STMICROELECTRONICS STV9381

STV9381
CLASS-D VERTICAL DEFLECTION AMPLIFIER FOR TV AND
MONITOR APPLICATION
FEATURES
■
■
■
■
■
■
■
■
HIGH EFFICIENCY POWER AMPLIFIER
NO HEATSINK
SPLIT SUPPLY
INTERNAL FLYBACK GENERATOR
OUTPUT CURRENT UP TO 3 APP
SUITABLE FOR DC COUPLING
APPLICATION
FEW EXTERNAL COMPONENTS
PROTECTION AGAINST LOW Vcc
PDIP20 (14+3+3)
ORDER CODE: STV9381
DESCRIPTION
Designed for monitors and TVs, the STV9381 is a
class-D vertical deflection booster assembled in
PDIP20 Package.
It operates with supplies up to +/- 18V, provides
up to 3 App output current to drive the yoke. The
internal flyback generator avoids the need for an
extra power supply.
PIN CONNECTION
-VCC
1
20
-VCC
-VCC
2
19
-VCC
-VCC
3
18
-VCC
OUT
4
17
-VCCPOW
CFLY +
5
16
+ VCC POW
CFLY -
6
15
+VCC
BOOT
7
14
EAout
VREG
8
13
IN+
9
12
10
11
INSGND
FEEDCAP
FREQ
Version 3.0
September 2003
1/8
1
STV9381
1
PIN FUNCTIONS
Pin
Number
Name
1
-VCC
Negative supply
2
-VCC
Negative supply
3
-VCC
Negative supply
4
OUT
PWM Output
5
CFLY+
Flyback capacitor
6
CFLY-
Flyback capacitor
7
BOOT
Bootstrap capacitor
2
8
VREG
9
FEEDCAP
Function
Internal voltage regulator
Feed-back integrating capacitor
10
FREQ
Frequency setting resistor
11
SGND
Signal Ground
12
IN-
Error amplifier inverting input
13
IN+
Error amplifier non-inverting input
14
EA out
Error amplifier output
15
+VCC
Positive supply
16
+VCCPOW
Positive Power supply
17
-VccPOW
Negative Power supply
18
-VCC
Negative supply
19
-VCC
Negative supply
20
-VCC
Negative supply
FUNCTIONAL DESCRIPTION
The STV9381 is a vertical deflection circuit operating in class D. The class D is a modulation method
where the output transistors work in switching mode at high frequency. The output signal is restored by filtering the output square wave with an external LC filter. The major interest of this IC is the low power dissipation comparatively to traditional amplifiers operating in class AB, eliminating the need of an heatsink.
Except for the output stage which uses the class D modulation, the circuit operation is similar to the one
of a traditional linear vertical amplifier.
A reference signal (sawtooth) has to be applied to the circuit which can accept a differential or single ended signal. This sawtooth is amplified and applied as a current to the deflection yoke. This current is measured by means of a low value resistor. The resulting voltage is used as a feed-back signal to guarantee the
conformity of the yoke current with the reference input signal.
The overvoltage necessary for a fast retrace is obtained with a chemical capacitor charged at the power
supply voltage of the circuit. At the flyback moment this capacitor is connected in series with the output
stage power supply. This method, used for several years with the linear vertical boosters and called “internal flyback” or “flyback generator”, avoids the need of an additional power supply, while reducing the
flyback duration.
The circuit uses a BCD process that combines Bipolar, CMOS and DMOS devices. DMOS transistors are
used in the output stage due to the absence of second breakdown.
2/8
2
Figure 1. Test and application circuit
+VCC
100nF
1000µF
100nF
15
-VCC
+VCC
16
+VCC power
STV9380
STV9381
VREG
-VCC
8
Flyback
detection
Vref
100nF
Flyback
generator
CFLY+
5
6
CFLYBACK
100µF
CFLYBOOT
IN+
1kΩ
IN -
+
Output
drive
Modulator
_
12
Input signal
Cboot
220nF
7
13
OUT
4
EA out
1mH
150Ω
470nF
14
10kΩ
1kΩ
150Ω
Deflect.
Yoke*
200Ω
Pins 1,2,3,18,19,20
9
11
SGND
10
FEEDCAP
470pF
4.7nF
560pF
17
FREQ
10kΩ
-VCC
-VCC power
100nF
1000µF
Sense
resistor
0.5Ω
-VCC
2
3/8
fvert = 50Hz
STV9381
* Deflection yoke characteristics: R = 5.5Ω, L = 7mH
STV9381
Figure 2. Rth with “on board” Square Heatsink vs. copper area
Rthj-a
(°C/W)
COPPER AREA 35µm
THICKNESS
70
PC BOARD
60
50
40
0
3
8
12
Area(cm2)
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
Tstg, Tj
Parameter
DC Supply Voltage
Unit
±20
V
°C
0 to +70
°C
ESD Susceptibility - Human Body Model (100 pF discharge through
1.5 kΩ)
±2
kV
Iout
Output current
±2
A
Vout
Maximum output voltage (pin 4) with respect to -Vcc
(pins 1, 2, 3, 18, 19, 20) and during flyback (see Note 1)
80
V
Operating Temperature Range
VESD
Note: 1
Storage and Junction Temperature
Value
-40 to +150
Top
4
4
During the flyback with Vcc=±18V, the maximum output voltage (pin 4) is close to 72V, with respect to -Vcc
(pins 1, 2, 3, 18, 19, 20).
THERMAL DATA
Symbol
Parameter
Rth j-amb
Thermal resistance Junction to ambient
Value
Unit
70
°C/W
Pins 1, 2, 3, 18, 19, 20 are internally connected together and participate to heat evacuation.
4/8
2
STV9381
5
ELECTRICAL CHARACTERISTICS (refer to Figure 1 on page 3)
Tamb = 25°C unless otherwise specified, Vcc = ±12V, fvert=50Hz
Symbol
+Vcc
-Vcc
∆Vcc
Parameter
Positive supply range
Negative supply range
Maximum recommended difference
between +Vcc and – Vcc
Vccstart
Low Vcc detection
Iq
Iy
I13, I12
Quiescent supply current
Maximum vertical yoke current
Test Conditions
Min.
+10
-18
Input voltage = 0
Amplifier Input bias current
Typ.
Max.
+18
-10
Units
V
V
±4
V
±6.5
V
14
±1.5
mA
A
µA
-0.1
VOS
Output Offset voltage
Note 2
SVR
Supply voltage rejection
Flyback detection threshold
(positive slope)
Flyback detection threshold
(negative slope)
Switching frequency
Switching frequency operative range
Note 3
82
dB
V(14)
1.5
V
V(14)
0.5
V
Flythr
Flythf
Fsw
Fsw - op
Rfreq
Frequency controller resistor range
Rfreq = 10kΩ
Pin 10
-50
+50
mV
120
100
140
160
200
kHz
kHz
7
10
14
kΩ
Note: 2
Input voltage = 0, measured after the filter (e.g. accross the 470 nF filter capacitor)
Note: 3
Supply rejection of the positive or negative power supply. Vcc ripple =1Vpp, f=100Hz, measured on the sense
resistor.
5/8
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STV9381
6
PACKAGE MECHANICAL DATA
Dimensions
A
A1
A2
b
b1
b2
c
c1
D
6/8
3
Min.
0.381
2.921
0.381
0.356
1.397
0.203
0.203
26.035
Millimeters
Typ.
3.302
0.457
0.457
1.524
0.254
0.254
26.162
Max.
5.334
4.953
0.559
0.508
1.651
0.305
0.279
26.289
Min.
0.015
0.115
0.015
0.014
0.055
0.008
0.008
1.025
Inches
Typ.
0.130
0.018
0.018
0.060
0.010
0.010
1.030
Max.
0.210
0.195
0.022
0.020
0.065
0.012
0.011
1.035
Notes
3
3
8
4
STV9381
Dimensions
D1
E
E1
e
eA
eB
eC
L
N
Q1
Min.
0.762
7.62
6.096
Millimeters
Typ.
0.889
6.401
2.54
7.62
0.000
3.175
1.397
20
1.524
Max.
1.016
8.255
6.604
Min.
0.030
0.300
0.240
10.922
1.524
3.429
0.000
0.125
1.651
0.055
Inches
Typ.
0.035
0.252
0.100
0.300
Max.
0.040
0.325
0.260
0.430
0.060
0.135
20
0.060
Notes
4
5
4
5
6
6
3
7
0.065
Note: 3
Dimensions A, A1 & L are measured with the package seated in JEDEC seating plane gauge GS-3
Note: 4
Dimensions D, D1 and E1 are to be measured at maximum material condition but do not include mold flash or
protrusions. Mold flash or protrusions shall not exceed 0.010 inch /0.254 mm
Note: 5
E and eA measured with the leads constrained to be perpendicular to datum -c-
Note: 6
eB and eC are measured at the lead tips with the leads unconstrained
Note: 7
N is the maximum of number of lead positions
Note: 8
b2 maximum dimension does not include DAMBAR protrusions. DAMBAR protrusions shall not exceed
0.010inch / 0.25mm
7/8
STV9381
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for
the consequences of use of such information nor for any infringement of patents or other rights of third parties which may
result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components
in life support devices or systems without the express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
ÿ2003 STMicroelectronics - All Rights Reserved.
2
Purchase of I C Components by STMicroelectronics conveys a license under the Philips I2C Patent. Rights to use these
components in an I2C system is granted provided that the system conforms to the I2C Standard Specification as defined
by Philips.
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