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Overview
| Topology | Flyback Converter |
| Input voltage | 90-265 V |
| Switching frequency | 60-70 kHz |
| IC revision | 2-2 |
Description
The AP3125X is a current mode PWM controller which is optimized for high performance, low standby power and cost effective offline fly-back converters. It is available in SOT26 package.The PWM switching frequency at normal operation is internally fixed (about 65kHz/100kHz). In middle load, IC will enter green mode to improve system efficiency with the help of frequency fold-back. A minimum switching frequency (about 20kHz) is set to avoid the audible noise. In no load or light load, the IC will enter the burst mode to minimize standby power. Furthermore, the frequency dithering function is built-in to reduce EMI emission.Internal slope compensation allows more stable Peak-Current Mode control over wide range of input voltage and load conditions. Internal line compensation ensures constant output power limit over entire universal line voltage range.Comprehensive protection features are included, such as cycle-by-cycle current limit (OCP), VCC Over Voltage Protection (VOVP), internal OTP, Over Load Protection (OLP) and pins’ fault protection.The versatile latch/auto functions can be implemented using a minimal number of external components by CTRL pin.
Features
- Very Low Start-up Current
- Current Mode Control
- Non-audible-noise Green-mode Control
- Internal Slope Compensation
- Soft Start During Startup Process
- Frequency Fold Back for High Average Efficiency
- Secondary Winding Short Protection with FOCP
- Soft Switching for Reducing EMI
- VCC Maintain Mode
- Useful Pin Fault Protection:SENSE Pin FloatingCTRL Pin Short to GroundFB/Opto-coupler Open/Short
- Comprehensive System Protection Feature:VCC Over Voltage Protection (VOVP)Over Load Protection (OLP)
- Optional Latch Mode for VOVP, OLP and CTRL Pin Protection
- Mini Size Package of SOT26
- Pin to Pin Compatible with AP3105NA/NV/NL/NR
- Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2)
- Halogen and Antimony Free. “Green” Device (Note 3)
Typical applications
- Set-top Box (STB) Power Supply
- Switching AC-DC Adapter/Charger
- Open Frame Switching Power Supply
- ATX/BTX Auxiliary Power
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | Size | Operating Temperature | DF(%) | RISO | Ceramic Type | Fl(mm) | Packaging | Endurance(h) | IRIPPLE(mA) | ILeak(µA) | Pitch(mm) | Ø D(mm) | IR(A) | L(mH) | RDC max.(mΩ) | VR(V (DC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WCAP-CSGP MLCCs 50 V(DC), 150 pF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance150 pF | Capacitance±10% | Size0805 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor2.5 % | Insulation Resistance10 GΩ | Ceramic TypeX7R Class II | Pad Dimension0.5 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | Rated Voltage50 V (DC) | – | – | Length2 mm | Width1.25 mm | Height0.8 mm | – | |||||
| WCAP-CSGP MLCCs 50 V(DC), 2.2 nF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance2.2 nF | Capacitance±10% | Size0805 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor2.5 % | Insulation Resistance10 GΩ | Ceramic TypeX7R Class II | Pad Dimension0.5 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | Rated Voltage50 V (DC) | – | – | Length2 mm | Width1.25 mm | Height0.8 mm | – | |||||
| WCAP-CSGP MLCCs 50 V(DC), 100 nF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance100 nF | Capacitance±10% | Size0805 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor2.5 % | Insulation Resistance5 GΩ | Ceramic TypeX7R Class II | Pad Dimension0.5 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | Rated Voltage50 V (DC) | – | – | Length2 mm | Width1.25 mm | Height0.8 mm | – | |||||
 | WCAP-ATLL Aluminum Electrolytic Capacitors, 10 µF, ±20% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATLL Aluminum Electrolytic Capacitors | Capacitance10 µF | Capacitance±20% | – | – | Dissipation Factor10 % | – | – | – | PackagingAmmopack | Endurance 4000 | Ripple Current120 mA | Leakage Current5 µA | Pitch2 mm | Diameter5 mm | – | – | – | Rated Voltage50 V (DC) | – | – | Length11 mm | – | – | – | ||||
 | WCAP-ATG5 Aluminum Electrolytic Capacitors, 68 µF, ±20% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATG5 Aluminum Electrolytic Capacitors | Capacitance68 µF | Capacitance±20% | – | – | Dissipation Factor15 % | – | – | – | PackagingAmmopack | Endurance 2000 | Ripple Current410 mA | Leakage Current816 µA | Pitch7.5 mm | Diameter16 mm | – | – | – | Rated Voltage400 V (DC) | – | – | Length25 mm | – | – | – | ||||
| WCAP-ATLL Aluminum Electrolytic Capacitors, 220 µF, ±20% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATLL Aluminum Electrolytic Capacitors | Capacitance220 µF | Capacitance±20% | – | – | Dissipation Factor16 % | – | – | – | PackagingAmmopack | Endurance 7000 | Ripple Current540 mA | Leakage Current35.2 µA | Pitch3.5 mm | Diameter8 mm | – | – | – | Rated Voltage16 V (DC) | – | – | Length11.5 mm | – | – | – | ||||
 | WCAP-ATG8 Aluminum Electrolytic Capacitors, 680 µF, ±20% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATG8 Aluminum Electrolytic Capacitors | Capacitance680 µF | Capacitance±20% | – | – | Dissipation Factor16 % | – | – | – | PackagingAmmopack | Endurance 2000 | Ripple Current640 mA | Leakage Current108.8 µA | Pitch3.5 mm | Diameter8 mm | – | – | – | Rated Voltage16 V (DC) | – | – | Length16 mm | – | – | – | ||||
 | WE-CMBNC Common Mode Power Line Choke Nanocrystalline, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CMBNC Common Mode Power Line Choke Nanocrystalline | – | – | SizeXS | Operating Temperature -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | Rated Current0.9 A | Inductance11 mH | DC Resistance430 mΩ | Rated Voltage300 V (DC) | Insulation Test Voltage2100 V (AC) | MaterialNanocrystalline | Length14 mm | Width7.5 mm | Height16 mm | MountTHT |