The M5579BDR is a highly integrated current-mode PWM controller IC suitable for high-performance, low standby power and low-cost offline flyback power adapter solutions.
It operates at a fixed frequency of 65kHz under full-load conditions. When the load decreases, the device switches to valley-switching green mode to maintain high power conversion efficiency at high power levels. Under light-load conditions, it enters extended burst mode to significantly reduce standby power consumption and achieve high conversion efficiency across the entire load range.
The IC features ultra-low VCC startup current and operating current to satisfy low-power design requirements. It integrates a complete set of auto-recovery protection functions including cycle-by-cycle overcurrent protection (OCP), overload protection (OLP), under-voltage lockout (UVLO), over-temperature protection (OTP) and overvoltage protection (OVP), delivering excellent EMI immunity. Its operating frequency avoids the audio band below 25kHz to eliminate audible noise during operation.
Offline AC-DC Flyback Converters
General Power Supplies
Power Adapters
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Full load: Fixed 65 kHz frequency with valley switching mode
Medium & light load: Extended burst operating mode
Light load & no load: Burst mode for power consumption reduction
Frequency dithering technology to optimize EMI performance
Extended burst mode improves conversion efficiency and achieves ultra-low standby power consumption
Built-in audio noise processing to suppress audible noise
Integrated frequency dithering technology to improve EMI characteristics and reduce filter cost
Compliant with latest Level VI energy efficiency standard, excellent power consumption under light load and no-load conditions
| Category | Parameters |
| Operating Mode | Multi-stage composite operation: fixed 65 kHz PWM at full load with valley switching; extended burst mode for medium and low loads |
| Response / Oscillation Frequency | Normal Operating Frequency: 60 / 65 / 70 kHz (Typical: 65 kHz); Burst Mode Frequency: 25 kHz; Frequency Dithering: ±6% |
| Supply Current |
VCC Start-up Current: 2 / 5 µA; Operating Current: 2.5 / 3 mA; Burst Mode Current: 0.6 / 0.7 mA |
| Undervoltage Lockout (UVLO) | Entry threshold: 6.8 / 7.3 / 7.8 V; Release threshold: 16 / 17 / 18 V |
| Overvoltage Protection |
26.5 / 29.5 V; Output OVP adjustable current threshold: 170 / 180 / 190 µA |
| Feedback (FB) |
Open-loop Voltage: 5.1 V PWM Input Gain: 3.5 V/V Maximum Duty Cycle: 77 / 80 / 83 % Green Mode Threshold: 2.1 V Burst entry: 1.23 V / Burst exit: 1.33 V; OLP Threshold: 4.4 V / 60 ms |
| Current Sensing (SEN) |
Cycle-by-cycle overcurrent threshold: 0.43 / 0.45 / 0.47 V; OCP clamp: 0.72 V; Leading edge blanking: 300 ns; Detection delay: 90 ns; Soft-start: 2 ms |
| Gate Drive (GATE) | Low-side output: 1 V; High-side output: 6 V; Clamp Voltage: 11 V; Rise Time: 100 ns; Fall Time: 30 ns |
| Protection Functions |
Cycle-by-cycle Current Limit (OCP), Overload Protection (OLP), Under Voltage Lockout (UVLO), Thermal Shutdown (OTP), VCC / Output Overvoltage Protection (OVP), all auto-recovery; Over-temperature threshold adjustable via thermistor connected to RT pin
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| Overtemperature Protection |
OTP trigger temperature: 150 ℃; recovery temperature: 120 ℃ (internal); OTP sensing current: 94 / 100 / 106 µA |
| Temperature Parameters | Operating Junction Temperature: -40 ~ 150 ℃; Ambient Temperature: -40 ~ 85 ℃; Storage Temperature: -55 ~ 150 ℃; Soldering Condition: 260 ℃ / 10 s |
| Energy Efficiency Standards | Complies with latest Level VI energy efficiency standard; low standby power consumption, audible noise suppression |
| Package Type | SOP8 |
Pending update...
