OZ9956 схема включения, описание

Микросхемы OZ9956B и OZ9956C, Производитель- O2micro®

OZ9956B

FEATURES OZ9956B
• High frequency DC/DC power converter controller
• Drives up to 6 strings in parallel
• Integrated LED current balance control circuit
• Wide input voltage range
• Up to 2.0MHz switching frequency
• External PWM dimming
• Over-voltage and over-current protection
• Soft start function

GENERAL DESCRIPTION OZ9956B
The OZ9956B is a high effi ciency, DC/DC controller that drives up to six (6) strings of
LEDs in parallel confi guration, with multiple LEDs in each string connected in series.
It is targeted for notebook/netbook applications.
It provides six (6) LED current sense inputs in an “OR” confi guration for improved
backlight reliability. This allows the backlight to remain functioning in the event that
any string (s) is damaged during normal operation.
OZ9956B can receive either an analog signal or an external Pulse Width Modulation
(PWM) signal for the dimming control function.
This IC provides an integrated circuit to balance the current fl ow through each LED
string, as well as, the integrated power MOSFET.

OZ9956C

FEATURES OZ9956C
• High frequency DC/DC power converter controller
• Drives up to 6 strings in parallel
• Integrated LED current balance control circuit
• Integrated power MOSFET
• Up to 1.5MHz switching operation
• Supports phase-shift dimming with adaptive phase control
• External PWM dimming control
• Output over-voltage and short circuit protection
• LED over-current and short circuit protection
• Switch over-current protection
• Thermal protection
• Under-voltage protection

GENERAL DESCRIPTION OZ9956C
The OZ9956C is a high effi ciency, DC/DC controller that drives up to six (6) strings o
LEDs in parallel confi guration, with multiple LEDs in each string connected in series.
t is targeted for notebook/netbook applications.
t provides six (6) LED current sense inputs in an “OR” confi guration for improved
backlight reliability. This allows the backlight to remain functioning in the event that
any string (s) is damaged during normal operation.
OZ9956C supports an external Pulse Width Modulation (PWM) signal for the phase-
shifted dimming control function. It provides an integrated circuit to balance the cur-
ent fl ow through each LED string, as well as, the integrated power MOSFET.

Схема включения OZ9956B

Схема включения OZ9956C

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