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National Semiconductor Electronic Components Datasheet

LM2451 Datasheet

220V Monolithic Triple Channel 12 MHz DC Coupled CRT DTV Driver

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LM2451 pdf
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December 2005
LM2451
220V Monolithic Triple Channel 12 MHz DC Coupled CRT
DTV Driver
General Description
The LM2451 is a triple channel high voltage DC coupled
CRT driver circuit designed for use in DTV applications. The
IC contains three high input impedance, wide band amplifi-
ers which directly drive the RGB cathodes of a CRT. Each
amplifier has a summing input where the DC level of the
output is controlled by a low voltage DC input voltage. Nor-
mally the DC input voltage is from a DAC. Each channel has
its gain internally set to −54 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 a 15-lead TO-247 molded plastic
power package designed specifically to meet high voltage
spacing requirements. See Thermal Considerations section.
Features
n 12 MHz bandwidth at 130VP-P
n 100V black level adjustment range using 0V to 5V input
n Current output for IK feedback systems
n Greater than 130VP-P output swing capability
n 0V to 5V input voltage range
n Stable with 0 pF–20 pF capacitive loads and inductive
peaking networks
n Convenient TO-247 staggered thin lead package style
Applications
n DC coupled DTV applications using the 480p format as
well as standard NTSC and PAL formats.
Connection Diagram
Schematic Diagram
20144401
FIGURE 1. Top View
Order Number LM2451TB
See NS Package Number TB15A
20144402
FIGURE 2. Simplified Schematic Diagram
(One Channel)
© 2005 National Semiconductor Corporation DS201444
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National Semiconductor Electronic Components Datasheet

LM2451 Datasheet

220V Monolithic Triple Channel 12 MHz DC Coupled CRT DTV Driver

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LM2451 pdf
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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)
+250V
Bias Voltage (VBB)
+16V
Input Voltage (VIN)
−0.5V to VBB +0.5V
Storage Temperature Range (TSTG) −65˚C to +150˚C
Lead Temperature
(Soldering, <10 sec.)
300˚C
ESD Tolerance,
Human Body Model
2 kV
Machine Model
200V
Junction Temperature
θJC (typ)
150˚C
4.0˚C/W
Operating Ratings (Note 2)
VCC
VBB
VIN
VOUT
Case Temperature
+100V to +230V
+7V to +13V
+0V to +5V
+40V to +215V
110˚C
(10W max power)
Do not operate the part without a heat sink and thermal
grease. Heat sink must have a thermal resistance under
5.0˚C/W. (Note 7)
Electrical Characteristics
(See Figure 3 for Test Circuit). Unless otherwise noted: VCC = +220V, VBB = +12V, VDAC = +0.5V, CL = 10 pF, TC = 50˚C. DC
Tests: VIN = +2.7VDC. AC Tests: Output = 130VPP (60V – 190V) at 1 MHz.
Symbol
Parameter
Conditions
LM2451
Min Typ Max
Units
ICC Supply Current
No Input Signal, No Video Input, No
Output Load
10
18 25 mA
IBB
VOUT, 1
VOUT, 2
VOUT, 3
VOUT, 4
AV
ADAC
AV
LE
Bias Current
DC Output Voltage
DC Output Voltage
DC Output Voltage
DC Output Voltage
DC Voltage Gain
DAC Input DC Voltage Gain
Gain Matching
Linearity Error
No AC Input Signal, VIN = 2.7VDC
No AC Input Signal, VIN = 1.2VDC
No AC Input Signal, VIN = 1.2VDC,
VDAC = 1.2VDC
No AC Input Signal, VIN = 1.2VDC,
VDAC = 2.7VDC
No AC Input Signal
No AC Input Signal
(Note 4), No AC Input Signal
(Notes 4, 5), No AC Input Signal
18 26 34 mA
122 127 132 VDC
200 205 210 VDC
192 198 204 VDC
154 160 166 VDC
−51 −54 −57 V/V
−23 −26 −29 V/V
1.0 dB
8%
tr
+OS
Rise Time
Overshoot
(Note 6), 10% to 90%
31 ns
10 %
tf
−OS
Fall Time
Overshoot
(Note 6), 90% to 10%
(Note 6)
34 ns
3%
BWL
Large Signal Bandwidth
VOUT AC = 130 VP-P, VOUT DC = 125 V
12
MHz
BWM
Medium Signal Bandwidth
VOUT AC = 100 VP-P, VOUT DC = 125 V
14
MHz
BWS
Small Signal Bandwidth
VOUT AC = 60 VP-P, VOUT DC = 125 V
16
MHz
IkERROR Current Output Error
Output Current = 0 µA to 200 µA
−52 0 52 µA
IkERROR Current Output Difference
Between Channels
Output Current = 0 µA to 200 µA
0
NA 32
µA
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 VIN = 1.10V to VIN = 4.30V.
Note 6: Input from signal generator: tr, tf < 10 ns.
Note 7: Running the 1 MHz to 30 MHz test pattern at 1080i this part will dissipate approximately 10 W. This is the commonly accepted test pattern that is
representative of the worst case high frequency content for normal television viewing. This is the pattern used to estimate the worst case power dissipation of the
LM2451 in its normal application. It is recommended to use a heat sink with a thermal resistance of 5.0˚C/W or better.
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2


Part Number LM2451
Description 220V Monolithic Triple Channel 12 MHz DC Coupled CRT DTV Driver
Maker National Semiconductor
Total Page 12 Pages
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