ZA8606 Description
The ZA8606 is a non-isolation LED buck controller and integrated in SOT-23-6 package. It provides a simple circuit to get higher power
factor, higher efficiency and accuracy constant current; hence ZA8606 can meet LED lighting requirements and reduce the cost of LED power supply. The ZA8606 has a 45kHz fixed frequency oscillator, an internal 200mV precision reference, and a PWM comparator with latching logic. The accurate output LED current is achieved by an averaging current feedback loop and the LED current dimming can be easily controlled via the Dim pin.
The ZA8606 also has multiple features to protect the controller and system from fault conditions, including : Under Voltage Lockout (UVLO), Over Current Protection (OCP) and Over Voltage Protection (OVP). Additionally, to ensure the system reliability, the ZA8606 is built with the thermal protection function(OTP).
ZA8606 Features
? ■Non-Isolation LED driver
? ■SOT-23-6 package
? ■Lower BOM Cost
? ■High Power Factor by One Cycle Control
? ■Lower THD Performance
? ■Accuracy Constant Current
? ■Linear Dimming on DIM Pin
? ■45kHz of fixed Frequency Control
? ■Gate Output Voltage Clamp
? ■LED Open Protection (OVP) with auto recovery
? ■LED Short Protection (SCP) with auto recovery
? ■Over Current Protection (OCP) with auto recovery
? ■Internal OTP Protection with auto recovery
? ■300mA Driving Capability for GATE Pin
ZA8606 Application:E26/27, T8 LED Tube, Others LED Lighting Applications
Marking Information
Pin Configuration (Top View):
ZA8606 Pin Description:
Pin No.
| Name | Function |
| 1 | VCC | When starting power, through the external starting resistance provides the starting current of Vcc capacitor charging, Vcc to UVLO on 18 v, IC and set to work, when the voltage is provided by Vcc capacitor temporarily, after the establishment of the LED string voltage until the output, and then through the Zener diode and super fast diode string voltage output leds to provide for the use of IC. If the VCC voltage is lower than the UVLO off under voltage when they stop working point 8 v current output circuit to reduce shut down. Another ZA8606 in VCC pins internal overvoltage detection protection function, when VCC voltage higher than 28 v over-voltage protection, immediately shut gate output driver circuit, stop system action to achieve protection, the protection mode is the Auto - recovery mode, so once lifted over voltage condition, restore automatically. |
| 2 | GND | Ground Pin |
| 3 | GATE | (drive Pin) ZA8606 is 45 KHZ frequency operation and maximum working cycle is about 90%, and the smallest working cycle time of 410 ns, can make the design of the transmission pressure has great range, in order to reduce EMI interference, IC internal vibrating frequency and soft drive function, the other GATE pin inside a 13.5 V clamping circuit, avoid too much damaged MOSFET GATE voltage signal. |
| 4 | DIM | (dimming or external protection Pin) Using three different working voltage range to reach three different kinds of work patterns, details are as follows: 1, when the DIM pin voltage is less than 0.25 V, MOSFET will be turned off, and into protection mode, can be used for OTP, OVP and other protective functions 2, when the DIM pin between 0.3 V to 3 V, will enter the linear dimming range, the linear adjustable LED current to adjust the brightness of the leds 3, when the DIM pin when the voltage is greater than 3 v, operating in a general state (set by the CS pin LED current). 4, if use empty pin, IC internal will set high standards for IC can be normal operation |
| 5 | COMP | (loop compensation) In the PFC control circuit, design of circuit compensation network tends to affect the stability level and system of PFC. In order to have a better PF value, general loop compensation network bandwidth will be in 10Hz above. While the loop compensation network is the easiest of thecapacitor can be used a 1uF~4.7uF to complete the compensation. |
| 6 | I-SEN | (constant current detection of Pin) ZA8606 constant current control mode is controlled by the CS pin to the Resense pressure dropreaches a constant current, constant current can be obtained from the following formula:Iled=0.2V/Rsense |
ZA8606 Application Circuit:
ZA8606 Function Block
ZA8606 bulb lamp test data（AC input 90~264Vac,Output 48V 250mA）
The advantage of ZA8606 summary
◆Support universal input voltage (90~264V) and linear adjustment rate! The output can becompatible with a power of 12 series ~24 on board, and the output current changes within 3%!
◆ can achieve OTP, OVP and other protection function, DIM feet can realize linear dimming,brightness can be adjusted by adjusting the current linear LED LED.
◆ high precision steady current, constant current accuracy of ± 1% (90~264 input changes)
◆ good batch consistency! After mass production batch verification, current accuracy can becontrolled within +/-3%! Because of the inductance current, output LED current is controlled byexternal components have little effect!
◆ high efficiency. The output of 18W, the highest efficiency up to 94%!
◆ open circuit, the output voltage can be clamped.
◆ The chip can drive 10A MOSFET (maximum power of 40W can be achieved)
◆ The circuit is very compact, BOM COST can be controlled within 5RMB (without EMC parts)
◆ The circuit can adopt general I-shaped inductance design, without the use of E type inductor,so the design of BOM lower cost.
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