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PDF AIC1533 Data sheet ( Hoja de datos )
| Número de pieza | AIC1533 | |
| Descripción | Triple-Output LCD Power Supply | |
| Fabricantes | Analog Intergrations Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AIC1533 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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AIC1533
Triple-Output LCD Power Supply
FEATURES
DESCRIPTION
One Low Dropout Linear Regulator
Dropout Voltage 500mV at 0.3A Output Current
Dual Adjustable Charge Pump
Up to +30V Positive Output
Down to -10V Negative Output
AIC1533, composed of dual charge pumps and a
regulator, provide three independent regulated
voltages designed for using in thin-film transistor
(TFT) liquid crystal display (LCD).
Power Up Sequencing and Adjustable Delay
The main regulator has an adjustable output
time voltage and a low dropout voltage of 500mV at
Power-Saving Shutdown Mode (0.1µA typical)
300mA load current is performed.
Operating Supply Voltage: 12V
1MHz Operation Frequency
Internal Current Limit and Thermal Protection
built in LDO part
Few External Components Required
The dual charge pumps independently regulate a
positive output and a negative output. AIC1533
has thermal shutdown capability and survives a
continuous short circuit from output to ground. A
unique control scheme minimizes output ripple as
APPLICATIONS
LCD Monitor Panel Module
well as output capacitance for both charge pump.
DataSheet4U.co1mMHz-switching
low noise, low
frequency
cost total
of AIC1533 provides a
solution. The device
DataShee
LCD TV Panel Module
operates up to 15V supply voltage and is available
in 14-lead SOP and 16-lead TSSOP package.
Analog Integrations Corporation
DataSheet4U.com
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510 www.analog.com.tw
DS-1533P-02 010405
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AIC1533
ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER
TEST CONDITIONS
CHARGE PUMP TERMINAL SPECIFICATION
FBP Threshold
FBN Threshold
VREF Voltage
Continuous Output Current
TP/TN Bias Current
IREF=250µA
VIN =12V
TP/TN Input Threshold
Switching Frequency
Internal Switch On-Resistance
SUPP switch
SWP switch
SWN switch
SHUTDOWN TERMINAL SPECIFICATIONS
et4U.com
SHDN Pin Current
SHDN Pin Voltage
V SHDN=2.4V
Output ONDataSheet4U.com
Output OFF
MIN. TYP. MAX. UNIT
1.225
-30
1.231
3
1.225
0.70
1.25
0
1.25
5
1.25
1
5
5
5
1.275
30
1.269
30
7
1.275
1.30
10
10
10
V
mV
V
mA
µA
V
MHz
Ω
0.1 1 µA
2.4 DataShee
V
0.6
Note 1: Specifications are production tested at TA=25°C. Specifications over the -40°C to 85°C operating
temperature range are assured by design, characterization and correlation with Statistical Quality
Controls (SQC).
Note 2: Current limit is measured by pulse testing.
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AIC1533
During off state, Q2 at on stage and Q3 off stage,
voltage of C2 is the addition of VCC and VCFLY1.
And then go back to on state with voltage of CFLY2
equal to VC2, which is twice as much voltage as
VCC. Lastly, the system goes to off state, voltage of
Co1 is the addition of VCC and CFLY2, that is, three
times as much voltage as VCC.
Fig.17 shows the structure of a negative charge
pump. During on state, which represents Q4 at on
stage and Q5 at off stage, voltage of CFLY3 is equal
to VCC. During off state, indicating Q4 at off stage
and Q5 on stage, SWN pin connects to PGND
directly, and voltage of Co2 equals to -VCC.
AIC1533
VCC
SWN
Q4 CFLY3
3
Q5 FBN
D3
1
2
VREF
PGND
R5 C5
Vn
-
Co2
+
R6
C4
Fig. 17 Structure of Negative Charge Pump
et4U.com
C1
C2
Vp
+ Co1
-
12VIN
AIC1533
VCC
Q1
Power-Up Sequence And Adjustable Delay
Time
D1
1
3
2
SUPP
CFLY1 SWP
FBP
D2
1
3 CFLY2
2
R1 R2
C3
For thin-film transistor (TFT) liquid crystal display
DQ2ataSheet4U.caopmplications,
power-up
sequence
of
three
output
DataShee
voltages is required. Fig. 3 indicates the power-up
Q3 sequence of AIC1533. After shutdown exit delay
time, output of LDO starts rising. When it reaches to
PGND
90% of normal voltage, which is determined by an
external resistor divider, CN starts being charged
from 5µA current source (referring to BLOCK
DIAGRAM). The charging time of CN, defined as T1,
can be calculated as
T1
=
Cn
×
VTH,n
In
(1)
Fig.16 Structure of Positive Charge Pump
where VTH,η = negative threshold voltage, 1.25V,
In = negative bias current, 5µA
Afterwards, while negative output voltage starts
decreasing from 0V, VFBN decreases from 1.1V to
0V proportionally. As VFBN decreases to 10% of
VREF, Q7 turns off and Cp starts being charged
from 5µA current source (referring to BLOCK
DIAGRAM). The charging time of CP, defined as T2,
can be calculated as
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11
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| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AIC1533.PDF ] | |
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