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. Applications •CRT displays and HDTV products •1)Features Internal chopper voltage controller. 3) Internal output voltage error detector. 4) Internal buffer circuit that directly drives power MOSFET for output drive. 2) Two internal high-precision power supplies, each with an output voltage precision of ±1%. •Absolute maximum ratings (Ta = 25°C) Parameter Symbol Limits Unit Applied voltage 1 VCC1 18∗1 Applied voltage 2 VCC2 20∗2 V Pd 600∗1 mW Operating temperature Topr – 25 ~ + 75 °C Storage temperature Tstg – 55 ~ + 125 °C Power dissipation ∗ ∗3 1 18pin ∗ V 2 3pin Reduced by 6.0mW for each increase in Ta of 1°C over 25°C. •Recommended operating voltage (Ta = 25°C) Parameter Symbol Limits Unit Applied voltage 1 VCC1 11 ~ 13 V Applied voltage 2 VCC2 11 ~ 16 V ∗ Used with condition VCC2 ⭌ VCC1 1 Multimedia ICs BA9755S •Block diagram GND 1 PWMOUT 2 GND Sig VCC 18 VCC 17 PROTOUT REF 9.0V 16 VREG9 REF 6.0V 15 VREG6 14 XREF 13 XRAYIN 12 ABLIN 11 PONDET 10 ERROUT Buffer PVCC 3 HDIN 4 MMCR 5 Power VCC M. M. 6 SAW GEN. AGC 7 AGC TYPE ERRIN 8 + SAWOUT ERRREF 2 9 – – + LATCH – + – + START Multimedia ICs BA9755S •Pin descriptions Pin No. Pin name 1 GND 2 PWMOUT 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. 3 PVCC Power supply for the power system. Place a decoupling capacitor in proximity to this pin. 4 HDIN HD pulse input. The input signal should be shorter than the rise time (µs). 5 MMCR 6 SAWOUT 7 AGC 8 ERRIN 9 ERRREF 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. 10 ERROUT Output of the error detection voltage. 11 PON DET 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. 12 ABLIN Beam protector input. When the protector is activated, the latch locks and PWM output is fixed at the low level. 13 XRAYIN X-ray protector input. When the protector is activated, the latch locks and PWM output is fixed at the low level. 14 XREF 15 VREG6 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 47µF bypass capacitor. 16 VREG9 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 10µF bypass capacitor. 17 PROTOUT 18 VCC Internal mono-multi time constant setting. Shifts the phase of the serrated wave. Use a charge resistance higher than 4.7kΩ. Serrated wave output. Adjust maximum capacity by changing maximum oscillation frequency. fMax. 120kHz→C = 1000p, fMax. 100kHz→C = 1200p fMax. 80kHz→C = 1500p, fMax. 60kHz→C = 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 X-ray protector's reference voltage. 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. 3 Multimedia ICs BA9755S •Input / output circuits VCC HDIN GND 11k PMWOUT 75k 4 PVCC 75k 1 2 3 37.5k 37.5k 5p 2k 20k MMCR SAWOUT AGC 5 6 7 VCC VCC 2k 5k 2k 1k 4k 2k 4k Ref 6V 7.5k 330k 50k 22.5k 3.5k ERRREF 99 30k ERROUT 10 VCC VCC 150 13k 1k ERRIN 8 4 1k 150 2k Multimedia ICs BA9755S PONDET ABLIN 12 12 11 Ref 6V VCC 10k 1k 1k 1k 4k XRAYIN XREF 13 14 VCC 1k 4k 1k 4k 50k VCC VCC VCC PROTOUT 1k 1k 20k 17 55 50k VREG9 ESD16 20 R23 VREG6 50 15 61.335k 74.45k 25k 20k 16 1960 760 960 380 20.01k 25k 10.01k VCC 18 295 144 590 200 5 Multimedia ICs BA9755S •Electrical characteristics (unless otherwise noted, Ta = 25°C, V CC Parameter Supply current 〈 Error amplifier 〉 Symbol ICC Min. — Input bias current IB — — 0 10 50 ±3 Typ. 13 = 12V) Max. 21 Unit mA Conditions – 45 – 250 nA S8, 9a, 9b, 9c = 2 ; Vs8, 9 = 0V ; IB8 (IB9) = V8 (V9) × 10 – 5 ±1 0.2 10.5 60 ±5 ±5 mV V V dB mA S9b, 9c = 3 ; VIO = V10 × 10 – 2 S9a, 9c = 2 ; Vs9 = 6V S9a, 9c = 2 ; Vs9 = 4V f = 1kHz, guaranteed performance S10 = 2 ; Vs10 = 12V, 0V S6 = 2 Input offset voltage Output voltage, Low Output voltage, High Open loop gain Maximum output current 〈 Protector 〉 Input bias current VIO VOL VOH Av IOM IB — 0 Input offset voltage VIO — ±1 Common mode input voltage VICR 0 — 10 V Verify: pin 17 = LO when Vs11 (Vs12 = Vs11 + 0.5V) = 0, 10V Verify: pin 17 = LO when Vs13 (Vs14 = Vs13 + 0.5V) = 0, 10V Output voltage, High Output voltage, Low 〈 PWM amplifier 〉 Output voltage, High level Output voltage, Low level Rise time Fall time VOH VOL 10.0 — 11.0 1.0 — 2.0 V V S17 = 2 ; Vs12 = 5V ; Is17 = – 50µA S17 = 2 ; Is17 = 3mA VOH VOL Tr Td 9.5 — — — 10.5 1 — — — 2 60 40 V V ns ns S2 = 2 ; Is2 = – 100mA S2 = 2 ; Vs8 = 3V ; Is2 = 100mA Guaranteed performance Guaranteed performance Minimum pulse width TMin. 0.5 — 1.3 µs S4 = 2 ; Vs8 = 0V ; SG4 = p1 (f = 90kHz) ; threshold = 5V 〈 Hd input pin 〉 Input voltage, High level Input voltage, Low level Input current, High level Input current, Low level 〈 Monomulti 〉 VIH VIL IOH IOL 4.0 — — — — — 285 0 Vcc 1.5 420 –1 V V µA µA Verify oscillation of SAW GEN. S4 = 2 ; Vs8 = 0V ; SG4 = p1 Verify oscillation of SAW GEN. S4 = 2 ; Vs8 = 0V ; SG4 = p1 Vs4 = 12V — Delay time Tdl 0.3 0.5 0.8 µs S4 = 2 ; Vs8 = 0V ; SG4 = p1 ; (R = 4.7kΩ, C = 0pF)∗1 〈 SAW GEN 〉 Output level, High Output level, Low HOS LOS 8.0 0 9.0 0.15 10.0 0.35 V V HI level of S4 = 2 ; SG4 = p1 ; 6pin output wave form LO level of S4 = 2 ; SG4 = p1 ; 6pin output wave form Output frequency characteritic FSAW 150 200 — kHz 〈 Reference voltage source 1 〉 Output voltage Maximum output current Output voltage temperature characteristics VREF9 IRMax. 8.91 10 9.0 — 9.09 — V mA S15 = 2 ; Is = 10mA ; TVREF – 0.7 — 0.7 % Ta = – 25°C ~ + 75°C VREF6 IRMax. 5.94 10 6.0 — 6.06 — V mA S15 = 2 ; Is = 10mA ; TVREF – 0.7 — 0.7 % Ta = – 25°C ~ + 75°C Tdow 100 — — deg 〈 Reference voltage source 2 〉 Output voltage Max. output current Output voltage temp. characteristics Thermal shutdown 0.5 — — ±7 – 50 nA Vs11, 12, 13, 14 = 0V ±5 mV Verify: pin 17 = LO→HI when Vs12 = 6.005V→5.995V Verify: pin 17 = LO→HI when Vs13 = 5.995V→6.005V ∗1 Time between rise of pin 4 input waveform and rise of pin 2 output waveform 6 S4 = 2, SG4 = input frequency 1 dB lower than HI level of pin 6 output waveform when SG4 = p2 — — — Multimedia ICs BA9755S •Measurement circuit VCC A 15mA IS17 V 1 15mA IS16 IS15 1 1 2 S17 2 S16 + 17 V 6V 5V 7V 6V VS14 VS13 VS12 VS11 A A A A 14 13 12 11 A V A A 18 2 S10 2 S15 V + Is10 1 16 15 10 REF 6.0V – + – REF 9.0V + Sig VCC LATCH + START – SAW GEN. AGC TYPE GND –+ M. M. Power VCC 1 2 3 9V 4 5 6 7 8 9 4.7k S2 V 1 2 1S2 V 1 VS4 4V A 1200p S4 2 SG4 V 2 S6 1 V V VS6 4V 1µ Universal counter Universal Peak counter voltmeter V V 2 2 1 100k 100k 1 S9a S8 S9c 50 50 1 2 3 S9b VS8 3 5V 5k 2 1 VS9 Fig. 1 SG4 input pulse p1 4.0V 1.5V 5µs 11µs p2 4.0V 1.5V 5µs 33µs 7 Multimedia ICs BA9755S •Application example PROT OUT VCC 12V + + + 18 17 16 15 14 13 12 11 10 – – + + Sig VCC REF 6.0V REF 9.0V LATCH + START – – + Power VCC GND 1 SAW GEN. AGC TYPE M. M. Buffer 2 3 4 5 6 7 8 9 + 12V +B Hd HRC Hd pulse Fig. 2 8 Anode Voltage FBT Multimedia ICs BA9755S 4 3 2 1 0 50 100 150 200 250 1.3 12 PWM Min. PULSE WIDTH : TMin. (µs) 5 LOW LEVEL OUTPUT VOLTAGE : VOL (V) HIGH LEVEL OUTPUT VOLTAGE : VOH (V) •Electrical characteristic curves 11 10 9 8 7 0 – 50 OUTPUT CURRENT : IO (mA) – 150 – 200 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 – 50 – 250 OUTPUT CURRENT : IO (mA) Fig. 3 PWM HIGH output voltage vs. output current Fig. 4 PWM LOW output voltage vs. output current 9.08 6.08 9.06 0.7 0.6 0.5 0.4 0.3 0.2 OUTPUT VOLTAGE : VREF9 (V) 6.10 6.06 6.04 6.02 6.00 5.98 5.96 5.94 5.92 0.1 – 50 – 25 0 + 25 + 50 + 75 + 100 TEMPERATURE : Ta (°C) Fig. 6 PWM minimum delay time vs. temperature 0 + 25 + 50 + 75 + 100 Fig. 5 PWM minimum pulse width vs. temperature 0.9 0.8 – 25 TEMPERATURE : Ta (°C) 1.0 OUTPUT VOLTAGE : VREF 6 (V) PWM Min. DELAY TIME : Tdl (µs) – 100 1.2 9.04 9.02 9.00 8.98 8.96 8.94 8.92 8.90 – 50 – 25 0 + 25 + 50 + 75 + 100 – 50 – 25 0 + 25 + 50 + 75 + 100 TEMPERATURE : Ta (°C) TEMPERATURE : Ta (°C) Fig. 7 Output voltage (6V reference voltage) vs. temperature Fig. 8 Output voltage (9V reference voltage) vs. temperature SAW OUT HIGH PEAK LEVEL : HOS (V) 9.6 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 10 1 9 3.4 ± 0.2 0.51Min. 3.95 ± 0.3 6.5 ± 0.3 18 7.62 0.3 ± 0.1 1.778 0.5 ± 0.1 SDIP18 10 0° ~ 15°