NSC LM2426TE Datasheet
LM2426TE
Monolithic Triple Channel 30 MHz DTV Driver
LM2426TE Monolithic Triple Channel 30 MHz DTV Driver
May 2003
General Description
The LM2426TE is an integrated high voltage CRT driver
circuit designed for use in HDTV applications. The IC contains three high input impedance, wide band amplifiers
which directly drive the RGB cathodes of a CRT. Each
channel has its gain internally set to −53 and can drive CRT
capacitive loads as well as resistive loads present in other
applications, limited only by the package’s power dissipation.
The IC is packaged in an industry standard 11-lead TO-220
molded plastic power package designed specifically to meet
high voltage spacing requirements. See Thermal Considerations section.
Features
n 0V to 5V input range
n Greater than 130V
n Stable with 0– 20 pF capacitive loads and inductive
peaking networks
n Convenient TO-220 staggered thin lead package style
output swing capability
PP
Applications
n AC coupled HDTV applications using the 1080i and
720p formats as well as standard NTSC and PAL
formats.
Connection Diagram Schematic Diagram
Note: Tab is at GND
Top View
Order Number LM2426TE
FIGURE 1. Simplified Connection and Pinout Diagram
© 2003 National Semiconductor Corporation DS200664 www.national.com
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20066401
FIGURE 2. Simplified Schematic Diagram
(One Channel)
Absolute Maximum Ratings (Notes 1,
3)
If Military/Aerospace specified devices are required,
LM2426TE
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
Bias Voltage (V
Input Voltage (V
Storage Temperature Range (T
) +200V
CC
) +15V
BB
) -0.5V to VBB+0.5V
IN
) −65˚C to +150˚C
STG
Operating Ranges (Note 2)
V
CC
V
BB
V
IN
V
OUT
Case Temperature Refer to Figure 11
Do not operate the part without a heat sink.
+130V to +180V
+7V to +13V
+15V to +175V
Lead Temperature
(Soldering,
<
10 sec.) 300˚C
ESD Tolerance,
Human Body Model 2kV
Machine Model 200V
Junction Temperature 150˚C
θ
(typ) 2.9˚C/W
JC
Electrical Characteristics
(See Figure 3 for Test Circuit) Unless otherwise noted: VCC= +180V, VBB= +8V, CL= 8pF, TC= 50˚C. DC Tests: VIN=
. AC Tests: Output = 110VPP(55V - 165V) at 1MHz.
2.5V
DC
Symbol Parameter Conditions
I
CC
Supply Current All Three Channels, No Input Signal,
No Output Load
I
BB
V
OUT, 1
V
OUT, 2
A
V
∆A
V
Bias Current All Three Channels 15 22 mA
DC Output Voltage No AC Input Signal, VIN= 2.5V
DC Output Voltage No AC Input Signal, VIN= 1.2V
DC
DC
DC Voltage Gain No AC Input Signal -50 -53 -56
Gain Matching (Note 4), No AC Input Signal 1.0 dB
LE Linearity Error (Notes 4, 5), No AC Input Signal 8 %
t
R
t
F
Rise Time (Note 6), 10% to 90% 13 ns
Fall Time (Note 6), 90% to 10% 13 ns
OS Overshoot (Note 6) 7 %
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. Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. 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 V
<
Note 6: Input from signal generator: t
r,tf
1 ns.
= 1.1V to VIN= 3.8V.
IN
LM2426TE
Min Typical Max
28 40 mA
93 98 103 V
160 165 170 V
+0V to +4V
Units
DC
DC
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AC Test Circuit
LM2426TE
Note: 8pF load includes parasitic capacitance.
FIGURE 3. Test Circuit (One Channel)
Figure 3 shows a typical test circuit for evaluation of the LM2426TE. This circuit is designed to allow testing of the LM2426TE in
a50Ω environment without the use of an expensive FET probe. The two 4990Ω resistors form a 400:1 divider with the 50Ω
resistor and the oscilloscope. A test point is included for easy use of an oscilloscope probe.The compensation capacitor is used
to compensate the network to achieve flat frequency response.
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Typical Performance Characteristics (V
(55V − 165V), Test Circuit - Figure 3 unless otherwise specified)
LM2426TE
= +180VDC,VBB= +8VDC,CL= 8pF, V
CC
OUT
= 110V
PP
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FIGURE 4. V
OUT
vs V
IN
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FIGURE 5. LM2426TE Pulse Response
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FIGURE 7. Speed vs Load Capacitance
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FIGURE 8. Speed vs Offset
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FIGURE 6. Bandwidth
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FIGURE 9. Speed vs Case Temperature
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