LM2429
Monolithic Triple Channel 15 MHz DTV Driver
General Description
The LM2429 is an integrated high voltage CRT driver circuit
designed for use in DTV 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 -51 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 Consider-
ations section.
Features
n
0V to 5V input range
n
Greater than 130V
PP
output swing capability
n
Stable with 020 pF capacitive loads and inductive
peaking networks
n
Convenient TO-220 staggered thin lead package style
Applications
n
AC coupled DTV applications using the 480p format as
well as standard NTSC and PAL formats.
Connection Diagram
Schematic Diagram
20073102
Note: Tab is at GND
Top View
Order Number LM2429
FIGURE 1. Simplified Connection and Pinout Diagram
20073101
FIGURE 2. Simplified Schematic Diagram
(One Channel)
October 2004
LM2429
Monolithic
T
riple
Channel
15
MHz
DTV
Driver
2004 National Semiconductor Corporation
DS200731
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 (V
CC
)
+200V
Bias Voltage (V
BB
)
+15V
Input Voltage (V
IN
)
-0.5V to V
BB
+0.5V
Storage Temperature Range (T
STG
)
-65C to +150C
Lead Temperature
(Soldering,
<
10 sec.)
300C
ESD Tolerance,
Human Body Model
2kV
Machine Model
200V
Junction Temperature
150C
JC
(typ)
2.9C/W
Operating Ranges
(Note 2)
V
CC
+130V to +180V
V
BB
+7V to +13V
V
IN
+0V to +4V
V
OUT
+15V to +175V
Case Temperature
Refer to Figure 11
Do not operate the part without a heat sink.
Electrical Characteristics
(See Figure 3 for Test Circuit) Unless otherwise noted: V
CC
= +180V, V
BB
= +8V, C
L
= 8pF, T
C
= 50C. DC Tests: V
IN
=
2.5V
DC
. AC Tests: Output = 130V
PP
(35V - 165V) at 1MHz.
Symbol
Parameter
Conditions
LM2429
Units
Min
Typical
Max
I
CC
Supply Current
All Three Channels, No Input Signal,
No Output Load
16
30
mA
I
BB
Bias Current
All Three Channels
12
17
mA
V
OUT, 1
DC Output Voltage
No AC Input Signal, V
IN
= 2.5V
DC
100
105
110
V
DC
V
OUT, 2
DC Output Voltage
No AC Input Signal, V
IN
= 1.2V
DC
163
168
173
V
DC
A
V
DC Voltage Gain
No AC Input Signal
-48
-51
-54
A
V
Gain Matching
(Note 4), No AC Input Signal
1.0
dB
LE
Linearity Error
(Notes 4, 5), No AC Input Signal
8
%
t
R
Rise Time
(Note 6), 10% to 90%
26
ns
t
F
Fall Time
(Note 6), 90% to 10%
30
ns
OS
Overshoot
(Note 6)
5
%
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
IN
= 1.1V to V
IN
= 3.8V.
Note 6: Input from signal generator: t
r
, t
f
<
1 ns.
LM2429
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2
AC Test Circuit
Figure 3 shows a typical test circuit for evaluation of the LM2429. This circuit is designed to allow testing of the LM2429 in a 50
environment without the use of an expensive FET probe. The two 4990
resistors form a 400:1 divider with the 50 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.
20073103
Note: 8pF load includes parasitic capacitance.
FIGURE 3. Test Circuit (One Channel)
LM2429
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3
Typical Performance Characteristics
(V
CC
= +180V
DC
, V
BB
= +8V
DC
, C
L
= 8pF, V
OUT
= 130V
PP
(35V - 165V), Test Circuit - Figure 3 unless otherwise specified)
20073104
FIGURE 4. V
OUT
vs V
IN
20073106
FIGURE 5. LM2429 Pulse Response
20073118
FIGURE 6. Bandwidth
20073105
FIGURE 7. Speed vs Load Capacitance
20073108
FIGURE 8. Speed vs Offset
20073109
FIGURE 9. Speed vs Case Temperature
LM2429
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4
Typical Performance Characteristics
(V
CC
= +180V
DC
, V
BB
= +8V
DC
, C
L
= 8pF, V
OUT
= 130V
PP
(35V - 165V), Test Circuit - Figure 3 unless otherwise specified) (Continued)
20073107
FIGURE 10. Power Dissipation vs Frequency
20073116
FIGURE 11. Power Derating Curve
20073119
FIGURE 12. Cathode Pulse Response
LM2429
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5
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