LM2435 반도체 회로 부품 판매점
Monolithic Triple 5.5 ns CRT Driver
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 National Semiconductor |
August 1999
LM2435
Monolithic Triple 5.5 ns CRT Driver
General Description
The LM2435 is an integrated high voltage CRT driver circuit
designed for use in color monitor applications. The IC con-
tains three high input impedance, wide band amplifiers
which directly drive the RGB cathodes of a CRT. Each chan-
nel has its gain internally set to −14 and can drive CRT ca-
pacitive loads as well as resistive loads present in other ap-
plications, limited only by the package’s power dissipation.
The IC is packaged in an industry standard 9-lead TO-220
molded plastic power package. See Thermal Considerations
section.
Features
n Dissipates approximately 45% less power than the
LM2405
n Well matched with LM1279 and LM1282/83 video
preamps
n 0V to 5V input range
n Stable with 0 pF–20 pF capacitive loads and inductive
peaking networks
n Convenient TO-220 staggered lead package style
n Standard LM243X Family Pinout which is designed for
easy PCB layout
Applications
n 1280 x 1024 Displays up to 75 Hz Refresh
n Pixel clock frequencies up to 135 MHz
n Monitors using video blanking
Schematic and Connection Diagrams
DS101044-1
FIGURE 1. Simplified Schematic Diagram
(One Channel)
DS101044-2
Note: Tab is at GND
Top View
Order Number LM2435T
© 1999 National Semiconductor Corporation DS101044
www.national.com
Absolute Maximum Ratings (Notes 1, 3)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage, (VCC)
Bias Voltage, (VBB)
Input Voltage, (VIN)
Storage Temperature Range, (TSTG)
+90V
+16V
0V to 6V
−65˚C to +150˚C
Lead Temperature
(Soldering, <10 sec.)
ESD Tolerance, Human Body Model
Machine Model
300˚C
2 kV
250V
Operating Ranges (Note 2)
VCC
VBB
VIN
VOUT
Case Temperature
+60V to +85V
+8V to +15V
+0V to +5V
+15V to +75V
−20˚C to +100˚C
Do not operate the part without a heat sink.
Electrical Characteristics
(See Figure 2 for Test Circuit)
Unless otherwise noted: VCC = +80V, VBB = +12V, CL = 8 pF, TC = 50˚C
DC Tests: VIN = +2.8 VDC
AC Tests: Output = 40 VPP (25V to 65V) at 1 MHz.
Symbol
Parameter
Condition
ICC
IBB
VOUT
AV
∆AV
LE
tR
tF
OS
Supply Current
Bias Current
DC Output Voltage
DC Voltage Gain
Gain Matching
Linearity Error
Rise Time
Fall Time
Overshoot
Per Channel, No Input Signal, No
Output Load
All Three Channels
No AC Input Signal, VIN = 1.35V
No AC Input Signal
(Note 4), No AC Input Signal
(Notes 4, 5), No AC Input Signal
(Note 6), 10% to 90%
(Note 6), 90% to 10%
(Note 6)
LM2435
Min Typ Max
13
14
62 65 68
−12 −14 −16
1.0
8
5.5
6.0
5
Units
mA
mA
VDC
dB
%
ns
ns
%
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Note 2: Operating ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and
test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may
change when the device is not operated under the listed test conditions.
Note 3: All voltages are measured with respect to GND, unless otherwise specified.
Note 4: Calculated value from Voltage Gain test on each channel.
Note 5: Linearity Error is the variation in dc gain from VIN = 1.0V to VIN = 4.5V.
Note 6: Input from signal generator: tr, tf < 1 ns.
AC Test Circuit
Note: 8 pF load includes parasitic capacitance.
FIGURE 2. Test Circuit (One Channel)
DS101044-3
Figure 2 shows a typical test circuit for evaluation of the LM2435. This circuit is designed to allow testing of the LM2435 in a 50Ω
environment without the use of an expensive FET probe. The two 2490Ω resistors at the output form a 200:1 voltage divider when
connected to a 50Ω load. The compensation cap is used to flatten the frequency response of the 200:1 divider.
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