.1V
13.5V
17.9V
22.3V
26.7V
V
FLY(n)
= V
BULK(n + 1)
- V
FWD
V
BULK(n)
= (n + 1) · V
IN
- 2 · n · V
FWD
R3 = R4 · V
V
REF
I
FBP
I
PGM
=
= 0.1%
0.1
μ
A
100
μ
A
V
REF
R4
I
PGM
=
=
= 100
μ
A
1.2V
12k
V
NEG
· R2
-V
REF
R1 =
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AAT3190_06 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Positive/Negative Charge Pump for Voltage Bias |
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| AAT3191IJQ-T1 | 制造商:SKYWORKS SOLUTIONS INC 功能描述:DESCRIPTION: CHPMP WLED DRIVERS TR |
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