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Renesas IW3637-03
- Part No.:
- IW3637-03
- Manufacturer:
- Renesas
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
IW3637-03.pdf
- Description:
- OFF-LINE BUCK LED DRIVER CONTROL
- Quantity:
- Payment:
- Shipping:
Inventory:1,823
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Product details
Overview
The IW3637-03 from Renesas Electronics is a high-performance off-line LED driver controller for buck topology applications, featuring analog 0–1.8 V dimming interface (DIM2), ±3% output current regulation via PrimAccurate™ sensing, and 72/90 kHz quasi-resonant PWM switching - deployed in commercial T8 fixtures and 0–10 V dimmable LED drivers.
For engineers reviewing the IW3637-03 datasheet, IW3637-03 pinout, IW3637-03 application, or IW3637-03 equivalent, key selection considerations include its SOIC-8 package, dual-dimming support (PWM + analog), light-off mode with soft-off, configurable dimming curve (linear/log), and built-in fault protections including output open/short, over-voltage, and under-voltage detection.
Technical Context
The IW3637-03 implements cycle-by-cycle peak current control using ISENSE input and voltage feedback via VSENSE, enabling stable regulation without external compensation. Its active start-up scheme supports both enhancement- and depletion-mode FETs, with VIN pin monitoring input bus voltage to initiate startup.
It integrates PrimAccurate™ sensing to eliminate direct current-sense resistors and achieves flicker-free operation by minimizing low-frequency ripple when paired with a front-end boost converter. The device supports two independent dimming inputs: DIM1 for primary PWM and NTC/DIM2 configured as analog 0–1.8 V interface per ordering option.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | Buck only - no flyback capability in IW3637-03 variant. |
| Dimming Interface | DIM1: dedicated PWM input; NTC/DIM2: analog 0–1.8 V dimming input (per ordering option). |
| Current Regulation | ±3% accuracy across line/load/temperature - achieved without shunt resistor or external loop compensation. |
| Switching Frequency | Configurable 72 kHz or 90 kHz quasi-resonant operation - reduces EMI and improves efficiency. |
| VCC Operating Range | 7.5 V to 30 V - enables compatibility with wide-range auxiliary supplies and simplifies bias design. |
| Fault Protections | Output open/short, output over-voltage, input under-voltage, and over-temperature with derating - ensures robust field reliability. |
| Light-off Mode | Soft-off function before shutdown - maintains IC functionality at minimal standby power during dim-to-off transitions. |
Pinout & Package
Package: 8-lead SOIC-8 (standard JEDEC MS-012AC), thermal resistance θJA = 170°C/W, θJC = 45°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NTC/DIM2 | Analog dimming input | Accepts 0–1.8 V analog signal for secondary dimming control; not used for NTC or PWM in IW3637-03. |
| 2 - ISENSE | Current sense input | Provides cycle-by-cycle peak current limit and configuration during startup; connects to source of external MOSFET. |
| 3 - GND | Ground reference | Common return for all analog and digital circuitry; must be low-impedance connection to power ground plane. |
| 4 - OUTPUT | MOSFET gate driver output | Drives external high-side N-channel MOSFET; capable of 150 W output in SOIC-8 package. |
| 5 - VCC | IC power supply | Supplies internal circuitry; requires local 10 µF ceramic + 10 µF electrolytic bypass near pin. |
| 6 - VSENSE | Voltage sense input | Monitors output voltage for regulation and fault detection; also configures IC during startup. |
| 7 - VIN | Input bus monitor | Senses rectified AC or boost converter output to enable active start-up and UVLO protection. |
| 8 - DIM1 | PWM dimming input | Accepts standard 100 Hz–10 kHz PWM signal for primary dimming control; TTL/CMOS compatible. |
Key Features
| Feature | Design Value |
|---|---|
| PrimAccurate™ sensing | Enables ±3% LED current regulation without current-sense resistor or external compensation network. |
| Configurable dimming curve | Linear or logarithmic response selectable - matches human eye perception or system control requirements. |
| Soft-off before light-off | Gradually ramps down LED current prior to full shutdown - eliminates visible pop-on/pop-off artifacts. |
| Multi-function pins | NTC/DIM2 and VSENSE serve dual roles (dimming/config) - reduces external component count and board space. |
| Quasi-resonant switching | Reduces switching losses and EMI at 72/90 kHz - improves efficiency and eases EMC compliance in lighting designs. |
Applications
| 0–10 V Dimmable LED Drivers | Commercial T8 LED Fixtures |
|---|---|
Use Scenario: Integrated into constant-current LED drivers for office and retail lighting where building automation systems require 0–10 V analog dimming signals. IC Role / Device Role / Timing Role: Primary LED current controller with analog dimming interface (NTC/DIM2) and PWM dimming fallback (DIM1). Use Value: Eliminates need for separate 0–10 V-to-PWM converter IC; supports seamless integration with legacy DALI or KNX gateways via simple voltage scaling. | Use Scenario: Used in retrofit T8 LED tube drivers where compact size, thermal constraints, and flicker-free performance are critical. IC Role / Device Role / Timing Role: Buck-mode LED controller with active start-up and soft-off - enables fast turn-on and silent dim-to-off behavior. Use Value: Achieves <1% residual ripple at 100% dimming and <0.1% at 1% dimming - meets IEEE 1789 flicker mitigation guidelines. |
| Wireless Smart Lighting Systems | Industrial Fixture Drivers |
Use Scenario: Paired with Bluetooth/Zigbee modules in smart ceiling fixtures requiring synchronized multi-channel dimming. IC Role / Device Role / Timing Role: Dual-dimming interface receiver - DIM1 accepts MCU-generated PWM; NTC/DIM2 accepts analog command from wireless gateway. Use Value: Enables hybrid dimming control: coarse analog setting + fine PWM adjustment - improves resolution beyond 10-bit DAC limitations. | Use Scenario: Deployed in IP65-rated outdoor LED streetlight drivers operating in -40°C to +85°C ambient with surge immunity. IC Role / Device Role / Timing Role: Fault-tolerant LED controller with over-temperature derating, output short/open protection, and UVLO. Use Value: Maintains regulated current down to -40°C and derates linearly above 110°C junction - extends lifetime in thermally constrained enclosures. |
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 analog dimming input; requires external current-sense resistor. | Targeted at cost-sensitive non-dimmable or PWM-only applications; lacks soft-off and configurable dimming curve. | Select when analog dimming and flicker-free dim-to-off are not required and BOM cost is prioritized. |
| Diodes Incorporated AL1676S16-13 | Supports flyback/buck-boost; includes integrated high-voltage MOSFET; no NTC/DIM2 analog interface. | Designed for isolated AC-input applications; not suitable for buck-only or analog-dimming-focused designs like IW3637-03. | Choose for isolated topologies or when integrated switch reduces board area - but verify absence of analog dimming compatibility. |
Compared with NCL30160DR2G and AL1676S16-13, the IW3637-03 uniquely delivers analog 0–1.8 V dimming in buck topology with ±3% regulation, soft-off, and quasi-resonant switching - making it optimal for high-fidelity commercial dimming systems where flicker, noise, and control flexibility are critical.
Availability
IW3637-03 is available at Aetrix Electronics and suitable for 0–10 V dimmable LED drivers, commercial T8 LED fixtures, and wireless smart lighting systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for IW3637-03 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 SoC solutions for automotive, industrial, and IoT markets.
The IW3637-03 belongs to Renesas' PrimAccurate™ LED driver controller family, engineered specifically for high-accuracy, flicker-free, and multi-interface dimmable SSL lighting in space-constrained buck applications.
FAQ
What dimming interfaces does the IW3637-03 support?
The IW3637-03 supports two independent dimming interfaces: DIM1 accepts standard PWM signals (100 Hz–10 kHz), while NTC/DIM2 is configured as an analog 0–1.8 V input per its ordering option. It does not support NTC or PWM on pin 1 - only analog dimming. This dual-interface capability enables flexible control architectures in commercial and smart lighting systems using the IW3637-03.
Does the IW3637-03 support flyback topology?
No, the IW3637-03 is specified exclusively for buck topology operation. The datasheet's ordering table confirms "Buck Topology" for this variant. Flyback support is reserved for other members of the family such as IW3637-05. Using IW3637-03 in flyback configurations is not validated and may result in unstable regulation or protection faults.
What is the purpose of the soft-off feature in the IW3637-03?
The soft-off feature in the IW3637-03 gradually reduces LED current before entering light-off mode, eliminating abrupt turn-off artifacts and audible coil noise. It operates with minimal standby power consumption and is enabled by default. This behavior is confirmed in the Product Summary Rev. 1.5 and differentiates IW3637-03 from controllers lacking controlled dim-to-off sequencing.
Can the IW3637-03 operate without an external current-sense resistor?
Yes, the IW3637-03 uses Renesas' PrimAccurate™ technology to achieve ±3% output current regulation without an external current-sense resistor. It relies on ISENSE pin sensing through the MOSFET's RDS(on) or a small sense FET, eliminating shunt losses and PCB area. This capability is explicitly stated in the Product Summary and applies directly to the IW3637-03 variant.
What protection features are integrated into the IW3637-03?
The IW3637-03 integrates output open-circuit, output short-circuit, output over-voltage, input under-voltage, and over-temperature protections with current derating. These are hardware-based, cycle-by-cycle monitored functions - no firmware or external supervision required. All protections are active and verified for the IW3637-03 in buck configuration per the official Renesas Product Summary Rev. 1.5.
IW3637-03 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:
- 20mA
- Frequency:
- 72kHz, 90kHz
- Dimming:
- Analog, PWM
- Applications:
- General Purpose
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
IW3637-03 FAQ
1.How can I place an order for IW3637-03 through Aetrix?
Please submit a Request for Quotation (RFQ) for IW3637-03 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 IW3637-03 reliable?
The price and inventory of IW3637-03 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IW3637-03 is usually 5 days.
3.What payment methods are accepted for IW3637-03?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IW3637-03 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IW3637-03?
IW3637-03 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IW3637-03 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 IW3637-03?
For technical support, including IW3637-03 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IW3637-03 requirements.
6.How does Aetrix verify that IW3637-03 is sourced from the original manufacturer or authorized distributors?
All IW3637-03 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 IW3637-03 meets industry standards.
7.What is the process for return or replacement of IW3637-03?
All IW3637-03 units undergo pre-shipment inspection (PSI). If there is an issue with IW3637-03, 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 IW3637-03 part is unused and in its original packaging.
Return procedure for IW3637-03:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IW3637-03 Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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