|
|
PDF ISL78010 Data sheet ( Hoja de datos )
| Número de pieza | ISL78010 | |
| Descripción | Automotive Grade TFT-LCD Power Supply | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ISL78010 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
|
No Preview Available !
®
Data Sheet
May 30, 2007
ISL78010
FN6501.0
Automotive Grade TFT-LCD Power Supply
The ISL78010 is a multiple output regulator for use in all
www.TdaFtTas-LhCeeDt4auu.ctoommotive applications. It features a single boost
converter with an integrated 2A FET, two positive LDOs for
VON and VLOGIC generation, and a single negative LDO for
VOFF generation. The boost converter can be programmed
to operate in either P-mode for optimal transient response or
PI-mode for improved load regulation.
The ISL78010 includes fault protection for all four channels.
Once a fault is detected on either the VBOOST, VON or VOFF
channels, the device is latched off until the input supply or
EN is cycled. If a fault is detected on the VLOGIC channel,
the device is latched off until the input supply is cycled. The
VLOGIC channel is not affected by the EN function.
The ISL78010 also includes an integrated start-up sequence
for VLOGIC, VBOOST, VOFF, then VON or for VLOGIC, VOFF,
VBOOST, and VON. The latter sequence requires a single
external transistor. The timing of the start-up sequence is set
using an external capacitor.
The ISL78010 comes in a 32 Ld 5x5 TQFP package and is
specified for operation over a -40°C to +105°C temperature
range.
Ordering Information
PART NUMBER
(Note)
PART
MARKING
PACKAGE
(Pb-free)
PKG.
DWG. #
ISL78010ANZ*
78010ANZ 32 Ld 5x5 TQFP Q32.5x5
*Add “-T” or “-TK” suffix for tape and reel. Please refer to TB347 for
details on reel specifications.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
Features
• 2A current FET
• 3V to 5V input
• Up to 20V boost output
• 1% regulation on boost output
• VLOGIC-VBOOST-VOFF-VON or
VLOGIC-VOFF-VBOOST-VON sequence control
• Programmable sequence delay
• Fully fault protected
• Thermal shutdown
• Internal soft-start
• 32 Ld 5x5 TQFP packages
• Pb-free plus anneal available (RoHS compliant)
Applications
• All Automotive LCD Displays
Pinout
ISL78010
(32 LD 5X5 TQFP)
TOP VIEW
NC
NC
DELB
NC
LX
NC
DRVP
NC
1
32 31
30
29
28
27
26
25
24
2 23
3 22
4 21
5 20
6 19
7 18
8 17
9 10 11 12 13 14 15 16
VREF
NC
PGND
PGND
PGND
PGND
NC
FBN
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL78010
Typical Performance Curves TA = +25°C, unless otherwise specified. (Continued)
100
80
60
www.datasheet4u.4c0om
AVDD = 9V
AVDD = 12V
AVDD = 15V
100
80
AVDD = 12V
AVDD = 15V
60 AVDD = 9V
40
20 20
0
0 100 200 300 400 500
IOUT (mA)
FIGURE 3. VBOOST EFFICIENCY AT VIN = 3V (P-MODE)
0
0 200 400 600 800
IOUT (mA)
FIGURE 4. VBOOST EFFICIENCY AT VIN = 5V (P-MODE)
0
-0.1
-0.2 AVDD = 9V
-0.3
-0.4 AVDD = 15V
-0.5 AVDD = 12V
-0.6
-0.7
0
100 200 300
IOUT (mA)
400
FIGURE 5. VBOOST LOAD REGULATION AT VIN = 3V (PI-MODE)
0
-0.2
-0.4
AVDD = 12V
-0.6
AVDD = 9V
AVDD = 15V
-0.8
-1.0
0
200 400 600
IOUT (mA)
800
FIGURE 6. VBOOST LOAD REGULATION AT VIN = 5V (PI-MODE)
0
-0.5
-1.0
-1.5
-2.0
-2.5 AVDD = 15V
-3.0
AVDD = 9V
-3.5
-4.0
0
AVDD = 12V
100 200 300 400 500
IOUT (mA)
FIGURE 7. VBOOST LOAD REGULATION AT VIN = 3V (P-MODE)
0
-1
-2
AVDD = 9V
-3
AVDD = 12V
-4
AVDD = 15V
-5
0 200 400 600 800
IOUT (mA)
FIGURE 8. VBOOST LOAD REGULATION AT VIN = 5V (P-MODE)
5 FN6501.0
May 30, 2007
5 Page 
ISL78010
Table 2 gives typical values (margins are considered 10%,
3%, 20%, 10%, and 15%) on VIN, VO, L, fS, and IOMAX:
TABLE 2. TYPICAL VIN, VO, L, fS, AND IOMAX VALUES
VIN (V) VO (V)
3.3 9
www.datasheet4u.com
3.3 12
L (µH)
6.8
6.8
fS
(MHz)
1
1
IOMAX
(A)
0.490686
0.307353
3.3 15 6.8
1
0.197353
5 9 6.8 1
0.743464
5
12 6.8
1
0.465686
5
15 6.8
1
0.29902
Input Capacitor
An input capacitor is used to supply the peak charging
current to the converter. It is recommended that CIN be
larger than 10µF. The reflected ripple voltage will be smaller
with larger CIN. The voltage rating of input capacitor should
be larger than the maximum input voltage.
Boost Inductor
The boost inductor is a critical part which influences the
output voltage ripple, transient response, and efficiency.
Values of 3.3µH to 10µH are to match the internal slope
compensation. The inductor must be able to handle the
following average and peak current:
ILAVG
=
----I--O-------
1–D
ILPK
=
IL
A
V
G
+
-Δ----I--L-
2
(EQ. 5)
(EQ. 6)
Rectifier Diode
A high-speed diode is necessary due to the high switching
frequency. Schottky diodes are recommended because of
their fast recovery time and low forward voltage. The rectifier
diode must meet the output current and peak inductor
current requirements.
Output Capacitor
The output capacitor supplies the load directly and reduces
the ripple voltage at the output. Output ripple voltage
consists of two components: the voltage drop due to the
inductor ripple current flowing through the ESR of output
capacitor, and the charging and discharging of the output
capacitor.
VRIPPLE
=
ILPK
×
ESR
+
-V----O-----–-----V----I--N--
VO
×
------I--O-------
COUT
×
--1--
fS
(EQ. 7)
For low ESR ceramic capacitors, the output ripple is
dominated by the charging and discharging of the output
capacitor. The voltage rating of the output capacitor should
be greater than the maximum output voltage.
NOTE: Capacitors have a voltage coefficient that makes their
effective capacitance drop as the voltage across them increases.
COUT in Equation 7 assumes the effective value of the capacitor at a
particular voltage and not the manufacturer’s stated value, measured
at zero volts.
Compensation
The ISL78010 can operate in either P-mode or PI-mode.
P-mode may be preferred in applications where excellent
transient load performance is required but regulation is not
critical. Connecting the CINT pin directly to VIN will enable
P-mode; For better load regulation, use PI-mode with a
4.7nF capacitor in series with a 10k resistor between CINT
and ground. This value may be reduced to improve transient
performance, however, very low values will reduce loop
stability. Figures 5 through 10 show a comparison of P-mode
vs PI-mode performance.
Boost Feedback Resistors
As the boost output voltage, AVDD, is reduced below 12V the
effective voltage feedback in the IC increases the ratio of
voltage to current feedback at the summing comparator
because R2 decreases relative to R1. To maintain stable
operation over the complete current range of the IC, the
voltage feedback to the FBB pin should be reduced
proportionally, as AVDD is reduced, by means of a series
resistor-capacitor network (R7 and C7) in parallel with R1,
with a pole frequency (fp) set to approximately 10kHz for C2
(effective) = 10µF and 4kHz for C2 (effective) = 30µF.
R7
=
⎛⎛
⎝⎝
-0---.--1----1×-----R-----2-⎠⎞
– R---1--1-⎠⎞ –1
(EQ. 8)
C7
=
------------------------1------------------------
2 × 3.142 × fp × R7
(EQ. 9)
PI-Mode CINT (C23) and RINT (R10)
The IC is designed to operate with a minimum C23 capacitor
of 4.7nF and a minimum C2 (effective) = 10µF.
Note that, for high voltage AVDD, the voltage coefficient of
ceramic capacitors (C2) reduces their effective capacitance
greatly; a 16V, 10µF ceramic can drop to around 3µF at 15V.
To improve the transient load response of AVDD in PI-mode,
a resistor may be added in series with the C23 capacitor. The
larger the resistor the lower the overshoot but at the expense
of stability of the converter loop - especially at high currents.
With L = 10µH, AVDD = 15V, C23 = 4.7nF, C2 (effective)
should have a capacitance of greater than 10µF. RINT (R7)
can have values up to 5kΩ for C2 (effective) up to 20µF and
up to 10k for C2 (effective) up to 30µF.
Larger values of RINT (R7) may be possible if maximum
AVDD load currents less than the current limit are used. To
ensure AVDD stability, the IC should be operated at the
maximum desired current and then the transient load
response of AVDD should be used to determine the
maximum value of RINT.
11 FN6501.0
May 30, 2007
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet ISL78010.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ISL78010 | Automotive Grade TFT-LCD Power Supply | Intersil Corporation |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |