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Diodes Incorporated AZ494CM-E1
- Part No.:
- AZ494CM-E1
- Manufacturer:
- Diodes Incorporated
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AZ494CM-E1.pdf
- Description:
- IC REG BUCK ADJ 200MA DL 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,736
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Product details
Overview
AZ494CM-E1 from BCD Semiconductor Manufacturing Limited is a voltage-mode PWM controller IC designed for switching power supply regulation, featuring a 5.0 V ±1% trimmed reference, dual error amplifiers, on-chip oscillator (1–200 kHz), dead-time control comparator, and push-pull or single-ended output selection via CTRL pin - used in SMPS, backlight inverters, and battery chargers.
For engineers reviewing the AZ494CM-E1 datasheet, AZ494CM-E1 pinout, AZ494CM-E1 application, or AZ494CM-E1 equivalent, key selection criteria include reference accuracy (±1%), oscillator frequency range (1–200 kHz), dual-error-amplifier architecture, 200 mA output sink/source capability, and SOIC-16 lead-free RoHS-compliant packaging.
Technical Context
The AZ494CM-E1 implements voltage-mode PWM control with two independent error amplifiers supporting feedback from primary and secondary sides, enabling precise regulation in isolated topologies. Its internal oscillator supports master/slave operation via RT/CT pins, and the dead-time control comparator prevents shoot-through by limiting maximum duty cycle to 45%.
Output stage uses complementary transistor pairs (C1/E1 and C2/E2) configured as common-emitter or emitter-follower, selectable per application. The CTRL pin determines operation mode: grounded for single-ended/parallel outputs, tied to VREF for standard push-pull - ensuring safe gate drive sequencing without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 5.0 V ±1% at IREF = 1 mA - enables tight output regulation in DC-DC converters |
| Oscillator Frequency Range | 1–200 kHz via RT (1.8–500 kΩ) and CT (0.47 nF–10 µF) - supports wide input/output voltage and power ranges |
| Max Duty Cycle | 45% with DTC active - prevents transformer saturation and MOSFET cross-conduction in push-pull designs |
| Output Sink/Source Current | 200 mA per output - directly drives external power transistors or gate drivers without buffering |
| Supply Voltage Range | 7–36 V - accommodates wide-input industrial and automotive SMPS applications |
| Error Amplifier Gain | 70–95 dB open-loop - ensures stable loop compensation with minimal phase margin loss |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded power systems |
Pinout & Package
AZ494CM-E1 is housed in a 16-pin SOIC package (5.8 mm × 10.2 mm, 1.27 mm pitch), RoHS-compliant with lead-free finish (E1 suffix). Thermal resistance θJA = 73°C/W enables reliable operation up to 85°C ambient with moderate PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (1IN+, 1IN−) | Error Amp 1 Input | Differential feedback path for primary-side voltage regulation |
| 3 (FEEDBACK) | PWM Comparator Input | Compares error amp output against ramp signal to generate duty cycle |
| 4 (DTC) | Dead-Time Control Input | Sets minimum off-time between complementary outputs to prevent shoot-through |
| 5, 6 (CT, RT) | Oscillator Timing | RC network sets switching frequency; supports master/slave synchronization |
| 7 (GND) | Power Ground | Analog and power return reference for internal regulators and comparators |
| 8, 9 (C1, E1) | Output Transistor 1 | Collector/emitter terminals for first push-pull or single-ended output stage |
| 10, 11 (C2, E2) | Output Transistor 2 | Complementary output pair; enables full-bridge or dual-switch configurations |
| 12 (REF) | 5.0 V Reference Output | Stable 5 V ±1% source for external circuit biasing or feedback scaling |
| 13 (OUTPUT CTRL) | Mode Selection | GND = single-ended/parallel; VREF = push-pull - configures output topology |
| 14 (VCC) | Supply Input | 7–36 V operating rail; powers all internal blocks including reference and oscillators |
| 15, 16 (2IN+, 2IN−) | Error Amp 2 Input | Secondary-side feedback interface for isolated flyback or forward converters |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent error amplifiers | Supports primary + secondary feedback loops for isolated SMPS with ±2 mV offset and 650 kHz bandwidth |
| Adjustable oscillator with master/slave capability | RT/CT pins enable precise frequency setting (1–200 kHz) and synchronization across multiple controllers |
| Programmable dead-time control | DTC pin limits max duty cycle to 45%, preventing transformer core saturation and MOSFET failure |
| Configurable output topology | CTRL pin selects push-pull (for full-bridge) or single-ended (for buck/boost) operation without external logic |
| 200 mA output drive per channel | Directly interfaces with discrete power transistors or low-side gate drivers, eliminating buffer stages |
Applications
| SMPS Power Supply | Backlight Inverter |
|---|---|
Use Scenario: Regulated 12 V to 5 V/3.3 V DC-DC conversion in industrial PLCs and embedded controllers. IC Role / Device Role / Timing Role: Primary PWM controller generating gate drive signals with adjustable frequency and duty cycle. Use Value: Dual error amps allow simultaneous regulation of multiple outputs; 5 V reference improves ADC reference stability. | Use Scenario: High-frequency AC drive for CCFL or LED backlight in medical displays and industrial HMIs. IC Role / Device Role / Timing Role: Push-pull oscillator driving resonant tank with precise dead-time control to avoid transformer saturation. Use Value: 200 mA output current directly drives gate transformers; 45% max duty cycle prevents core reset failure. |
| Battery Charger | AC-DC Adapter |
Use Scenario: Constant-current/constant-voltage charging for 12 V sealed lead-acid or LiFePO₄ batteries. IC Role / Device Role / Timing Role: Voltage-mode controller regulating output with secondary-side feedback via Error Amp 2. Use Value: REF pin supplies stable 5 V to charger management IC; ±1% reference ensures ±1.5% output voltage accuracy. | Use Scenario: Universal-input (90–264 VAC) offline adapter delivering 19 V/3.42 A for laptop power bricks. IC Role / Device Role / Timing Role: Primary-side PWM controller in flyback topology with optocoupler-coupled secondary feedback. Use Value: Dual error amps support both primary regulation and overvoltage protection; SOIC-16 package fits compact PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3844B (ON Semiconductor) | Current-mode control; single error amp; fixed 5 V reference; no dead-time control | Requires external dead-time circuitry for push-pull; less suitable for isolated dual-feedback designs | Select when cost-sensitive, non-isolated buck/boost designs dominate and current sensing is preferred |
| TL494 (Texas Instruments) | Voltage-mode like AZ494; 5 V reference ±2%; no programmable dead-time; higher quiescent current (15 mA) | Lacks DTC pin and dual-error-amp flexibility; requires external components for precise duty-cycle limiting | Select when legacy compatibility or broad distributor availability is prioritized over precision regulation |
Compared with UC3844B and TL494, AZ494CM-E1 offers tighter reference accuracy (±1% vs ±2%), integrated dead-time control eliminating external components, and dual error amplifiers enabling robust isolated converter designs - making it optimal for high-reliability industrial SMPS where regulation precision and layout simplicity matter.
Availability
AZ494CM-E1 is available at Aetrix Electronics and suitable for SMPS power supplies, backlight inverters, and battery chargers requiring stable component supply, RoHS compliance, and long-term industrial lifecycle support.
Supply support for AZ494CM-E1 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
BCD Semiconductor Manufacturing Limited is a Shanghai-based analog and power IC design house specializing in high-voltage, high-efficiency power management solutions for industrial, computing, and consumer markets.
The AZ494 product line delivers voltage-mode PWM controllers optimized for cost-sensitive yet performance-critical switching power supplies - emphasizing reference stability, dual-loop feedback support, and flexible output configuration in compact SOIC/DIP packages.
FAQ
What is the function of the OUTPUT CTRL pin on AZ494CM-E1?
The OUTPUT CTRL pin selects the output configuration: grounding it enables single-ended or parallel operation of C1/E1 and C2/E2 outputs, while connecting it to VREF configures standard push-pull operation. This eliminates need for external logic and ensures safe complementary switching with built-in dead-time control.
Can AZ494CM-E1 be used in isolated flyback converters?
Yes - its dual error amplifiers allow one to monitor primary-side voltage and the other to receive optocoupler feedback from secondary side. Pin 15/16 (2IN+/2IN−) accept isolated error signals, enabling precise regulation without additional error amplifiers or compensation networks.
What is the maximum allowable timing capacitor value for AZ494CM-E1?
The datasheet specifies CT up to 10 µF. Using larger values risks oscillator instability and reduced frequency accuracy due to parasitic leakage and ESR effects. For reliable 1–200 kHz operation, CT should remain within 0.47 nF–10 µF, with typical values near 0.001 µF for 40 kHz designs.
Does AZ494CM-E1 support synchronous rectification?
No - AZ494CM-E1 provides complementary NPN transistor outputs (C1/E1 and C2/E2) intended for driving external MOSFET gates or bipolar power transistors. It lacks dedicated high-side gate drive, adaptive timing, or SR control logic required for synchronous rectification.
AZ494CM-E1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 7V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- 36V
- Current - Output:
- 200mA
- Frequency - Switching:
- 40kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
AZ494CM-E1 FAQ
1.How can I place an order for AZ494CM-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ494CM-E1 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 AZ494CM-E1 reliable?
The price and inventory of AZ494CM-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ494CM-E1 is usually 5 days.
3.What payment methods are accepted for AZ494CM-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ494CM-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ494CM-E1?
AZ494CM-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ494CM-E1 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 AZ494CM-E1?
For technical support, including AZ494CM-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ494CM-E1 requirements.
6.How does Aetrix verify that AZ494CM-E1 is sourced from the original manufacturer or authorized distributors?
All AZ494CM-E1 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 AZ494CM-E1 meets industry standards.
7.What is the process for return or replacement of AZ494CM-E1?
All AZ494CM-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ494CM-E1, 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 AZ494CM-E1 part is unused and in its original packaging.
Return procedure for AZ494CM-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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