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Renesas IW3637-01
- Part No.:
- IW3637-01
- Manufacturer:
- Renesas
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
IW3637-01.pdf
- Description:
- IC LED DRIVER OFFL PWM 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,576
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Product details
Overview
The IW3637-01 from Renesas Electronics is a high-performance off-line LED driver controller for non-isolated buck topology applications, featuring PrimAccurate™ current sensing (±3% regulation), 1–100% PWM dimming range, dedicated DIM1 and NTC/DIM2 pins, and soft-off light-off mode with 100ms delay. It operates from 7.5V to 30V VCC and drives external MOSFETs in SSL lighting systems requiring flicker-free output.
For engineers reviewing the IW3637-01 datasheet, IW3637-01 pinout, IW3637-01 application, or IW3637-01 equivalent, this controller delivers verified dimming interface flexibility (PWM + configurable analog/NTC), quasi-resonant switching at 72/90 kHz, built-in fault protections (OVP, OCP, UVP, OTP), and SOIC-8 package compatibility with no external loop compensation required.
Technical Context
The IW3637-01 implements cycle-by-cycle peak current control via ISENSE pin and output voltage sensing via VSENSE, enabling stable regulation without optocouplers or secondary-side feedback. Its active start-up scheme uses VIN to drive depletion- or enhancement-mode FETs, supporting both rectified AC and boost-derived DC inputs.
It integrates dual-dimming capability: DIM1 accepts primary PWM signals (e.g., from MCU/wireless modules), while NTC/DIM2 supports independent maximum load current setting via PWM or analog 0–1.8V input - though IW3637-01 specifically enables the PWM output current control option per ordering table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 7.5V to 30V - powers IC directly from auxiliary supply or bias winding, eliminating need for linear regulator. |
| Output Current Regulation | ±3% - achieved via PrimAccurate™ sensing, enabling precise LED current control without shunt or op-amp feedback. |
| PWM Dimming Range | 1% to 100% - supports deep dimming in commercial T8 and smart lighting without visible flicker. |
| Switching Frequency | 72 kHz or 90 kHz - selectable quasi-resonant operation reduces EMI and improves efficiency in buck converters. |
| Topology Support | Buck only - IW3637-01 variant is factory-configured for buck topology, not flyback or analog/NTC modes. |
| Light-off Delay | 100 ms - soft-off transition ensures smooth LED fade-out before entering ultra-low-power light-off mode. |
| Fault Protections | Output open/short, over-voltage, under-voltage, over-temperature - internal monitoring eliminates need for discrete protection circuitry. |
Pinout & Package
Package: SOIC-8, surface-mount, 150°C max junction temperature, θJA = 170°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NTC/DIM2 | Digital Input | Configured as PWM input for maximum load current setting (IW3637-01 function); voltage >1V disables PWM mode. |
| 2 - ISENSE | Analog Input | Senses primary-side current for cycle-by-cycle control and startup configuration; sets current limit threshold. |
| 3 - GND | Ground Reference | Common return path for all analog and digital circuits; must be low-impedance PCB plane. |
| 4 - OUTPUT | Gate Driver Output | Drives external N-channel MOSFET gate; rated for 31V max swing and optimized for 150W buck designs. |
| 5 - VCC | Power Supply | Accepts 7.5–30V DC; powers internal circuitry and gate driver; includes UVLO and overvoltage clamp. |
| 6 - VSENSE | Analog Input | Monitors output voltage for regulation and fault detection; also configures device during startup sequence. |
| 7 - VIN | Analog Input | Controls active start-up FET and senses input bus voltage; enables fast start-up from rectified AC or boost output. |
| 8 - DIM1 | Digital Input | Dedicated PWM dimming input; accepts standard 0–5V logic-level signals from MCUs, wireless modules, or 0–10V interfaces. |
Key Features
| Feature | Design Value |
|---|---|
| PrimAccurate™ Sensing | Enables ±3% LED current regulation without secondary-side feedback components or external op-amps. |
| Multi-function Pins (DIM2, VSENSE, VIN) | Reduce BOM count by combining configuration, sensing, and start-up functions into shared pins. |
| Soft-off Light-off Mode | Reduces standby power to minimal level while maintaining system readiness; 100ms fade-out prevents abrupt LED turn-off. |
| Quasi-Resonant Switching | Minimizes switching losses and EMI at 72/90 kHz, improving efficiency and easing EMI filter design in compact buck drivers. |
| Built-in Fault Protection Suite | Integrates OVP, OCP, UVP, and OTP - eliminates need for discrete comparators, timers, or thermal sensors in most SSL designs. |
Applications
| 0–10V Dimmable LED Drivers | Commercial T8 LED Fixtures |
|---|---|
Use Scenario: Retrofitting fluorescent T8 fixtures with LED tubes powered by constant-current drivers compliant with DALI or 0–10V analog dimming standards. IC Role / Device Role / Timing Role: IW3637-01 acts as the primary AC/DC controller, regulating LED current and interpreting 0–10V analog signal via DIM1 pin as dimming command. Use Value: Eliminates need for isolated feedback or external compensation, reducing bill-of-materials and board space while achieving <1% residual ripple. | Use Scenario: Integrated LED tube drivers where space, thermal performance, and deep dimming down to 1% are critical. IC Role / Device Role / Timing Role: IW3637-01 serves as the buck-mode LED current controller with integrated soft-start and fast transient response to dimming commands. Use Value: 100ms light-off delay and soft-off behavior ensure smooth visual transition, meeting IEC TR 61547-1 flicker requirements for office lighting. |
| Wireless Smart Lighting Systems | Industrial LED Area Lighting |
Use Scenario: Battery- or USB-powered smart bulbs using BLE/Zigbee modules to send PWM dimming signals to driver ICs. IC Role / Device Role / Timing Role: IW3637-01 receives PWM from MCU or wireless SoC on DIM1 pin and adjusts LED current in real time with <10 µs response latency. Use Value: Dedicated DIM1 input and independent DIM2-based max-current control allow dynamic brightness and lumen ceiling adjustment without firmware changes. | Use Scenario: High-bay and parking garage luminaires requiring robust operation across -40°C to +85°C ambient and immunity to line transients. IC Role / Device Role / Timing Role: IW3637-01 provides primary-side regulated current control with built-in OTP derating and external NTC support (via DIM2 reconfiguration in other variants, but not enabled in IW3637-01). Use Value: ±3% current regulation and 150W capability in SOIC-8 enable compact, thermally efficient designs meeting IEC 62368-1 safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NCL30160DR2G | Fixed 100 kHz frequency; no DIM2 multi-function pin; requires external compensation network. | Targeted for cost-sensitive buck LED drivers with simpler dimming (single PWM only); lacks soft-off and light-off delay. | Select when budget constraints outweigh need for advanced dimming flexibility and flicker suppression. |
| Diodes Incorporated AL1676S16-13 | Supports buck and buck-boost; includes integrated 600V MOSFET; no independent max-current PWM input (DIM2). | Used in lower-power (<30W), self-contained LED drivers where integration trumps configurability. | Choose when board space is extremely limited and integrated switch suffices for power level. |
Compared with NCL30160DR2G and AL1676S16-13, the IW3637-01 offers superior dimming architecture (dual-input PWM control), tighter regulation (±3% vs. ±5%), and system-level features like soft-off and quasi-resonant operation - making it optimal for premium commercial and smart lighting where flicker, form factor, and interface versatility matter.
Availability
IW3637-01 is available at Aetrix Electronics and suitable for 0–10V dimmable LED drivers, commercial T8 retrofit systems, and wireless smart lighting applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for IW3637-01 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
Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT markets.
The IW3637-01 belongs to Renesas' PrimAccurate™ LED driver controller family, engineered specifically for high-accuracy, low-flicker, digitally controllable SSL lighting in compact buck topologies.
FAQ
What topology does the IW3637-01 support?
The IW3637-01 is factory-configured exclusively for non-isolated buck topology operation. It does not support flyback or boost configurations. This is confirmed in the Ordering Information table, which lists "Buck Topology" for IW3637-01 and distinguishes it from IW3637-05 (flyback) and other variants. The IC's internal compensation and protection logic are optimized for buck converter waveforms and current-sense placement.
Does the IW3637-01 require external loop compensation?
No, the IW3637-01 does not require external loop compensation. Its proprietary control architecture, combined with PrimAccurate™ sensing, maintains stability across all operating conditions - including line, load, and temperature variations - without external RC networks. This is explicitly stated in the Product Summary and validated in typical application circuits where no compensation components appear on VSENSE or ISENSE paths.
What is the function of the NTC/DIM2 pin on the IW3637-01?
On the IW3637-01, the NTC/DIM2 pin is configured as a PWM input for independent maximum load current setting. As specified in the Ordering Information table, IW3637-01 enables "Independent PWM Output Current Control". Applying a PWM signal here sets the upper current limit, while holding the pin above 1V DC disables the function. It is not used for NTC sensing or analog dimming in this variant.
What dimming interfaces does the IW3637-01 support?
The IW3637-01 supports multiple dimming interfaces: primary PWM dimming via DIM1 (0–5V logic), and secondary PWM-based maximum current control via NTC/DIM2. It does not support analog 0–10V or 0–1.8V dimming on DIM2 - those functions apply only to IW3637-03 and IW3637-31. The datasheet confirms DIM1 is "PWM dimming input detection", and DIM2 is "PWM: provides maximum load current setting" for IW3637-01.
Is the IW3637-01 pin-compatible with other iW3637 variants?
Yes, all iW3637 variants - including IW3637-01, IW3637-02, and IW3637-05 - share identical SOIC-8 pinout and mechanical footprint. Pin functions are consistent across variants (e.g., DIM1 is always PWM input, ISENSE is always current sense). However, internal configuration (e.g., DIM2 function, OTP enable, light-off delay) differs by part number and cannot be changed post-manufacture.
IW3637-01 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- AC DC Offline Switcher
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 7.5V
- Voltage - Supply (Max):
- 30V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 72kHz, 90kHz
- Dimming:
- Analog, PWM
- Applications:
- LED Lighting
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
IW3637-01 FAQ
1.How can I place an order for IW3637-01 through Aetrix?
Please submit a Request for Quotation (RFQ) for IW3637-01 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 IW3637-01 reliable?
The price and inventory of IW3637-01 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IW3637-01 is usually 5 days.
3.What payment methods are accepted for IW3637-01?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IW3637-01 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IW3637-01?
IW3637-01 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IW3637-01 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 IW3637-01?
For technical support, including IW3637-01 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IW3637-01 requirements.
6.How does Aetrix verify that IW3637-01 is sourced from the original manufacturer or authorized distributors?
All IW3637-01 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 IW3637-01 meets industry standards.
7.What is the process for return or replacement of IW3637-01?
All IW3637-01 units undergo pre-shipment inspection (PSI). If there is an issue with IW3637-01, 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 IW3637-01 part is unused and in its original packaging.
Return procedure for IW3637-01:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IW3637-01 Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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