ETC STV9390

STV9390
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 2.2 APP
SUITABLE FOR DC COUPLING
APPLICATION
FEW EXTERNAL COMPONENTS
PROTECTION AGAINST LOW Vcc
SO20
ORDER CODE: STV9390
DESCRIPTION
Designed for monitors and TVs, the STV9390 is a
class-D vertical deflection booster assembled in
SO20 Package.
It operates with supplies up to +/- 18V, provides
up to 2.2 App output current to drive the yoke. The
internal flyback generator avoids the need for an
extra power supply.
PIN CONNECTION
+VCC
1
20
EAOUT
+VCC POW
2
19
IN+
-VCC POW
3
18
IN-
NC
4
17
SGND
-VCC
5
16
-VCC
6
15
-VCC
NC
7
14
FREQ
OUT
8
13
FEEDCAP
CFLY+
9
12
CFLY-
10
11
VREG
BOOT
-VCC
Version 2.0
September 2003
1/7
1
STV9390
1
PIN FUNCTIONS
Pin
Number
Name
1
+VCC
2
+VCCPOW
Positive power supply
3
-VCCPOW
Negative power supply
2
Function
Positive supply
4
NC
5
-VCC
Not connected
Negative supply
6
-VCC
Negative supply
7
NC
8
OUT
9
CFLY+
Flyback capacitor
10
CFLY-
Flyback capacitor
Not connected
PWM output
11
BOOT
Bootstrap capacitor
12
VREG
Internal voltage regulator
13
FEEDCAP
14
FREQ
Frequency setting resistor
15
-VCC
Negative supply
16
-VCC
Negative supply
17
SGND
Signal ground
Feed-back integrating capacitor
18
IN-
Error amplifier inverting input
19
IN+
Error amplifier non-inverting input
20
EAOUT
Error amplifier output
FUNCTIONAL DESCRIPTION
The STV9390 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.
2/7
2
Figure 1. Test and Application Circuit
+VCC
100nF
1000µF
100nF
1
-VCC
+VCC
2
+VCCPOW
STV9390
STV9390
VREG
-VCC
12
Flyback
detection
Vref
100nF
Flyback
generator
CFLY+
9
10
CFLYBACK
100µF
CFLYBOOT
IN+
19
1kΩ
IN -
Output
drive
Modulator
_
18
Input signal
Cboot
220nF
11
+
OUT
8
EAOUT
1mH
150Ω
470nF
20
10kΩ
1kΩ
150Ω
Deflect.
Yoke*
200Ω
Pins 5,6,15,16
13
17
SGND
14
FEEDCAP
470pF
4.7nF
560pF
3
FREQ
10kΩ
-VCC
-VCCPOW
100nF
1000µF
Sense
resistor
0.5Ω
-VCC
2
3/7
fvert = 50Hz
STV9390
* Deflection yoke characteristics: R = 5.5Ω, L = 7mH
STV9390
3
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
Tstg, Tj
Top
DC Supply Voltage
Storage and Junction Temperature
Operating Temperature Range
VESD
ESD Susceptibility - Human Body Model (100 pF discharge through
1.5 kΩ)
Iout
Output current
Vout
Maximum output voltage (pin 8) with respect to -Vcc
(pins 5, 6, 15, 16) and during flyback (see Note 1)
Note: 1
4
Parameter
Value
±20
V
-40 to +150
°C
0 to +70
°C
±2
kV
±1.6
A
80
V
During the flyback with Vcc=±18V, the maximum output voltage (pin 8) is close to 72V, with respect to -Vcc
(pins 5, 6, 15, 16).
THERMAL DATA
Symbol
Parameter
Rth j-amb
Thermal resistance Junction to ambient
Value
Unit
78
°C/W
Pins 5, 6, 15, 16 are internally connected together and participate to heat evacuation.
4/7
2
Unit
STV9390
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
Typ.
Max.
+18
-10
Units
V
V
±4
V
±6.5
V
14
±1.1
mA
A
Input voltage = 0
Note 2
Amplifier Input bias current
µA
-0.1
VOS
Output Offset voltage
Note 3
SVR
Supply voltage rejection
Flyback detection threshold
(positive slope)
Flyback detection threshold
(negative slope)
Integrated circuit
Dissipated power
Switching frequency
Switching frequency operative range
Note 4
82
dB
V(20)
1.5
V
V(20)
0.5
V
Note 5
0.9
W
Flythr
Flythf
Pd
Fsw
Fsw - op
Rfreq
Frequency controller resistor range
-50
Rfreq = 10kΩ
+50
mV
120
100
140
160
200
kHz
kHz
7
10
14
kΩ
Pin 14
Note: 2
The maximum vertical yoke current is dependent on ±VCC. The maximum current as function of ±VCC is
given in Table 1
Note: 3
Input voltage = 0, measured after the filter (e.g. accross the 470 nF filter capacitor)
Note: 4
Supply rejection of the positive or negative power supply. Vcc ripple =1Vpp, f=100Hz, measured on the sense
resistor.
Note: 5
Power dissipated in the circuit in the case of the application from Figure 1 and the current in the deflection
yoke adjusted to 2.2App. The corresponding power dissipated in the vertical deflection yoke is 2.25W.
Table 1. Maximum yoke current as function of ±VCC
Symbol
Unit
±VCC
±10 to 14
±15
±16
±17
±18
V
Iy
±1.1
±1.05
±1.0
±0.95
±0.85
A
5/7
2
STV9390
6
PACKAGE MECHANICAL DATA
A
A1
B
C
D
E
e
H
h
L
K
6/7
3
Min.
2.35
0.10
0.33
0.23
12.6
7.40
Millimeters
Typ.
Max.
2.65
0.30
0.51
0.32
13.00
7.60
Min.
0.96
0.004
0.015
0.009
0.504
0.296
10.65
0.75
1.27
8°
0.400
0.01
0.016
1.27
10.00
0.25
0.40
0°
Inches
Typ.
Max.
0.100
0.012
0.019
0.013
0.52
0.304
0.051
0.426
0.03
0.051
STV9390
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.
Purchase of I2C 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.
STMicroelectronics Group of Companies
Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States.
http://www.st.com
7/7
4