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Multimedia ICs
High voltage controller for CRT displays
BA9755S
The BA9755S is an LSI chip with a chopper voltage controller designed to control the anode voltage of multiscan monitors and other CRTs. There are two internal high-precision power supplies, each with an output voltage precision of 1%. Using a high-precision voltage detection resistor makes it possible to set anode voltage without adjustment. Other internal components include an output voltage error detector and an overcurrent detector, which detects overcurrent when the power is turned on.
*Applicationsand HDTV products CRT displays *Featureschopper voltage controller. 1) Internal
2) Two internal high-precision power supplies, each with an output voltage precision of 1%. 3) Internal output voltage error detector. 4) Internal buffer circuit that directly drives power MOSFET for output drive.
*Absolute maximum ratings (Ta = 25C)
Parameter Applied voltage 1 Applied voltage 2 Power dissipation Operating temperature Storage temperature Symbol VCC1 VCC2 Pd Topr Tstg Limits 181 202 6001 - 25 ~ + 75 - 55 ~ + 125 Unit V V mW C C
3
1 18pin
2 3pin
Reduced by 6.0mW for each increase in Ta of 1C over 25C.
*Recommended operating voltage (Ta = 25C)
Parameter Applied voltage 1 Applied voltage 2 Symbol VCC1 VCC2
VCC2 VCC1
Limits 11 ~ 13 11 ~ 16
Unit V V
Used with condition
1
Multimedia ICs
BA9755S
*Block diagram
GND 1 GND Sig VCC 18 VCC PWMOUT 2 Buffer PVCC 3 Power VCC REF 9.0V REF 6.0V M. M. LATCH 14 XREF 17 PROTOUT
-+
16
VREG9
HDIN
4
15
VREG6
MMCR
5
SAWOUT
6
SAW GEN. AGC TYPE
- +
13
XRAYIN
AGC
7
- +
START
12
ABLIN
ERRIN
8
11
PONDET
ERRREF
9
+ -
10
ERROUT
2
Multimedia ICs
BA9755S
*Pin descriptions
Pin No. 1 Pin name GND Function Ground This is the common ground for the small signal system and the power system, and so requires a stable ground suitable for common impedance. PWM wave output Output is fixed at the low level when the protector circuit or thermal shutdown circuit is activated. Power supply for the power system. Place a decoupling capacitor in proximity to this pin. HD pulse input. The input signal should be shorter than the rise time (s). Internal mono-multi time constant setting. Shifts the phase of the serrated wave. Use a charge resistance higher than 4.7k. Serrated wave output. Adjust maximum capacity by changing maximum oscillation frequency. fMax. 120kHzC = 1000p, fMax. 100kHzC = 1200p fMax. 80kHzC = 1500p, fMax. 60kHzC = 2000p AGC time constant setting. Set capacity according to the linearity of the minimum oscillation frequency and the response time during frequency change. Input of the error amplifiers feedback voltage. Input of the error amplifiers feedback voltage. When this voltage is given a time constant, the IC soft-starts when the power is turned on. Output of the error detection voltage. Setting the time constant for the protector output suppression time and input of the beam protectors reference voltage. This stops the protectors until the system stabilizes. The latch can be unlocked by raising the voltage of this pin above 4.5V. Beam protector input. When the protector is activated, the latch locks and PWM output is fixed at the low level. X-ray protector input. When the protector is activated, the latch locks and PWM output is fixed at the low level. Input of the X-ray protector's reference voltage. Reference voltage output (6V). Output variation is guaranteed to be 1% or less (with trimming). This circuit is completely separate from the 9V system. Output is stopped when the thermal shutdown circuit is activated. Use a 47F bypass capacitor. Reference voltage output (9V). Output variation is guaranteed to be 1% or less (with trimming). This circuit is completely separate from the 6V system. Output is stopped when the thermal shutdown circuit is activated. Use a 10F bypass capacitor. Protector output. Output changes to the high level when the protector circuit or thermal shutdown circuit is activated. Power supply for the signal system. Place a decoupling capacitor in proximity to this pin.
2 3 4 5
PWMOUT PVCC HDIN MMCR
6
SAWOUT
7
AGC
8 9 10 11
ERRIN ERRREF ERROUT PON DET
12 13 14
ABLIN XRAYIN XREF
15
VREG6
16
VREG9
17 18
PROTOUT VCC
3
Multimedia ICs
BA9755S
*Input / output circuits
VCC
HDIN GND
1
75k
PMWOUT
2
11k
PVCC
3
4
75k 37.5k 5p 37.5k
2k 20k
MMCR
5
SAWOUT
6
AGC
7
VCC
VCC
5k 1k 4k 2k 4k Ref 6V
2k
2k
7.5k 50k 330k
22.5k 3.5k 30k
ERRREF 9 9
ERROUT 10
VCC
VCC
150 13k 1k 2k
ERRIN
8
1k 150
4
Multimedia ICs
BA9755S
PONDET
11
ABLIN 12 12
XRAYIN
13
XREF
14
Ref 6V
VCC
1k
1k
1k
1k
VCC
1k
10k
4k
4k
4k
50k
VCC VCC
1k
VCC
1k
PROTOUT
17
55
20k
50k
20 R23 50
VREG6
15
61.335k 760 380
VREG9 ESD16
16
20k
74.45k 1960 960
25k
20.01k 295 590
25k
10.01k 144 200
VCC 18
5
Multimedia ICs
BA9755S
*Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 12V)
Parameter Supply current Error amplifier Input bias current Input offset voltage Output voltage, Low Output voltage, High Open loop gain Maximum output current Protector Input bias current Input offset voltage Common mode input voltage Output voltage, High Output voltage, Low PWM amplifier Output voltage, High level Output voltage, Low level Rise time Fall time Minimum pulse width Hd input pin Input voltage, High level Input voltage, Low level Input current, High level Input current, Low level Monomulti Delay time SAW GEN Output level, High Output level, Low Output frequency characteritic Reference voltage source 1 Output voltage Maximum output current Output voltage temperature characteristics Reference voltage source 2 Output voltage Max. output current Output voltage temp. characteristics Thermal shutdown Symbol ICC Min. -- Typ. 13 Max. 21 Unit mA Conditions S6 = 2 S8, 9a, 9b, 9c = 2 ; Vs8, 9 = 0V ; IB8 (IB9) = V8 (V9) x 10 - 5 S9b, 9c = 3 ; VIO = V10 x 10 - 2 S9a, 9c = 2 ; Vs9 = 6V S9a, 9c = 2 ; Vs9 = 4V f = 1kHz, guaranteed performance S10 = 2 ; Vs10 = 12V, 0V Vs11, 12, 13, 14 = 0V Verify: pin 17 = LOHI when Vs12 = 6.005V5.995V Verify: pin 17 = LOHI when Vs13 = 5.995V6.005V Verify: pin 17 = LO when Vs11 (Vs12 = Vs11 + 0.5V) = 0, 10V Verify: pin 17 = LO when Vs13 (Vs14 = Vs13 + 0.5V) = 0, 10V S17 = 2 ; Vs12 = 5V ; Is17 = - 50A S17 = 2 ; Is17 = 3mA S2 = 2 ; Is2 = - 100mA S2 = 2 ; Vs8 = 3V ; Is2 = 100mA Guaranteed performance Guaranteed performance S4 = 2 ; Vs8 = 0V ; SG4 = p1 (f = 90kHz) ; threshold = 5V IB VIO VOL VOH Av IOM IB VIO VICR VOH VOL VOH VOL Tr Td TMin. -- -- 0 10 50 3 -- -- 0 10.0 -- 9.5 -- -- -- 0.5 - 45 1 0.2 10.5 60 5 0 - 250 nA mV V V dB mA nA mV V V V V V ns ns s
5
0.5 -- -- 7 - 50
1
-- 11.0 1.0 10.5 1 -- -- --
5
10 -- 2.0 -- 2 60 40 1.3
VIH VIL IOH IOL
4.0 -- -- --
-- -- 285 0
Vcc 1.5 420 -1
V V A A s
Verify oscillation of SAW GEN. S4 = 2 ; Vs8 = 0V ; SG4 = p1 Verify oscillation of SAW GEN. S4 = 2 ; Vs8 = 0V ; SG4 = p1 Vs4 = 12V -- S4 = 2 ; Vs8 = 0V ; SG4 = p1 ; (R = 4.7k, C = 0pF)1 HI level of S4 = 2 ; SG4 = p1 ; 6pin output wave form LO level of S4 = 2 ; SG4 = p1 ; 6pin output wave form S4 = 2, SG4 = input frequency 1 dB lower than HI level of pin 6 output waveform when SG4 = p2 -- S15 = 2 ; Is = 10mA ; Ta = - 25C ~ + 75C
Tdl
0.3
0.5
0.8
HOS LOS FSAW
8.0 0 150
9.0 0.15 200
10.0 0.35 --
V V kHz
VREF9 IRMax. TVREF
8.91 10 - 0.7
9.0 -- --
9.09 -- 0.7
V mA
%
V mA
VREF6 IRMax. TVREF Tdow
5.94 10 - 0.7 100
6.0 -- -- --
6.06 -- 0.7 --
-- S15 = 2 ; Is = 10mA ; Ta = - 25C ~ + 75C --
%
deg
1 Time between rise of pin 4 input waveform and rise of pin 2 output waveform
6
Multimedia ICs
BA9755S
*Measurement circuit
VCC 15mA IS17 1 2 S17
+
15mA IS15 1 2 S15
+
A
IS16 1 2 S16
Is10 1 2 S10 6V VS14 5V VS13 7V VS12 6V VS11
V
V A
V A 15
A
A
A
A
V
A
18 Sig VCC
17
16
14
13
12
11
10
REF 9.0V
REF 6.0V
-
LATCH
+
- -+
M. M. GND 1 2 Power VCC 3 V
1 VS4 4V
4 A
9V 4.7k
5
S2
1200p S4 2 SG4
V1
V
2 1S2
Universal counter
Fig. 1
SG4 input pulse
p1 4.0V 1.5V 5s 11s p2 4.0V 1.5V 5s 33s
-
+
+
START 8
SAW GEN. AGC TYPE
6
7
9
2 S6
1
V
1
V
V
V
VS6 4V
Universal Peak counter voltmeter
2 2 1 100k 100k 1 S9a S8 S9c 50 50 123 S9b VS8 5V 3 21 VS9 5k
7
Multimedia ICs
BA9755S
*Application example
PROT OUT VCC 12V
+ +
+
18 Sig VCC
17
16
15
14
13
12
11
10
REF 9.0V
REF 6.0V
LATCH
+
-
M. M. SAW GEN. AGC TYPE
GND 1 2
Power VCC 3 4 5 6 7 8 9
+
12V
+B
Hd
HRC
Anode Voltage FBT
Hd pulse
Fig. 2
8
-+
Buffer
-
-
+
+
START
Multimedia ICs
BA9755S
*Electrical characteristic curves
HIGH LEVEL OUTPUT VOLTAGE : VOH (V) LOW LEVEL OUTPUT VOLTAGE : VOL (V) 5 12 PWM Min. PULSE WIDTH : TMin. (s) 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 - 50 - 25 0 + 25 + 50 + 75 + 100 4 11 3 10
2
9
1
8
0
50
100
150
200
250
7 0
- 50
- 100
- 150
- 200
- 250
OUTPUT CURRENT : IO (mA)
OUTPUT CURRENT : IO (mA)
TEMPERATURE : Ta (C)
Fig. 3 PWM HIGH output voltage vs. output current
Fig. 4 PWM LOW output voltage vs. output current
Fig. 5 PWM minimum pulse width vs. temperature
1.0 PWM Min. DELAY TIME : Tdl (s) 0.9 OUTPUT VOLTAGE : VREF 6 (V) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 - 50 - 25 0 + 25 + 50 + 75 + 100
6.10 6.08 6.06 6.04 6.02 6.00 5.98 5.96 5.94 5.92 - 50 - 25 0 + 25 + 50 + 75 + 100 OUTPUT VOLTAGE : VREF9 (V)
9.08 9.06 9.04 9.02 9.00 8.98 8.96 8.94 8.92 8.90 - 50 - 25 0 + 25 + 50 + 75 + 100
TEMPERATURE : Ta (C)
TEMPERATURE : Ta (C)
TEMPERATURE : Ta (C)
Fig. 6 PWM minimum delay time vs. temperature
Fig. 7 Output voltage (6V reference voltage) vs. temperature
Fig. 8 Output voltage (9V reference voltage) vs. temperature
9.6 SAW OUT HIGH PEAK LEVEL : HOS (V) 9.4 9.2 9.0 8.8 8.6 8.4 8.2 8.0 7.8 10 20 30 50 70 100 200 300
FREQUENCY : f (kHz)
Fig. 9 SAW H peak vs. frequency
9
Multimedia ICs
BA9755S
*External dimensions (Units: mm)
19.4 0.3 18 10 6.5 0.3 0.51Min. 3.95 0.3 1 9 7.62
3.4 0.2
0.3 0.1
1.778
0.5 0.1
0 ~ 15
SDIP18
10

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