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BA9756FS
Multimedia ICs
High-voltage control circuit for CRT displays
BA9756FS
The BA9756FS is 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 CRT displays, HDTVs, others !Block diagram
20 VCC1 19 18 17 16 15 VCC2 14 13 12 11
1
2
!Absolute maximum ratings (Ta=25C)
Parameter Power supply voltage 1 Power supply voltage 2 Power dissipation Operating temperature Storage temperature Symbol VCC1 VCC2 Pd Topr Tstg Limits 18 20 750*1 - 25~+80 - 55~+125 Unit V V mW C C
*1 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
+
SAW GEN. 3 4 5
-
!Features 1) Internal chopper-type voltage control circuit. 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%.
Buffer
+ +
-
M/M
9.0V REF
GND 6 7 8 9 10
BA9756FS
Multimedia ICs
!Pin descriptions
Pin No. 1 2 3 4 5 6 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. Capacitance should be determined taking into consideration the linearity at the minimum oscillation frequency, and the response time when the frequency changes. See*1. 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 See*1. Function
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. See*1. 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. See*1. 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 8 9 10 11
12
13 14
15
16 17 18 19 20
ERROUT This is the output pin for the error amplifier. (error amplifier output) N.C. N.C. See*1. See*1.
ERRREF This is the input pin for the reference voltage. (error amplifier input) VCC1 A decoupling capacitor should be positioned in the vicinity of this pin. (signal VCC)
*1 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.
*2
11
12
14
VCC2
+ TO FET gate
BA9756FS
Multimedia ICs
!Input / output circuits
VCC VCC
VCC
1
ERRIN
2
4
AGC
SAW OUT
Fig.1
Fig.2
VCC
VCC
7 6 HDIN
MMCR
Fig.3
Fig.4
BA9756FS
Multimedia ICs
VCC VCC2 14
8 VREG9
12 PWMOUT
11 PGND
Fig.5
Fig.6
VCC1 VCC VCC 20
19 15 DTC ERRREF
10 GND 16
ERROUT
Fig.7
Fig.8
Fig.9
BA9756FS
Multimedia ICs
!Electrical characteristics (unless otherwise noted, Ta=25C, Vcc=15V)
Parameter Input high level voltage Input low level voltage Input high level current Input low level current Delay time Output high level Output low level Output level f characteristic Output voltage Max. output current Output voltage thermal characteristics Thermal shutdown VREF9 Irmax9 TREF9 Tdow 8.937 10 100 9.0 0.1 9.063 0.3 V mA % deg -- Guaranteed design parameter at Ta = 250C, 2575C Guaranteed design parameter Fig.10 Fig.10 Fig.10 Fig.10 HOS LOS fSAW 8.0 0 150 9.0 0.15 200 10.0 0.35 V V kHz -1dB drop from 30kHz Fig.10 Fig.10 Tdl 1.80 2.15 2.50 s R = 10k,C = 220pF Fig.10 VIH VIL IIH IIL 3.0 360 0 VCC 1.5 530 -1 V V A A VIN = 15V Fig.10 Fig.10 Fig.10 Fig.10 Symbol Min. Typ. Max. Unit Conditions Test Circuit
BA9756FS
Multimedia ICs
!Measurement circuits
Vs15 A 1 SW15 2 1 SW12 V 2 Is12
20 VCC
19
18
17
16
15
14
13
12
11
Buffer
SAW GEN.
M/M
9.0V ref
GND 1 2 3 4 5 6 7 8 9 10
+
220 1 SW4 1 2 Vs6 1500p 10k 1 220p VCC 2 3 2 SW6 1 SW7 A
+
6V
V
SW8 1 2 Is8
SG7
Fig.10
1 SWb
2
5k
100k
100k SWa 2 1 19 50 SWc 2 1 SW16 Vs19 SW1 Vs1 1 100k V A V 16 1 2
VCC 15 6.8k
+
19 16
1 5.6k
+
10
2 50
1
SG1
50
Fig.11
Fig.12
BA9756FS
Multimedia ICs
!Measurement conditions (unless otherwise noted, Ta=25C, Vcc=15V)
Parameter Circuit current Input bias current Input offset voltage Output low level voltage Output high level voltage Open voltage gain Max. output current Output high level voltage Output low level voltage Rise time Fall time Min. pulse width Input high level voltage Input low level voltage Input high level current Input low level current Delay time Output high level Output low level Output level f characteristic 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
*2 *2 *3
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 x10-5 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
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 = 0C 75 C Ta = 75C
*4
*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 30kHz. *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.
BA9756FS
Multimedia ICs
!Application example
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
BA9756FS
Multimedia ICs
Input / output waveforms
3.0V
SG5 (Hd IN) 1.5V
HOS
(SAW OUT)
LOS
100% 90%
50% (PWM OUT) 10% 0%
Td
Tdl
TMin.
Tr
Fig.14
!External dimensions (Units: mm)
BA9756FS
8.7 0.2 20 11
7.8 0.3
5.4 0.2
1
10
1.8 0.1
0.11
0.8
0.36 0.1
0.3Min. 0.15
SSOP-A20
0.15 0.1

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