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| Multimedia ICs High-voltage control circuit for CRT displays BA9756 / BA9756FS The BA9756 / BA9756FS are LSIs that control CRT anode voltage in multi-scan monitors and similar devices, using a chopper-type voltage control circuit. The internal sawtooth wave generator circuit uses automatic gain control (AGC) to enable coverage of a wide range from 30kHz to over 150kHz. The BA9756FS is equipped with an internal high-precision voltage source featuring an output voltage precision of 0.7%. *Applications HDTVs, others CRT displays, *Featureschopper-type voltage control circuit. 1) Internal 2) Internal buffer circuit enables direct drive of power MOSFET for output drive. 3) Internal high-precision voltage source offers output voltage precision of 0.7% (1.5% for the BA9756). *Absolute maximum ratings (Ta = 25C) Parameter Power supply voltage 1 Power supply voltage 2 Power dissipation BA9756 BA9756FS Topr Tstg Symbol VCC1 VCC2 Pd Limits 18 20 9501 7502 - 25 ~ + 80 - 55 ~ +125 Unit V V mW C C Operating temperature Storage temperature 1 Reduced by 9.5mW for each increase in Ta of 1C over 25C. 2 When mounted on a 70mm x 70mm x 1.6mm glass epoxy board. Reduced by 7.5mW for each increase in Ta of 1C over 25C. *Recommended operating conditions (Ta = 25C) Parameter Power supply voltage 1 Power supply voltage 2 Symbol VCC1 VCC2 Min. 11 11 Typ. -- -- Max. 17 17 Unit V V 1 Multimedia ICs BA9756 / BA9756FS *Block diagram BA9756 14 VCC1 13 12 DTC 11 VCC2 10 9 8 Buffer - 1 + + - BA9756FS 20 VCC1 19 18 17 16 15 VCC2 14 13 12 11 1 2 2 + - + SAW GEN. 2 3 SAW GEN. 3 4 5 M/M 9.0V REF GND 4 5 6 7 Buffer + + - M/M 9.0V REF GND 6 7 8 9 10 Multimedia ICs Pin descriptions *Items in parentheses are for the BA9756. Pin No. 1 2 3 4 (3) 5 6 (4) Pin name ERRIN This is the recovery voltage input pin. (error amplifier + input) AGC (constant for AGC) N.C. SAWOUT (constant for sawtooth wave) N.C. Function BA9756 / BA9756FS Capacitance should be determined taking into consideration the linearity at the minimum oscillation frequency, and the response time when the frequency changes. See1. This is the output pin for optimized sawtooth waves, based on the maximum oscillation frequency. fMax120kHz C = 1000pF fMax100kHz C = 1200pF fMax 80kHz C = 1500pF fMax 60kHz C = 2000pF See1. MMCR A charging resistance of 4.7k or higher should be used. (delay constant for The threshold level is 4.5V. monostable multivibrator) HDIN (Hd pulse input) VREF9 (Ref 9V output) N.C. GND (Signal GND) GND (Power GND) PWMOUT (PWM output) N.C. VCC2 (Power VCC) DTC IN (dead time control input) The threshold level is approximately 2.1V. An output deviation of 0.7% is assured through trimming ( 1.5% for the BA9756). See1. This may be shared with the power GND, but make sure sufficiently stable grounding is provided. This may be shared with the signal GND, but make sure sufficiently stable grounding is provided. If a voltage of less than GND or higher than VCC is applied because of external back electromotive force, a protective diode should be inserted (2). If the protector circuit and thermal shutdown circuit are tripped, output is fixed at high (VCC) level. See1. A decoupling capacitor should be positioned in the vicinity of this pin. The voltage input to this pin enables restriction of the PWM output duty. The duty control is between 0V and 9V, and approximately 0% to 100% is enabled. At 0V, however, restrictions apply. The minimum pulse width for the PWM is 0.85s (Typ. at 90kHz). 7 (5) 8 (6) 9 10 (7) 11 (8) 12 (9) 13 14 (10) 15 (11) 16 (12) 17 18 19 (13) ERROUT This is the output pin for the error amplifier. (error amplifier output) N.C. N.C. See1. See1. ERRREF This is the input pin for the reference voltage. (error amplifier input) VCC1 20 (14) A decoupling capacitor should be positioned in the vicinity of this pin. (signal VCC) 1 N.C. pin processing 2 In order to boost the thermal effect of the IC, we recommend connecting this to the GND or to an adjacent pin. 11 (8) 12 (9) 14 (10) VCC2 + TO FET gate 3 Multimedia ICs BA9756 / BA9756FS *Input /inoutput circuits are for the BA9756. Items parentheses VCC VCC VCC 1 ERRIN 2 4 (3) AGC SAW OUT Fig.1 Fig.2 VCC VCC (5) 6 (4) 7 HDIN MMCR Fig.3 Fig.4 4 Multimedia ICs BA9756 / BA9756FS VCC (10) VCC2 14 8 (6) VREG9 12 (9) PWMOUT (8) 11 PGND Fig.5 Fig.6 VCC1 VCC VCC (14) 20 (13) (11) 15 DTC 19 ERRREF (7) 10 GND 16 (12) ERROUT Fig.7 Fig.8 Fig.9 5 Multimedia ICs BA9756 / BA9756FS *Electrical characteristics (unless otherwise noted, Ta = 25C, Vcc = 15V) Parameter Hd input pin Input high level voltage Input low level voltage Input high level current Input low level current Monostable multivibrator Delay time SAW GEN Output high level Output low level Output level f characteristic Reference voltage supply Output voltage Max. output current Output voltage thermal characteristics Thermal shutdown VREF9 Irmax9 TREF9 Tdow 8.865 8.937 10 -- 100 9.0 9.0 -- 0.1 -- 9.135 9.063 -- 0.3 -- V V mA % deg BA9756 BA9756FS -- Guaranteed design parameter at Ta = 250C, 2575C Guaranteed design parameter HOS LOS fSAW 8.0 0 150 9.0 0.15 200 10.0 0.35 -- V V kHz -- -- - 1dB drop from 30kHz Tdl 1.80 2.15 2.50 s R = 10k,C = 220pF VIH VIL IIH IIL 3.0 -- -- -- -- -- 360 0 VCC 1.5 530 -1 V V A A VIN = 15V -- -- -- Symbol Min. Typ. Max. Unit Conditions 6 Multimedia ICs Measurement circuits *(For the BA9756FS) Vs15 A 1 SW15 2 1 SW12 V BA9756 / BA9756FS Is12 2 20 VCC 19 18 17 16 15 14 13 12 11 Buffer + + - 1 2 + 6V 1 SW4 1 2 1 SWb 2 5k 100k SWa 2 1 19 50 SWc 2 1 SW16 Vs19 SW1 Vs1 1 100k V A V 1 - 1 2 50 SG1 50 Fig.11 - + SAW GEN. 3 4 5 Vs6 1500p M/M 9.0V ref GND 6 7 8 9 10 220 2 SW6 10k 1 220p VCC 2 3 1 SW7 A + V SW8 1 2 Is8 SG7 Fig.10 100k VCC 15 6.8k + 19 - 16 + 16 2 1 5.6k + + 10 Fig.12 7 Multimedia ICs BA9756 / BA9756FS *Measurement conditions (unless otherwise noted, Ta = 25C, Vcc = 15V) Parameter Circuit current Error amplifier Input bias current Input offset voltage Output low level voltage Output high level voltage Open voltage gain Max. output current PWM amplifier Output high level voltage Output low level voltage Rise time Fall time Min. pulse width HD input pin Input high level voltage Input low level voltage Input high level current Input low level current Monostable multivibrator Delay time SAW GEN Output high level Output low level Output level f characteristic Reference voltage supply Output voltage Max. output current Output voltage thermal characteristic Thermal shutdown VREF9 Irmax9 TREF9 Tdow -- -- -- -- 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Is = - 10mA Ta = 0C75C Ta = 75C 4 Symbol ICC -- 1 1 Switch position SW1 SW3 SW4 SW5 SW6 SW9 SW11 SW12 SWa SWb SWc 1 1 1 1 -- -- -- -- Conditions -- Vs1 = 6V, IB = - VIN x 10-5 Vs1 = 6V, VIO = (V12 - 6) x 10-2 Vs1 = 5V, Vs13 = 6V Vs1 = 7V, Vs13 = 6V SG1: f = 1kHz,VIN = 10mVP-P Vs1 = 7V, Vs13 = 6V 1 IB VIO VOL VOH AV IOM 1 1 1 1 -- 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 -- 2 1 2 2 2 -- 2 1 2 1 1 -- 1 1 2 1 1 -- 1 VOH VOL Tr Td TMin -- -- -- -- -- 2 2 1 1 1 1 1 1 1 1 1 1 3 3 3 1 1 1 1 1 2 2 1 1 1 2 2 1 1 1 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Vs3 = 6V,Vs11 = 5V, Is9 = - 100mA Vs3 = 6V,Vs11 = 7V, Is9 = 100mA SG5: f = 90kHz SG5: f = 90kHz SG5: f = 90kHz 2 2 2 VIH VIL IIH IIL -- -- -- -- 1 1 1 1 1 1 1 1 3 3 2 1 1 1 1 1 1 1 1 1 1 1 1 1 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- SG5: f = 90kHz SG5: f = 90kHz -- -- 2 2 Tdl -- 1 2 3 1 1 1 -- -- -- -- SG5: f = 90kHz, Vs4 = 9V 2 2 2 3 HOS LOS fsaw -- -- -- 1 1 1 1 1 1 3 3 3 1 1 1 1 1 1 1 1 1 -- -- -- -- -- -- -- -- -- -- -- -- SG5: f = 90kHz SG5: f = 90kHz SG5: f = 30kHz -- 1 The pin 12 output amplitude should be set to VO. AV = 20log (VO / VIN) [dB] 2 For the method by which the output waveform is determined, refer to Fig. 14. 3 An input frequency should be measured that produces a level of - 1dB for a high output level (HOS) for the sawtooth waveform at an input frequency of 4 The temperature is measured at the point where the temperature is raised to above Ta = 75C and the output level of pin 9 is high. 30kHz. 8 Multimedia ICs BA9756 / BA9756FS *Application example (BA9756FS) Hd in 10k 220F + 220pF 1500pF 1F + 10 GND 9 N.C. 8 7 6 5 N.C. 4 3 N.C. 2 1 REF 9.0V M/M SAW GEN. N.C. 11 12 13 14 15 16 15V + + +B HRC FBT Anode Voltage Note: N.C. pin processing In order to boost the thermal effect of the IC, we recommend connecting this to the GND or to an adjacent pin. + + N.C. 17 N.C. 18 Hd pulse Buffer - + - VCC 19 20 15V + Fig.13 9 Multimedia ICs Input / output waveforms BA9756 / BA9756FS 3.0V SG5 (Hd IN) 1.5V HOS (SAW OUT) LOS 100% 90% 50% (PWM OUT) 10% 0% Td Tdl TMin. Tr Fig.14 10 Multimedia ICs BA9756 / BA9756FS *External dimensions (Units: mm) BA9756 BA9756FS 19.4 0.3 14 8 6.5 0.3 8.7 0.2 20 7.8 0.3 5.4 0.2 11 1 0.51Min. 7 7.62 3.2 0.2 4.25 0.3 1 1.8 0.1 10 0.3 0.1 0.11 0.8 0.36 0.1 0.3Min. 0.15 2.54 0.5 0.1 0 ~ 15 DIP14 SSOP-A20 0.15 0.1 11 |
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