ISL78010_11 INTERSIL [Intersil Corporation], ISL78010_11 Datasheet - Page 13

• Manufacturer Part Number: ISL78010_11
• Description: Automotive Grade TFT-LCD Power Supply
• Manufacturer: INTERSIL [Intersil Corporation]

For the ISL78010, the minimum drive current is as shown in
Equation 10:
The minimum base-emitter resistor, R
calculated as shown in Equation 11:
This is the minimum value that can be used. Choose a
convenient value greater than this minimum value; for
example, 500Ω. Larger values may be used to reduce
quiescent current; however, regulation may be adversely
affected by supply noise if the value of R
I
R
1.25V
PG_LDON
DRVL
0.9V
PG_LDOP
BL
0.4V
(
min
FIGURE 24. V
(
⁄
FIGURE 23. V
min
(
8mA 500mA 100
)
GMN
+
-
+
GMP
=
-
)
+
=
-
V
–
+
-
CLAMP
BE
8mA
ESD
36V
(
1: Nn
max
1: Np
LDO_OFF
OFF
ON
CLAMP
LDO_ON
⁄
ESD
)
36V
⁄
FUNCTIONAL BLOCK DIAGRAM
FUNCTIONAL BLOCK DIAGRAM
(
I
DRVL
)
=
FBN
DRVN
13
417Ω
R
3kΩ
DRVP
FBP
BN
(
min
R
7kΩ
BP
) I
20kΩ
–
R
R
N2
N1
BL
C
20kΩ
V
R
R
REF
⁄
, can now be
V
Q2
BL
h
P1
P2
BOOST
FE
Q3
is too high.
(
0.1µF
min
CP (TO 36V)
V
ON
CP (TO -26V)
V
0.1µF
OFF
)
) =
(TO 35V)
0.1µF
C
(TO -20V)
(EQ. 10)
ON
(EQ. 11)
LX
0.1µF
C
LX
OFF
ISL78010
The V
of the row driver in the LCD panel. The DC/DC consists of an
external diode-capacitor charge pump powered from the
inductor (LX) of the boost converter, followed by a low
dropout linear regulator (LDO_ON). The LDO_ON regulator
uses an external PNP transistor as the pass element. The
on-board LDO controller is a wide band (>10MHz)
transconductance amplifier capable of 4mA drive current,
which is sufficient for up to 40mA or more output current
under the low dropout condition (forced beta of 10). Typical
V
to +36V. A fault comparator is also included for monitoring
the output voltage. The undervoltage threshold is set at 25%
below the 1.2V reference.
The V
supply of the row driver in the LCD panel. The DC/DC
consists of an external diode-capacitor charge pump
powered from the inductor (LX) of the boost converter,
followed by a low dropout linear regulator (LDO_OFF). The
LDO_OFF regulator uses an external NPN transistor as the
pass element. The on-board LDO controller is a wide band
(>10MHz) transconductance amplifier capable of 4mA drive
current, which is sufficient for up to 40mA or more output
current under the low dropout condition (forced beta of 10).
Typical V
from -5V to -20V. A fault comparator is also included for
monitoring the output voltage. The undervoltage threshold is
set at 200mV above the 0.2V reference level.
The V
within the LCD panel. The DC/DC may be powered directly
from the low voltage input, 3.3V or 5.0V, or it may be
powered through the fault protection switch. The
LDO_LOGIC regulator uses an external PNP transistor as
the pass element. The on-board LDO controller is a wide
band (>10MHz) transconductance amplifier capable of
16mA drive current, which is sufficient for up to 160mA or
ON
0.9V
PG_LDOL
FIGURE 25. V
voltage supported by the ISL78010 ranges from +15V
LOGIC
ON
OFF
OFF
power supply is used to power the positive supply
+
GML
power supply is used to power the negative
-
power supply is used to power the logic circuitry
+
-
voltage supported by the ISL78010 ranges
LOGIC
1: N1
LDO_LOG
FUNCTIONAL BLOCK DIAGRAM
DRVL
FBL
500Ω
R
BL
V
20kΩ
IN
R
R
(3V TO 6V)
L1
L2
OR V
Q5
(1.3V TO 3.6V)
PROT
V
LOGIC
May 3, 2011
C
10µF
FN6501.1
LOG