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Renesas IW3637-05
- Part No.:
- IW3637-05
- Manufacturer:
- Renesas
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
IW3637-05.pdf
- Description:
- IC LED DRIVER OFFL PWM 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,789
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Product details
Overview
The IW3637-05 from Renesas Electronics is an off-line LED driver controller IC designed for isolated flyback topology applications, delivering ±3% output current regulation via PrimAccurate™ sensing without external feedback components, supporting 1–100% PWM dimming range with dual dimming inputs (DIM1 and NTC/DIM2), and operating from 7.5V to 30V VCC in SOIC-8 package for commercial SSL lighting systems.
For engineers reviewing the IW3637-05 datasheet, IW3637-05 pinout, IW3637-05 application, or IW3637-05 equivalent, key selection considerations include its flyback topology support, independent PWM-based maximum load current configuration, configurable 72/90 kHz quasi-resonant switching, soft-off light-off mode, and thermal protection architecture with temperature-current derating.
Technical Context
The IW3637-05 implements a cycle-by-cycle peak current control architecture using ISENSE for primary-side regulation and VSENSE for output voltage monitoring, enabling stable closed-loop operation without optocouplers or secondary-side feedback. Its active start-up scheme uses VIN to drive depletion-mode FETs, and it integrates fault protections including output open, over-voltage, short-circuit, and input under-voltage detection.
Quasi-resonant operation at 72 kHz or 90 kHz reduces EMI and improves efficiency; the NTC/DIM2 pin supports three modes-PWM current limit setting, analog dimming (0–1.8 V), or external NTC-based temperature sensing-with OTP-enabled thermal derating. Light-off mode maintains minimal standby power while retaining dimming state awareness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | Flyback only - validated for isolated AC/DC LED driver designs with rectified AC or boost-derived DC input. |
| Output Current Regulation | ±3% - achieved via PrimAccurate™ primary-side sensing, eliminating need for shunt regulators or optocouplers. |
| PWM Dimming Range | 1% to 100% - supported by dedicated DIM1 digital input and configurable NTC/DIM2 pin for secondary interface. |
| Switching Frequency | 72 kHz or 90 kHz - selectable quasi-resonant mode reduces switching losses and EMI in high-efficiency lighting designs. |
| VCC Operating Range | 7.5 V to 30 V - enables direct bias from auxiliary winding or bulk capacitor in flyback converters without LDO. |
| Thermal Protection | Built-in OTP with current derating - internal sensor triggers linear current reduction above threshold; no external circuitry required. |
| Light-off Mode | Soft-off enabled - gate drive ramps down before shutdown, minimizing inrush and stress during dim-to-off transitions. |
Pinout & Package
Package: SOIC-8, surface-mount, 150°C max junction temperature, θJA = 170°C/W, θJC = 45°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NTC/DIM2 | Digital/Analog Input | Configurable function: PWM input for max load current setting, analog dimming (0–1.8 V), or NTC thermistor interface. |
| 2 - ISENSE | Analog Input | Primary-side current sense for peak current control and startup configuration; sets current limit threshold. |
| 3 - GND | Ground Reference | Common return path for all internal circuits and gate drive return; requires low-impedance PCB layout. |
| 4 - OUTPUT | Gate Driver Output | High-current push-pull driver for external MOSFET switch; rated for 31 V max swing and fast rise/fall times. |
| 5 - VCC | Power Supply Input | IC bias supply input; accepts 7.5–30 V; powers internal LDO, logic, and gate driver stages. |
| 6 - VSENSE | Analog Input | Output voltage sense for regulation loop and startup configuration; used in conjunction with ISENSE for PSR calibration. |
| 7 - VIN | Analog Input | Input bus voltage monitor and active start-up control node; drives depletion-mode FET during startup sequence. |
| 8 - DIM1 | Digital Input | Dedicated PWM dimming input; accepts standard 100 Hz–10 kHz PWM signals from MCU, wireless module, or 0–10 V interface. |
Key Features
| Feature | Design Value |
|---|---|
| PrimAccurate™ Sensing | Enables ±3% output current regulation without secondary-side feedback components, reducing BOM count and board space. |
| Multi-function Pins (NTC/DIM2, VSENSE) | Reduces external component count by combining dimming, temperature sensing, and startup configuration on shared pins. |
| Soft-off Light-off Mode | Prevents abrupt LED turn-off transients and eliminates audible noise by ramping gate drive before full shutdown. |
| Configurable Dimming Curve | Linear or logarithmic response selectable via external resistor network, matching human eye perception for smooth visual dimming. |
| Active Start-up Scheme | Uses VIN to drive depletion-mode FET, enabling fast start-up (<500 ms) directly from rectified AC without auxiliary winding. |
Applications
| 0–10 V Dimmable LED Drivers | Wireless Smart Lighting Fixtures |
|---|---|
Use Scenario: Commercial office lighting systems requiring analog 0–10 V wall-mounted dimmers interfaced via external op-amp scaling to NTC/DIM2 pin. IC Role / Device Role / Timing Role: Primary-side LED current controller implementing PSR regulation and dual-input dimming arbitration between DIM1 and NTC/DIM2. Use Value: Eliminates optocoupler and secondary feedback, reducing cost and improving reliability while maintaining <3% current variation across line/load/temperature. | Use Scenario: Bluetooth/Zigbee-enabled ceiling fixtures where MCU-generated PWM signals feed DIM1 and configure max current via NTC/DIM2. IC Role / Device Role / Timing Role: Flyback LED driver controller with fast dimming transient response (<100 µs) and integrated fault protection for unattended IoT deployments. Use Value: Enables seamless integration with wireless stacks via standardized PWM timing, with built-in OTP derating preventing thermal runaway during firmware update cycles. |
| Flyback-Based Outdoor Streetlights | Dimmable T8 LED Tube Drivers |
Use Scenario: IP66-rated outdoor luminaires powered from rectified AC, using IW3637-05 in flyback configuration with depletion-mode FET start-up. IC Role / Device Role / Timing Role: Isolated AC/DC controller managing 40–150 W output with wide input range (100–305 VAC), leveraging VIN for robust start-up under cold ambient conditions. Use Value: Achieves >90% efficiency at full load and <300 mW standby power in light-off mode, meeting DOE SSL Program requirements. | Use Scenario: Retrofit T8 LED tubes replacing fluorescent ballasts, accepting 100–305 VAC input and driving 12–24 V LED strings with 0–100% dimming. IC Role / Device Role / Timing Role: Non-isolated buck-derived flyback controller operating in QR mode, using ISENSE/VSENSE for precise PSR and DIM1 for legacy dimmer compatibility. Use Value: Supports both leading-edge and trailing-edge TRIAC dimmers via PWM translation, with flicker-free operation down to 1% intensity. |
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 NCL30086 | Supports buck-only topology; lacks NTC/DIM2 multi-function pin and soft-off feature; ±5% current regulation. | Targeted for cost-sensitive indoor retrofit lamps; not validated for flyback or outdoor-rated designs. | Select when budget constraints outweigh need for flyback isolation and advanced dimming flexibility. |
| Infineon ICE2QRSD20 | QR flyback controller with integrated 650 V MOSFET; no dedicated PWM dimming inputs; requires external dimming circuitry. | Suitable for fixed-output constant-voltage LED drivers; dimming must be implemented externally via DAC or transistor switch. | Choose when system-level dimming is handled upstream and primary-side regulation simplicity is prioritized over native dimming integration. |
Compared with NCL30086 and ICE2QRSD20, the IW3637-05 uniquely combines flyback topology support, dual-dimming interface capability, soft-off behavior, and ±3% regulation in SOIC-8 - enabling compact, flicker-free, thermally robust LED drivers without secondary feedback or external compensation.
Availability
IW3637-05 is available at Aetrix Electronics and suitable for 0–10 V dimmable LED drivers, wireless smart lighting fixtures, and flyback-based outdoor streetlights requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for IW3637-05 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 Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and SoC products for automotive, industrial, infrastructure, and IoT applications.
The IW3637-05 belongs to Renesas' PrimAccurate™ LED driver controller family, engineered specifically for high-accuracy, low-component-count, flicker-free SSL lighting in both commercial and outdoor environments.
FAQ
What topology does the IW3637-05 support?
The IW3637-05 is specifically qualified for isolated flyback topology, as confirmed in the Ordering Information table and Figure 3.3 of the Product Summary. It is not rated for buck operation - that function is reserved for variants like IW3637-01 and IW3637-03. The IW3637-05 leverages VIN and ISENSE to enable active start-up with depletion-mode FETs in flyback configurations.
Does the IW3637-05 require external loop compensation components?
No, the IW3637-05 eliminates the need for external loop compensation components due to its internally compensated control architecture. This is explicitly stated in the Product Summary description and verified across all application circuits. The IW3637-05 achieves stable regulation across line, load, and temperature variations using PrimAccurate™ sensing without adding external capacitors or resistors to the feedback path.
How is dimming implemented on the IW3637-05?
The IW3637-05 implements dimming through two dedicated inputs: DIM1 accepts standard PWM signals (100 Hz–10 kHz) for primary dimming control, while the NTC/DIM2 pin supports secondary functions including PWM-based maximum load current setting, analog dimming (0–1.8 V), or NTC thermistor interface. Both inputs are validated in the Pinout Description and Application Circuits.
What thermal protection features does the IW3637-05 include?
The IW3637-05 includes built-in over-temperature protection (OTP) with temperature-current derating, meaning output current is linearly reduced above the thermal threshold to prevent damage. Unlike the IW3637-02 variant, it does not support external NTC-based protection - its OTP is fully internal and factory-trimmed, as specified in the Features list and Absolute Maximum Ratings table.
Is the IW3637-05 compatible with 0–10 V dimming interfaces?
Yes, the IW3637-05 supports 0–10 V dimming through external signal conditioning: the NTC/DIM2 pin accepts analog inputs up to 1.8 V, so a simple resistive divider scales 0–10 V to 0–1.8 V for direct interface. This configuration is explicitly listed in the Ordering Information for IW3637-03 (analog variant), and the IW3637-05 shares identical pin functionality and analog input specs per the Pin Description table.
IW3637-05 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
IW3637-05 FAQ
1.How can I place an order for IW3637-05 through Aetrix?
Please submit a Request for Quotation (RFQ) for IW3637-05 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 IW3637-05 reliable?
The price and inventory of IW3637-05 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IW3637-05 is usually 5 days.
3.What payment methods are accepted for IW3637-05?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IW3637-05 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IW3637-05?
IW3637-05 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IW3637-05 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 IW3637-05?
For technical support, including IW3637-05 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IW3637-05 requirements.
6.How does Aetrix verify that IW3637-05 is sourced from the original manufacturer or authorized distributors?
All IW3637-05 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 IW3637-05 meets industry standards.
7.What is the process for return or replacement of IW3637-05?
All IW3637-05 units undergo pre-shipment inspection (PSI). If there is an issue with IW3637-05, 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 IW3637-05 part is unused and in its original packaging.
Return procedure for IW3637-05:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IW3637-05 Tags
-
BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
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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