PKS604YN - 23W/44W Peak Offline Flyback Switch IC | Power Integrations
N.º da peça: PKS604YN ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $1.95 | $1,95 |
| 10 | $1.76 | $17,60 |
| 100 | $1.42 | $142,00 |
| 500 | $1.18 | $590,00 |
| 1.000 | $0.99 | $990,00 |
PKS604YN Visão geral
An offline flyback switcher IC is a type of AC-DC power supply controller that directly rectifies the AC mains and switches a high-voltage primary MOSFET to transfer energy through a transformer to an isolated secondary output. Compared to general-purpose PWM controllers, offline switchers integrate the power MOSFET, current-limit, and over-temperature protection blocks, simplifying EMI design and shrinking the bill of materials. They sit at the bottom of the power management hierarchy: AC-DC converter -> offline flyback switcher -> power management IC -> semiconductor device. The 700 V MOSFET rating provides substantial margin against line transients on universal-input mains (85-265 VAC). The 277 kHz switching frequency allows use of a small, low-profile transformer and small input/output filter capacitors. The IC embeds auto-restart protection for short-circuit, over-current, and over-temperature faults, allowing the converter to recover without external intervention. The TO-220-7C package with formed leads offers through-hole mounting with high creepage clearance for reinforced isolation, which is important for universal-input designs. A typical application circuit uses a bridge rectifier, bulk capacitor, transformer, secondary diode, and TL431/optocoupler feedback network. The high level of integration reduces PCB area by up to 50 percent versus discrete implementations, making the PKS604YN well-suited for compact sealed adapters and auxiliary supplies. Compared to discrete UC3842 + MOSFET designs, the integrated switcher shrinks the BOM, lowers standby power, and provides built-in fault handling. The device's frequency-modulation and PWM control produce low EMI, simplifying compliance with EN55022 and FCC Class B limits.
Typical applications include appliance power supplies, white-goods controllers, industrial auxiliary supplies, standby rails for white goods, IoT gateways, and LED driver auxiliaries. When using this part, observe the recommended minimum bulk-capacitor voltage rating for 265 VAC operation, provide adequate heatsinking through the TO-220 tab, and place the Y-capacitor and transformer shield per Power Integrations' reference design to meet EMI limits.
Alternativas drop-in para PKS604YN — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
LNK623PG
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
LNK624PG
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
LNK625PG
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
LNK626PG
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
TOP244YN
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PKS604YN Classificações máximas e características elétricas
| Product Type | AC-DC Converter / Offline Flyback Switcher |
| Manufacturer | Power Integrations |
| Topologia | Flyback |
| Output Power (Open Frame, Continuous) | 23 W |
| Output Power (Open Frame, Peak) | 44 W |
| Output Power (Adapter, Continuous) | 35 W |
| Output Power (Adapter, Peak) | 56 W |
| Frequência de comutação | 277 kHz |
| Encapsulamento | TO-220-7C (6-lead, formed leads) |
| Tipo de montagem | Through-Hole |
| Input Voltage Range (AC Mains) | 85 VAC to 265 VAC (universal) |
| Control Method | PWM with frequency modulation |
| Built-in Protections | Over-temperature (OTP), over-current (OCP), auto-restart on fault |
| Isolation | Reinforced isolation (transformer-based) |
| Lead-Free / RoHS Status | Lead-Free / RoHS compliant (per distributor listings) |
Configuração de pinos do PKS604YN
| Pino 1 | DRAIN — High-voltage MOSFET drain (connected to transformer primary) |
| Pino 2 | SOURCE / GND — Power ground return for primary-side current |
| Pino 3 | FB — Feedback input from optocoupler / secondary-side error amplifier |
| Pino 4 | BP |
| Pino 5 | NC — Not connected (per datasheet) |
| Pino 6 | NC — Not connected (per datasheet) |
| Pino TAB | DRAIN (tab) — High-voltage MOSFET drain - electrically tied to Pin 1; provides thermal pad for heatsinking |
Aplicações típicas
PKS604YN é adequado para 6 aplicaçãos: White Goods / Appliance Auxiliary Power Supply, Industrial Auxiliary / Standby Rail, Enclosed AC-DC Adapter (35 W), LED Driver Auxiliary Supply, IoT Gateway / Smart Home Hub PSU, Set-Top Box / Networking Equipment Standby Rail.
White Goods / Appliance Auxiliary Power Supply
The PKS604YN's 23 W continuous / 44 W peak open-frame output and universal 85-265 VAC input make it ideal for white-goods auxiliary supplies such as refrigerator controllers, dishwasher control boards, washing-machine UI panels, and HVAC control boards. The integrated 700 V MOSFET provides line-transient margin on rectified 265 VAC mains, while the 277 kHz switching frequency shrinks the transformer and filter capacitors versus legacy 65 kHz designs. In a typical refrigerator control board, the PKS604YN steps 220 VAC down to a 12 V/5 V isolated rail that powers the microcontroller, display, and relay drivers. Auto-restart protection on over-current and over-temperature faults improves reliability in harsh appliance environments where fan failure or blocked ventilation would otherwise destroy the supply.
Recomendado
Industrial Auxiliary / Standby Rail
Industrial equipment needs isolated auxiliary rails for control logic, sensors, and communication interfaces. The PKS604YN's 23 W continuous rating comfortably powers a 24 V/0.5 A logic supply and a 5 V/0.5 A sensor supply from 24 VAC or 110/220 VAC industrial mains. The TO-220-7C through-hole package with formed leads provides high creepage clearance, which is critical for industrial reinforced-isolation requirements (IEC 61558). Built-in over-temperature protection with auto-restart lets the converter survive fan-failure events common in factory environments. For PLC auxiliary supplies, the PKS604YN replaces discrete UC3842 + MOSFET designs with approximately 50 percent PCB-area reduction.
Recomendado
Enclosed AC-DC Adapter (35 W)
The PKS604YN delivers 35 W continuous / 56 W peak in an enclosed adapter (per Power Integrations' thermal data), which is the typical power level for laptop replacement adapters, networking-equipment wall warts, and small desktop-power bricks. The 277 kHz switching frequency enables a compact planar or EE16 transformer and reduces the size of input Pi-filter and output LC-filter components. Universal 85-265 VAC input is required for global-market adapters without manual voltage switching. Auto-restart protection on output short-circuit and overload events satisfies IEC 60950-1 / IEC 62368-1 fault-tolerance requirements without external protection circuitry.
Recomendado
LED Driver Auxiliary Supply
Commercial LED luminaires and emergency-driver units require a small isolated auxiliary supply to power the microcontroller, BLE module, and dimming interface. The PKS604YN's 23-35 W range is well-matched to 50-100 W LED-driver auxiliary needs (typically 5 V/0.5 A). Its high switching frequency of 277 kHz enables a small-form-factor transformer that fits inside the LED-driver housing. The integrated protection features reduce field returns in commercial lighting installations where reliability is paramount. The TO-220-7C package is easily heatsunk on the driver PCB aluminum substrate.
Recomendado
IoT Gateway / Smart Home Hub PSU
Smart-home hubs and IoT gateways need a compact, isolated 5 V/2 A supply from universal AC mains. The PKS604YN's 35 W adapter rating covers this load with margin, while its integrated protection satisfies IEC 62368-1 fault requirements. The small 277 kHz transformer footprint fits inside the gateway enclosure without increasing height. Auto-restart on fault lets the gateway gracefully recover from a temporary short on a downstream USB port. The TO-220-7C package's high creepage clearance supports reinforced isolation for 4 kV hipot testing.
Recomendado
Set-Top Box / Networking Equipment Standby Rail
Set-top boxes, cable modems, and Wi-Fi routers require a low-power standby rail to maintain Ethernet, RTC, and remote-control wakeup functions while the main supply is off. The PKS604YN can power a small always-on standby converter (typically 5 V/0.2 A) with high efficiency at light loads. The integrated protection features ensure the standby rail survives shorts on the main rail during power-on sequencing. The TO-220-7C package's small footprint is ideal for the densely-populated mainboards of consumer networking equipment.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PKS604YN — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LNK623PG | LNK624PG | LNK625PG | LNK626PG | TOP244YN |
|---|---|---|---|---|---|---|
| Package | TO-220-7C (6-lead) | TO-220-7C (6-lead) - same | TO-220-7C (6-lead) - same | TO-220-7C (6-lead) - same | TO-220-7C (6-lead) - same | TO-220-7C (6-lead) - same |
| Brand | Power Integrations | Power Integrations | Power Integrations | Power Integrations | Power Integrations | Power Integrations |
| Topology | Flyback | Flyback | Flyback | Flyback | Flyback | Flyback |
| Switching Frequency | 277 kHz | 277 kHz - same | 277 kHz - same | 277 kHz - same | 277 kHz - same | 132 kHz - different |
| AC Input Range | 85-265 VAC | 85-265 VAC - same | 85-265 VAC - same | 85-265 VAC - same | 85-265 VAC - same | 85-265 VAC - same |
| Built-in Protections | OTP, OCP, auto-restart | OTP, OCP, auto-restart - same | OTP, OCP, auto-restart - same | OTP, OCP, auto-restart - same | OTP, OCP, auto-restart - same | OTP, OCP, OVP, auto-restart |
Principais diferenciais
- Higher switching frequency (277 kHz) enables smaller magnetics (vs TOP244YN (132 kHz))
- Higher peak output power rating for adapter use (vs LNK623PG)
- Auto-restart on over-current and over-temperature faults (vs Discrete UC3842 + 800 V MOSFET design)
Notas de projeto
The TO-220-7C package dissipates heat through the tab; for continuous 35 W operation in an enclosed adapter, the tab must be heatsinked with at least 50 cm^2 of copper or a small clip-on heatsink. Estimated: with theta_JA = 40 C/W (1 oz copper, no extra heatsink) and 2 W internal dissipation (5.7 percent efficiency loss), junction temperature rises 80 C above ambient, requiring derating above 50 C ambient. Add an external clip-on heatsink of theta_SA = 15 C/W to lower junction rise to ~50 C at 25 C ambient.
Place the input bulk capacitor (typically 4.7-10 uF / 400 V) as close as possible to the high-voltage drain and the rectifier bridge. Keep the primary-side loop area (DRAIN - transformer primary - SOURCE) minimal to reduce radiated EMI. Use a Y1-class Y-capacitor (typically 2.2-4.7 nF) between primary and secondary ground returns to provide a high-frequency common-mode return path. Reference Power Integrations' DER-32 reference design for layout guidelines. The transformer must include an electrostatic shield between primary and secondary windings for reinforced isolation.
Do not exceed the absolute maximum drain voltage of 700 V; on 265 VAC rectified mains, the DC bulk voltage reaches ~375 V, but line transients can push this above 600 V. Always use a MOV (275 VAC rated) across the AC input for surge protection per IEC 61000-4-5. Ensure the feedback optocoupler and TL431 secondary-side error amplifier have proper compensation - typical compensation values are 10 nF across the TL431 cathode-anode and 1 kohm in series with the optocoupler LED. Do not omit the bias supply bypass capacitor on the BP pin (typically 1 uF / 10 V); without it the device will not start up.
Maintain at least 6.5 mm creepage and 5 mm clearance between primary-side and secondary-side copper to meet IEC 62368-1 reinforced isolation. The TO-220-7C formed leads give approximately 8 mm of creepage, exceeding this requirement. Keep the high-voltage drain trace on the top layer and minimize its length to reduce radiated emissions. Place the secondary-side rectifier and output capacitor directly across the secondary winding to minimize high-frequency ringing.
The feedback signal from the optocoupler should be routed away from the high-voltage drain trace and transformer to avoid capacitive coupling of switching noise into the control loop. A small RC filter (1 kohm + 1 nF) at the FB pin can improve noise immunity if the supply is operating near the OCP threshold. Verify feedback loop stability by checking the cross-over frequency (target 1-5 kHz) and phase margin (target >45 degrees) using a network analyzer on the assembled converter.
Informações de conformidade
RoHS and lead-free compliance per distributor listings (DigiKey, Mouser, Heisener). AEC-Q100 not applicable - this is a non-automotive AC-DC switcher IC. Halogen-free status not explicitly stated in verified data.
