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参数资料
| 型号： | ISL78010EVAL1Z |
| 厂商： | Intersil |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD 1 FOR ISL78010 |
| 标准包装： | 1 |
| 系列： | * |
ISL78010
For the ISL78010, the minimum drive current is as shown in
Equation 10:
V IN OR V PROT
(3V TO 6V)
I DRVL ( min ) = 8mA
(EQ. 10)
0.9V
LDO_LOG
V LOGIC
The minimum base-emitter resistor, R BL , can now be
calculated as shown in Equation 11:
R BL ( min ) = V BE ( max ) ? ( I DRVL ( min ) – I C ? h FE ( min ) ) =
(EQ. 11)
1.25V ? ( 8mA – 500mA ? 100 ) = 417 Ω
PG_LDOL
+
-
R BL
500 Ω
DRVL
Q5
(1.3V TO 3.6V)
C LOG
R L1
10μF
This is the minimum value that can be used. Choose a
convenient value greater than this minimum value; for
FBL
example, 500 Ω . Larger values may be used to reduce
quiescent current; however, regulation may be adversely
affected by supply noise if the value of R BL is too high.
V BOOST
LX
-
+
GML
1: N1
R L2
20k Ω
0.9V
LDO_ON
0.1μF
FIGURE 25. V LOGIC FUNCTIONAL BLOCK DIAGRAM
PG_LDOP
+
-
36V
ESD
CLAMP
R BP
7k Ω
Q3
CP (TO 36V)
0.1μF
The V ON power supply is used to power the positive 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
DRVP
V ON (TO 35V)
dropout linear regulator (LDO_ON). The LDO_ON regulator
+
-
GMP
FBP
R P1
R P2
20k Ω
C ON
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
1: Np
FIGURE 23. V ON FUNCTIONAL BLOCK DIAGRAM
LX
0.1μF
CP (TO -26V)
V ON voltage supported by the ISL78010 ranges from +15V
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 OFF power supply is used to power the negative
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
PG_LDON
0.4V
-
+
LDO_OFF
FBN
V REF
R N2
20k Ω
0.1μF
current, which is sufficient for up to 40mA or more output
current under the low dropout condition (forced beta of 10).
Typical V OFF voltage supported by the ISL78010 ranges
from -5V to -20V. A fault comparator is also included for
monitoring the output voltage. The undervoltage threshold is
1: Nn
R N1
set at 200mV above the 0.2V reference level.
-
+
GMN
36V
ESD
CLAMP
DRVN
R BN
3k Ω
Q2
V OFF (TO -20V)
C OFF
The V LOGIC power supply is used to power the logic circuitry
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
FIGURE 24. V OFF FUNCTIONAL BLOCK DIAGRAM
13
band (>10MHz) transconductance amplifier capable of
16mA drive current, which is sufficient for up to 160mA or
FN6501.2
December 4, 2013
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