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Address: 3418, Duhuixuan, Shennan Avenue, Futian District, Shenzhen, Guangdong Province, China
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Shenzhen Hongxinwei Technology Co., Ltd |
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Monolithic Power Systems MPS MP4026GJ Z LED Lighting Driver Offline PSR LED Controller
DESCRIPTION
The MP4026 is a primary-side-control, offline
LED controller that achieves high-power factor
and accurate LED current for isolated, singlepower-stage
lighting applications in a tiny
TSOT23-6 package. It is the next generation of
the successful MP4021A. The proprietary realcurrent-control
method accurately controls LED
current from primary-side information with good
line and load regulation. The primary-side-control
eliminates the secondary-side feedback
components and the opto-coupler to significantly
simplify LED-lighting-system design.
The MP4026 integrates power-factor correction
and works in valley switching mode to reduce
MOSFET switching losses.
The MP4026’s multiple protection features
greatly enhance system reliability and safety.
These features include over-voltage protection,
short-circuit protection, primary-side over-current
protection, brown out protection, cycle-by-cycle
current limiting, VCC under-voltage lockout, and
auto-restart over-temperature protection.
FEATURES
• Real-Current Control without SecondaryFeedback
Circuit
• Good Line/Load Regulation
• High Power Factor (≥0.9) over Universal
Input Voltage
• Valley Switching Mode for Improved
Efficiency
• Brown-Out Protection
• Over-Voltage Protection
• Short-Circuit Protection
• Over-Temperature Protection
• Primary-Side Over-Current Protection
• Cycle-by-Cycle Current Limit
• Input UVLO
• Available in TSOT23-6
APPLICATIONS
• Industrial and Commercial Lighting
• Residential Lighting
All MPS parts are lead-free, halogen free, and adhere to the RoHS
directive. For
MPS green status, please visit MPS website under Quality Assurance.
“MPS”
and “The Future of Analog IC Technology” are Registered Trademarks
of
Monolithic Power Systems, Inc
ABSOLUTE MAXIMUM RATINGS (1)
Input Voltage VCC ..........................-0.3V to +30V
Gate Drive Voltage .......................-0.3V to +17V
ZCD Pin .........................................-0.3V to 6.5V
Other Analog Inputs and Outputs ..-0.3V to 6.5V
Max. Gate Source Current......................... 0.8A
Max. Gate Sink Current ................................ -1A
Continuous Power Dissipation (TA = +25°C)(2)
TSOT23-6 ................................................ 1.25W
Junction Temperature...............................150°C
Lead Temperature ....................................260°C
Storage Temperature............... -65°C to +150°C
Recommended Operating Conditions (3)
Supply Voltage VCC ...........................12V to 28V
Operating Junction Temp. (TJ)..-40°C to +125°C
PIN FUNCTIONS Pin Name Description 1 VCC Power Supply. Supplies power for the control signals and the high-current MOSFET. Bypass to ground with an external bulk capacitor (typically 4.7µF). 2 MULT Input Voltage Sense. Connect to the tap of resistor divider between the rectified AC line and GND. The half-wave sinusoid provides a reference signal for the internalcurrent-control loop. The MULT pin is also used for brown-out protection detection. 3 COMP Loop Compensation. Connect a compensation network to stabilize the LED driver and maintain an accurate LED current. 4 GND Ground. Current return for the control signal and the gate-drive signal. 5 CS/ZCD Current Sense or Zero-Current Detection. When the gate driver turns on, a sensing resistor senses the MOSFET current. The comparison between the sensed voltage and the internal sinusoidal-current reference determines when the MOSFET turns off. If the pin voltage exceeds the current limit (2.0V, after turn-on blanking) the gate drive turns off. When the gate driver turns off, the negative falling-edge (after the blanking time) triggers the external MOSFET’s turn-on signal. Connect this pin to a resistor divider though a diode between the auxiliary winding and GND. Over-voltage condition is detected through ZCD. For every turn-off interval, if the ZCD voltage exceeds the over-voltage-protection threshold after the 1.6µs (Vmult_o >0.3V) or 0.8µs (Vmult_o ≤0.3V) blanking time, over-voltage protection triggers and the system stops switching until auto-restart. CS/ZCD is also used for primary-side over-current-protection, if the sensing voltage reaches to 2.5V after a blanking time at gate turn-on interval, the primary-side overcurrent-protection triggers and the system stops switching until auto-restart. A 10pF ceramic cap is recommended to connect from CS/ZCD to GND to bypass the high frequency noise. In order to reduce the RC delay influence to the sample accuracy of the current sensing signal, the CS/ZCD down side resistance (RZCD2 in figure 7) is suggested to be selected as small as 1kΩ. 6 GATE Gate Drive Output. This totem-pole output stage can drive a high-power MOSFET with a peak current of 0.8A source and 1A sink. The high-voltage limit is clamped to 14.5V to avoid excessive gate-drive voltage. The low-voltage is higher than 6.7V to guarantee a sufficient drive capacity
OPERATION The MP4026 is a primary-side-controlled, offline LED controller for high-performance LED lighting. It has primary-side real-current control for accurate LED current regulation. It also has active power factor correction (PFC) to eliminate harmonic noise on the AC line. The rich protections can achieve a high safety and reliability in real application. Start Up Initially, AC line charges up VCC through the start-up resistor. When VCC reaches 24.9V, the control logic starts. Then the power supply is taken over by the auxiliary winding when the voltage of auxiliary winding builds up. The MP4026 will shut down when VCC drops below 9.3V. The high hysteretic voltage allows for a small VCC capacitor (typically 4.7μF) to shorten the start-up time. Valley Switching Mode During the external MOSFET ON-time (tON), the rectified-input voltage (VBUS) charges the primary-side inductor (LP) causing the primaryside current (IPRI) to increase linearly from zero to peak value (IPK). When the MOSFET turns off, the energy stored in the inductor is transferred to the secondary-side, which activates the secondary-side diode to power the load. The secondary current (ISEC) decreases linearly from its peak value to zero. When the secondary current decreases to zero, the MOSFET drainsource voltage starts oscillating, which is caused by the primary-side magnetizing inductance and parasitic capacitances—the voltage ring also is reflected on the auxiliary winding (see Figure 2). To improve primarycontrol precision, the chip monitors when ZCD voltage falls to zero twice before the next switching period. The zero-current detector from CS/ZCD generates GATE turn-on signal when the ZCD voltage falls below 0.295V the second time (see Figure 3). This virtually eliminates switch turn-on loss and diode reverse-recovery losses, ensuring high efficiency and low EMI noise
Q1. What is your terms of packing?
A: Generally, we pack our goods in neutral white boxes and brown cartons.
If you have legally registered patent, we can pack the goods in your branded boxes after getting your authorization letters.
Q2. What is your MOQ?
A: We provide you small MOQ for each item, it depends your specific order!
Q3. Do you test or check all your goods before delivery?
A: Yes, we have 100% test and check all goods before delivery.
Q4: How do you make our business long-term and good relationship?
We keep good quality and competitive price to ensure our customers benefit ;
We respect every customer as our friend and we sincerely do business and make friends with them,It's not something that can be replaced.
Q5: How to contact us?
A: Send your inquiry details in the below,Click "Send"Now!!!
Shenzhen Hongxinwei Technology Co., Ltd
To adopt new technology,to produce products of quality,to offer high-class service.
Improve the management system continuously to meet customer requirement for high-quality products and services.
Why choose us?
