Ищу datasheet на OZ9967

16-08-2016 21:56

Ищу datasheet на OZ9967, не каталог производителя!

17-08-2016 19:40

ВашЭлектрик писал:

не каталог производителя!

Схема с её участием тоже не устраивает?

17-08-2016 20:16

Спасибо Доктор, схемы есть, штуки четыре точно.

17-08-2016 20:45

ВашЭлектрик писал:

Ищу datasheet на OZ9967

Для нормального даташита, ещё время не подошло (к себе не применять!). Пока, учим китайский улыбка

17-08-2016 21:13

segor, спасибо!

17-08-2016 21:50

ВашЭлектрик писал:

Ищу datasheet на OZ9967

segor писал:

учим китайский

или английский ...
OZ9967:
1)high-frequency boost converter
2) 6-channel current balance constant control
3) to achieve external and internal PWM dimming control
4) input undervoltage lockout
5) the Mosfet overcurrent protection
6) the LED short-circuit protection
) LED overcurrent protection
8) open LED protection
9) diode open circuit protection
10) output short circuit protection

pin function definitions:

of Pin1-Pin11, Pin28: LED current detection and appropriate compensation feedback . LED current is set as follows:

Pin12: Power Vcc
Pin16 for the signal ground.

Pin13: step-up drive, the drive voltage of 5V.
Pin14 : chip internal 5V reference voltage output.

Pin15: In order to boost the drive signal frequency is set sawtooth for the 0-1.7V:

Pin17 the Mosfet peak current detection when that point voltage reaches 0.5V, the chip will think that the the Mosfet overcurrent and turn off the drive signal to resume until the next cycle. Under normal operating conditions, the point voltage 0 2 0 3 V or so.
Pin18: chip power supply input operating range 6V ~ 40V.
Pin19 : input, start, when the signal is higher than 2V chips below 0.8V chip stop working. Pin20 of : soft-start and loop compensation.
Pin21 : internal PWM dimming frequency setting.
was elected with an external PWM dimming, the Pin set at about 1V voltage divider.

Pin22: input undervoltage lockout, when the Pin voltage is below 1.4V, the chip stops working, when the voltage exceeds 1.5V, the chip back to work, through a resistor divider network to set the input voltage .

Pin23: dimming. Acceptable linear voltage to the internal PWM dimming, the linear input voltage greater than 1.5V for 100% of the maximum brightness is less than 0.1V 0% of the minimum brightness dimming frequency is set by Pin21. If you want to achieve external PWM dimming, you can simply set the Pin21 is about 1V, input 0V to 3.3V PWM signal to an external PWM dimming, brightness follow the change of the input PWM duty cycle to adjust.

Pin24: status output, under normal operating conditions, the Pin is high impedance signal, when the motherboard LED appear open and short circuits exception of the Pin will output a low signal, the Pin can be used as to exception alerts signal or as a protective action signal.
Pin25 : timing, with the the Pin26 work.

Pin26: overvoltage detection, through the voltage divider to sense the output voltage, the boost driving signal to turn off when the Pin voltage exceeds 2.37V, LED channels are all connected, Pin25 will start charging, charging to 3V LED balanced circuit will be closed to the Pin began to discharge when discharge to 0.1V, the balance circuit back to work. When The Pin voltage drops to 2.27V at any time, the boost driving signal to re-start the return to normal work.

If at least one LED channel open, close the drive signal when the Pin voltage rose to 2.37V, Pin25 will not operate when the output voltage drops The PIN down to 2.27V, the drive signal recovery and ignored open LED channel continue to work properly. When the output voltage is shorted to ground or Schottky diode open circuit, the output voltage drops to the Pin voltage dropped to 0.1V, the chip will shut down the drive signal, When The Pin voltage is restored to 0.1V, the chip back to work.

Pin27: LED short-circuit range setting, set the Pin voltage through the resistor network any way LED current sensing to compensate for Pin (COMP1-6) voltage is four times higher than that of the Pin voltage, the LED The channel will be shut down, the other channels work properly.
, parameter calculation and to confirm

Since the output of 25 LEDs in series, 6-channel, so the output voltage of about 25 x 3.3V = 82.5V, in fact, accurate output voltage from 120mA The current through the voltage drop across the LED lights produce decisions. Enter the VIN = 24V, 24V rose to about 82.5V, you need to step-up circuit (the BOOST) the step-up circuit by an inductor, a Mosfet, a Schottky diode,led spotlight, and output of electrolytic capacitors. The OZ9967 adjust the the the Pin13 drive signal duty cycle D, after the negative feedback LED current across the sense resistor, inductor release energy in the the Mosfet opening of the stored energy shutdown in order to obtain the required maximum output voltage.

critical inductance L = 17uH.
L> the 17uH when, the work of the boost circuit in continuous mode; L
calculate the peak inductor current:
available inductor peak current Ip = 5A. so we can use inductance of 22uH/6A.

17-08-2016 22:01

rammer писал:

или английский ...

Ну вот, только открыл китайский разговорник, и такой облом......
rammer, спасибо, респект и уважуха!