BA9756FS

Multimedia ICs

!Pin descriptions

11

12

13

15

19

14

16

17

20

In order to boost the thermal effect of the IC, we recommend connecting this to the GND or to an adjacent pin.

GND

(Power GND)

This may be shared with the signal GND, but make sure sufficiently stable grounding

is provided.

A decoupling capacitor should be positioned in the vicinity of this pin.

N.C.

DTC IN

(dead time

control input)

ERRREF

(error amplifier input)

PWMOUT

(PWM output)

ERROUT

(error amplifier output)

N.C.

This is the input pin for the reference voltage.

This is the output pin for the error amplifier.

18

N.C.

A decoupling capacitor should be positioned in the vicinity of this pin.

level.

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 0.85

µs (Typ. at 90kHz).

11

12

14

TO FET gate

+

Pin No.

Pin name

Function

1

2

3

5

9

4

6

7

8

10

ERRIN

(error amplifier + input)

This is the recovery voltage input pin.

Capacitance should be determined taking into consideration the linearity at the minimum

oscillation frequency, and the response time when the frequency changes.

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

N.C.

N.C.

N.C.

AGC

(constant for AGC)

SAWOUT

(constant for

sawtooth wave)

MMCR

(delay constant for

monostable multivibrator)

HDIN

(Hd pulse input)

VREF9

(Ref 9V output)

GND

(Signal GND)

A charging resistance of 4.7k

Ω or higher should be used.

The threshold level is 4.5V.

The threshold level is approximately 2.1V.

An output deviation of ± 0.7% is assured through trimming.

This may be shared with the power GND, but make sure sufficiently stable grounding

is provided.