The M5579 series are highly integrated current-mode PWM controller ICs designed for high-performance, low standby power and low-cost offline flyback power adapters.
Operating at a fixed frequency of 65kHz under full-load conditions, the IC switches to valley-switching green mode when the load drops to maintain high conversion efficiency at high power levels. Under extremely light-load conditions, it enters extended burst mode to effectively reduce standby power consumption and achieve high conversion efficiency across the entire load range.
The M5579 series features ultra-low VCC startup current and operating current to meet various low-power power supply 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). The IC offers excellent EMI immunity. Its operating frequency is kept above the 25kHz audio band to eliminate audible noise during operation.
Offline AC-DC Flyback Converters
General Power Supplies
Power Adapters
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Extended burst operating mode for improved conversion efficiency and ultra-low standby power consumption
Audible noise suppression function
VCC lockout with hysteresis (UVLO)
VCC Overvoltage Protection (VCC OVP)
Fixed output power limit current threshold setting over universal input voltage range
Overload Protection (OLP) with internal auto-recovery
Thermal Protection (OTP) with auto-recovery
Output Overvoltage Protection (Output OVP) with auto-recovery
Compliant with latest Level VI energy efficiency standard
| Category | Parameters |
| Operating Mode |
Multi-stage composite operation: fixed 65 kHz PWM, valley switching at full load, 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) | Trigger threshold: 6.8 / 7.3 / 7.8 V; Release threshold: 16 / 17 / 18 V |
| Overvoltage Protection |
26.5 / 28 / 29.5 V; Adjustable Output OVP Current Threshold: 170 / 180 / 190 µA |
| Feedback (FB) |
Open-loop Voltage: 5.1 V |
| 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 Time: 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 with auto-recovery; Over-temperature point adjustable via external thermistor on RT pin
|
| 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 | Compliant with latest Level VI energy efficiency standard; low standby power consumption, audible noise suppression |
| Package Type |
DIP-8 |
Pending update...
