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NXP Semiconductors SSL5021BTS/1X
- Part No.:
- SSL5021BTS/1X
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- SC-74, SOT-457
- Datasheet:
-
SSL5021BTS/1X.pdf
- Description:
- IC LED DRIVER RGLTR 2A SC74
- Quantity:
- Payment:
- Shipping:
Inventory:4,128
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Product details
Overview
SSL5021BTS from NXP Semiconductors is a non-isolated, boundary conduction mode (BCM) buck LED driver IC with integrated MOSFET/bipolar switch, designed for universal mains (90–277 VAC) non-dimmable LED lighting up to 25 W. It delivers low-ripple output current (< ±5 %), operates without auxiliary supply via resistor-startup, and achieves up to 91 % efficiency in compact TSOP6 packaging.
For engineers reviewing the SSL5021BTS datasheet, SSL5021BTS pinout, SSL5021BTS application, or SSL5021BTS equivalent, key selection criteria include its BCM on-time regulation, thermal foldback capability via DEMOVP, valley-switching for ZCS turn-on, ultra-low operating current (<150 µA), and built-in auto-recovery protections including OCP, OVP, OSP, UVLO, and OTP.
Technical Context
The SSL5021BTS implements a source/emitter-switch BCM topology with adaptive switching frequency, enabling precise constant-current control through on-time regulation referenced to an internal 0.410 V average ISNS voltage. Its valley detection circuit monitors the DEMOVP pin to trigger zero-current switching at the inductor demagnetization valley, minimizing turn-on losses.
Protections are tightly integrated: cycle-by-cycle OCP uses leading-edge blanking and a 1.00 V ISNS threshold; OVP triggers after three consecutive DEMOVP cycles exceeding 1.81 V; OTP activates at 150 °C junction temperature with restart at 118 °C; and UVLO engages below 9.9 V on VCC with 12.65 V startup hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC operating range | 9.5–16 V - powers IC directly from rectified mains via external resistor; internal clamp limits max to 15.8 V |
| RDS(on) (25 °C) | 0.75 Ω - enables high-efficiency switching with low conduction loss in integrated MOSFET |
| Max output power | 25 W - supports universal AC input (90–277 VAC) non-dimmable LED lamps |
| Output current ripple | < ±5 % - ensures stable illumination without visible flicker in low-ripple lighting designs |
| Operating supply current | 125 µA typical - minimizes standby power loss and simplifies VCC capacitor sizing |
| Valley detection accuracy | −3.8 V/µs dV/dt sensitivity - reliably identifies demagnetization valley for ZCS turn-on |
| OVP threshold | 1.81 V typical on DEMOVP - sets accurate LED overvoltage trip point via external resistive divider |
| Thermal shutdown | 150 °C junction - protects against thermal runaway; resumes operation at 118 °C |
Pinout & Package
SSL5021BTS is housed in a plastic surface-mounted TSOP6 package (SOT457), measuring 2.9 × 1.5 × 1.05 mm with 0.95 mm lead pitch and exposed thermal pad for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISNS (1) | Current sense input | Monitors inductor peak current via external sense resistor; triggers OCP at 1.00 V threshold |
| VCC (2) | Supply voltage input | Accepts 9.5–16 V; includes internal clamp and UVLO (9.9 V) with 12.65 V startup |
| SW (3) | Internal switch drain | Drives buck inductor directly; RDS(on) = 0.75 Ω @ 25 °C; handles ±2 A triangle-wave current |
| DEMOVP (4) | Demagnetization/OVP/foldback input | Detects valley for ZCS, sets OVP threshold (1.81 V), and enables thermal foldback via PTC/NTC |
| GND (5) | Ground reference | Common return for all analog and power paths; critical for stable current sensing and protection timing |
| COMP (6) | Loop compensation node | Provides error amplifier output for stability tuning; clamped at 4.7 V; drives 4.0 µA typical |
Key Features
| Feature | Design Value |
|---|---|
| Boundary Conduction Mode (BCM) control | Enables constant-current accuracy <±3% across line/load while optimizing EMI and inductor size |
| Valley-switching with ZCS | Reduces switching losses by triggering SW turn-on at inductor current zero-crossing detected via DEMOVP |
| Single-resistor VCC startup | Eliminates auxiliary winding or dV/dt supply - simplifies BOM and enables use of off-the-shelf inductors |
| Auto-recovery protection suite | Includes UVLO, cycle-by-cycle OCP, OTP, OVP, and OSP - all reset automatically after fault removal |
| Thermal foldback via DEMOVP | Allows optional PTC/NTC connection to reduce LED current linearly above 1.64 V threshold before full OTP shutdown |
| Low-ripple current regulation | Delivers <±5% output current ripple - meets stringent requirements for flicker-free general lighting |
Applications
| LED Tube Replacement | Downlight Retrofit |
|---|---|
Use Scenario: Replacing fluorescent T8 tubes in commercial ceiling fixtures using universal AC input (90–277 VAC) without dimming capability. IC Role / Device Role / Timing Role: SSL5021BTS acts as the primary buck controller, regulating constant current to parallel LED strings while maintaining <±5% ripple under varying line conditions. Use Value: Enables compact single-layer PCB design with minimal BOM count, eliminating need for transformer or auxiliary supply - reducing retrofit cost and form factor. | Use Scenario: Upgrading enclosed downlights in residential kitchens and hallways with non-isolated, high-PF LED drivers compatible with existing wall switches including Hotaru indicator lights. IC Role / Device Role / Timing Role: SSL5021BTS provides boundary-mode current regulation and valley-synchronized switching to sustain >0.9 PF and <15% THD without active PFC stage. Use Value: Achieves 91% efficiency and thermal foldback protection - extending LED lifetime in thermally constrained enclosures while meeting IEC 61000-3-2 Class C harmonics limits. |
| Streetlight Auxiliary Module | Industrial Panel Indicator |
Use Scenario: Powering auxiliary LED arrays in solar-charged streetlight controllers where space and component count are constrained, and input voltage varies widely (e.g., 12–36 V DC bus). IC Role / Device Role / Timing Role: SSL5021BTS operates as a wide-input buck regulator, leveraging adaptive frequency and on-time control to maintain stable current despite large input transients. Use Value: Delivers robust operation with auto-recovery OVP/OSP - preventing latch-up during lightning-induced surges or battery overvoltage events in outdoor environments. | Use Scenario: Driving status-indicator LEDs on industrial HMIs and PLC panels powered directly from 24 V DC rails with strict EMC and reliability requirements. IC Role / Device Role / Timing Role: SSL5021BTS serves as a precision current source with ultra-low 125 µA operating current, enabling always-on indicators without excessive heat buildup. Use Value: Provides OTP and UVLO protection - ensuring fail-safe shutdown during brownouts or ambient temperature excursions beyond 85 °C in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SSL5031BTS | Includes high-temperature foldback function; identical pinout and BCM architecture | Better suited for high-power-factor, low-THD applications requiring thermal derating above 85 °C ambient | Select when thermal foldback is mandatory and OTP reset behavior must match SSL5021BTS baseline |
| SSL5021CTS | Same core controller but in SO8 package; lacks integrated switch - requires external MOSFET | Offers higher power scalability (>25 W) and improved thermal performance via discrete FET selection | Choose when board layout allows SO8 footprint and design requires >25 W output or custom FET optimization |
Compared with SSL5021BTS, SSL5031BTS adds mandatory thermal foldback for high-temperature reliability in enclosed luminaires, while SSL5021CTS trades integration for flexibility - enabling higher power and discrete FET selection but increasing BOM count and layout complexity.
Availability
SSL5021BTS is available at Aetrix Electronics and suitable for LED tube replacement, downlight retrofit, streetlight auxiliary modules, and industrial panel indicators requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for SSL5021BTS includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The SSL5021BTS belongs to NXP's SSL (Solid-State Lighting) controller family, engineered specifically for cost-sensitive, non-isolated LED drivers targeting universal AC mains input with high efficiency, low ripple, and integrated protection.
FAQ
What is the maximum input voltage range supported by the SSL5021BTS?
The SSL5021BTS supports universal AC mains input from 90 VAC to 277 VAC, rectified to a DC bus. Its VCC supply operates from 9.5 V to 16 V, with internal clamping limiting the maximum to 15.8 V. This enables direct resistor-based startup without auxiliary winding - a key enabler for compact, low-cost SSL5021BTS designs in non-isolated LED lighting.
Does the SSL5021BTS require an external MOSFET, or is the switch integrated?
The SSL5021BTS integrates a power MOSFET with RDS(on) of 0.75 Ω at 25 °C on pin SW (3), eliminating the need for an external switch in ≤25 W applications. This integration reduces BOM count, PCB area, and layout complexity - a defining feature of the SSL5021BTS versus controller-only alternatives like SSL5021CTS.
How does the SSL5021BTS achieve low output current ripple?
The SSL5021BTS achieves <±5% output current ripple through Boundary Conduction Mode (BCM) operation with precise on-time regulation, valley-switching for zero-current turn-on, and optimized inductor sizing enabled by adaptive frequency. These features collectively minimize current variation across the AC line cycle - a core specification confirmed in the SSL5021BTS datasheet and essential for flicker-free lighting.
Can the SSL5021BTS be used with bipolar junction transistors (BJTs) instead of MOSFETs?
Yes, the SSL5021BTS is explicitly designed for both MOSFET and bipolar transistor compatibility, as stated in its functional description. Its source/emitter-switch topology and drive characteristics support either device type - with Figure 4 in the SSL5021BTS datasheet showing the validated bipolar application circuit. This dual compatibility gives designers flexibility in cost and thermal trade-offs.
What protection features are built into the SSL5021BTS?
The SSL5021BTS includes five auto-recovery protections: UnderVoltage LockOut (UVLO), cycle-by-cycle OverCurrent Protection (OCP), internal OverTemperature Protection (OTP), Output OverVoltage Protection (OVP), and Output Short Protection (OSP). All are implemented in hardware with defined thresholds - e.g., OCP triggers at 1.00 V on ISNS, OVP at 1.81 V on DEMOVP, and OTP at 150 °C - ensuring robust operation without firmware dependency.
SSL5021BTS/1X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- GreenChip™
- Package/Case:
- SC-74, SOT-457
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 9.5V
- Voltage - Supply (Max):
- 16V
- Voltage - Output:
- -
- Current - Output / Channel:
- 2A (Switch)
- Frequency:
- -
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -40°C ~ 160°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-74
SSL5021BTS/1X FAQ
1.How can I place an order for SSL5021BTS/1X through Aetrix?
Please submit a Request for Quotation (RFQ) for SSL5021BTS/1X on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SSL5021BTS/1X reliable?
The price and inventory of SSL5021BTS/1X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SSL5021BTS/1X is usually 5 days.
3.What payment methods are accepted for SSL5021BTS/1X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SSL5021BTS/1X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SSL5021BTS/1X?
SSL5021BTS/1X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SSL5021BTS/1X order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SSL5021BTS/1X?
For technical support, including SSL5021BTS/1X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SSL5021BTS/1X requirements.
6.How does Aetrix verify that SSL5021BTS/1X is sourced from the original manufacturer or authorized distributors?
All SSL5021BTS/1X products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SSL5021BTS/1X meets industry standards.
7.What is the process for return or replacement of SSL5021BTS/1X?
All SSL5021BTS/1X units undergo pre-shipment inspection (PSI). If there is an issue with SSL5021BTS/1X, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SSL5021BTS/1X part is unused and in its original packaging.
Return procedure for SSL5021BTS/1X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SSL5021BTS/1X Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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