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Diodes Incorporated AZ494AP-E1
- Part No.:
- AZ494AP-E1
- Manufacturer:
- Diodes Incorporated
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
AZ494AP-E1.pdf
- Description:
- IC REG BUCK 4.95V 200MA DL 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,343
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Product details
Overview
AZ494AP-E1 from BCD Semiconductor Manufacturing Limited is a voltage-mode PWM controller IC designed for switching power supply regulation, featuring a 4.95V ±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. It operates from 7–36 V supply and supports SMPS, backlight inverters, and battery chargers.
For engineers reviewing the AZ494AP-E1 datasheet, AZ494AP-E1 pinout, AZ494AP-E1 application, or AZ494AP-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 DIP-16 package compatibility with legacy board layouts.
Technical Context
The AZ494AP-E1 implements voltage-mode PWM control using two independent error amplifiers to compare feedback signals against its precision 4.95V reference, enabling tight regulation in step-down, flyback, and forward converters. Its oscillator supports master/slave operation via RT/CT pins, with frequency programmable from 1 kHz to 200 kHz.
Dead-time control prevents shoot-through by limiting maximum duty cycle to 45% when DTC pin is grounded, while the pulse-steering flip-flop ensures non-overlapping drive signals. Output configuration (push-pull vs. single-ended) is selected by applying GND or VREF to the CTRL pin (Pin 13).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 4.95 V ±1% - enables stable 5 V output regulation without external trimming resistors |
| Oscillator Frequency Range | 1–200 kHz - adjustable via RT (1.8–500 kΩ) and CT (0.47 nF–10 µF) for flexible switching speed selection |
| Max Duty Cycle | 45% - enforced by DTC comparator to prevent cross-conduction in half-bridge topologies |
| Output Sink/Source | 200 mA - sufficient to directly drive external NPN/PNP transistor bases or MOSFET gates without buffer stages |
| Supply Voltage Range | 7–36 V - supports wide-input industrial and automotive-grade DC-DC converter designs |
| Error Amplifier Gain | 70–95 dB - provides high loop gain for precise feedback control and improved load/transient response |
| Operating Temperature | −40 to +85 °C - qualified for industrial ambient conditions without derating |
Pinout & Package
AZ494AP-E1 is housed in a 16-pin Dual In-line Package (DIP-16) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch (2.54 mm), compatible with standard PCB footprints and socketing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 15, 16 | IN+ / IN− of Error Amps 1 & 2 | Differential inputs for feedback loops - Pin 1/2 for primary regulation, Pin 15/16 for secondary or overvoltage protection |
| 3 | FEEDBACK | Inverting input of PWM comparator - accepts voltage divider signal for closed-loop duty control |
| 4 | DTC | Dead-Time Control input - sets max duty cycle limit; grounded for 45% hard limit |
| 5, 6 | CT, RT | Oscillator timing terminals - define switching frequency with external RC network |
| 7 | GND | Power and signal reference ground - must be low-impedance connection to minimize noise coupling |
| 8, 9 | C1, E1 | Output 1 collector/emitter - configured as common-emitter or emitter-follower per application |
| 10, 11 | C2, E2 | Output 2 collector/emitter - complementary to C1/E1 for push-pull operation |
| 12 | REF | 4.95 V reference output - supplies bias to feedback dividers or auxiliary circuits |
| 13 | CTRL | Output mode control - GND = single-ended/parallel; VREF = push-pull |
| 14 | VCC | Positive supply input - powers internal circuitry; requires local 0.1 µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Trimmed reference accuracy | ±1% at 4.95 V - eliminates need for external calibration and improves output voltage tolerance across temperature |
| Uncommitted output transistors | 200 mA sink/source per output - allows direct interface to discrete power switches without gate drivers |
| Configurable output topology | Single-ended or push-pull via CTRL pin - simplifies design reuse across buck, boost, and half-bridge topologies |
| Double-pulse suppression | Internal flip-flop logic - guarantees one-shot per clock cycle, preventing unintended switch turn-on during transients |
| On-chip oscillator flexibility | Master/slave mode support - enables synchronized multi-phase operation in high-current supplies |
Applications
| SMPS Power Supply | Backlight Inverter |
|---|---|
Use Scenario: Regulated 5 V/1 A output from 10–40 V DC input in industrial embedded systems. IC Role / Device Role / Timing Role: Primary PWM controller generating variable-duty-cycle gate drive signals for external NPN/PNP transistors in step-down topology. Use Value: 4.95 V ±1% reference ensures ±1.5% output voltage stability over line/load/temperature, reducing post-regulation filtering requirements. | Use Scenario: Driving CCFL lamps in LCD monitors requiring high-voltage AC output (600–1000 VAC) from 12 V DC. IC Role / Device Role / Timing Role: Push-pull controller operating at ~20 kHz to drive center-tapped transformer primary with complementary outputs (C1/E1 and C2/E2). Use Value: 45% max duty cycle enforced by DTC pin prevents transformer saturation and core reset failure during lamp ignition. |
| Battery Charger | DC-DC Converter Module |
Use Scenario: Constant-current/constant-voltage charging of 3S Li-ion packs (12.6 V nominal) from 15–24 V adapter input. IC Role / Device Role / Timing Role: Dual-error-amplifier configuration: EA1 regulates current via sense resistor; EA2 regulates voltage via battery divider. Use Value: Independent amplifier inputs allow simultaneous CC/CV control without external op-amps, minimizing component count and layout area. | Use Scenario: Compact 24 V to 5 V isolated DC-DC module for PoE-powered IoT edge nodes. IC Role / Device Role / Timing Role: Single-ended controller driving MOSFET in flyback topology with optocoupler feedback to Pin 3 (FEEDBACK). Use Value: 200 mA output drive capability eliminates need for external transistor buffers, reducing BOM cost and improving reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3842AN | Current-mode control; single error amp; 2.5 V reference; fixed 52 kHz oscillator | Requires external current-sense resistor; less flexible frequency tuning; no dual-error-amp capability | Select when current-mode control is preferred for inherent cycle-by-cycle current limiting |
| TL494CN | Same voltage-mode architecture; 5 V reference; dual error amps; push-pull output; DIP-16 package | Higher reference (5.0 V); wider max duty cycle (45–95% selectable); lacks DTC pin for hard duty limit | Select when 5.0 V reference is acceptable and adjustable max duty cycle is required for custom topologies |
Compared with UC3842AN and TL494CN, AZ494AP-E1 offers tighter reference accuracy (±1% at 4.95 V), integrated DTC for guaranteed 45% duty cap, and optimized oscillator range (1–200 kHz) - making it preferable for precision industrial SMPS where reference stability and shoot-through prevention are critical.
Availability
AZ494AP-E1 is available at Aetrix Electronics and suitable for SMPS power supplies, backlight inverters, and battery chargers requiring stable component supply, RoHS-compliant lead-free packaging, and long-term industrial lifecycle support.
Supply support for AZ494AP-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 designer specializing in high-reliability, cost-optimized controllers and drivers for power conversion.
AZ494AP-E1 belongs to BCD's legacy PWM controller product line, engineered for robustness in industrial switching supplies where precision reference, dual-error-amplifier flexibility, and discrete-output drive capability are essential.
FAQ
What is the function of the DTC pin (Pin 4) on AZ494AP-E1?
The DTC (Dead-Time Control) pin sets the maximum allowable duty cycle. When grounded, it limits duty cycle to 45% to prevent shoot-through in half-bridge or push-pull configurations. Leaving it open or connecting to VREF disables this limit, allowing full-range PWM control under external supervision.
Can AZ494AP-E1 operate in single-ended mode with only one output active?
Yes. Applying GND to the CTRL pin (Pin 13) configures both outputs (C1/E1 and C2/E2) to operate in parallel single-ended mode. This allows combined 400 mA drive capability or redundancy in critical applications without modifying external circuitry.
How does the AZ494AP-E1 differ from the AZ494CMTR-E1 variant?
AZ494AP-E1 uses a DIP-16 package with through-hole mounting and tube packaging, while AZ494CMTR-E1 is a SOIC-16 surface-mount device supplied in tape-and-reel format. Both share identical electrical specifications and pinout mapping, differing only in mechanical form factor and packaging method.
Is the 4.95 V reference output (Pin 12) internally buffered?
Yes. The REF pin delivers up to 10 mA with ±1% accuracy and includes internal buffering to maintain regulation under load. It can directly power feedback dividers, optocoupler LEDs, or auxiliary circuitry without external followers or decoupling beyond a 0.1 µF capacitor.
AZ494AP-E1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 7V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 4.95V
- Voltage - Output (Max):
- -
- Current - Output:
- 200mA
- Frequency - Switching:
- 40kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-DIP
AZ494AP-E1 FAQ
1.How can I place an order for AZ494AP-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ494AP-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 AZ494AP-E1 reliable?
The price and inventory of AZ494AP-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ494AP-E1 is usually 5 days.
3.What payment methods are accepted for AZ494AP-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ494AP-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ494AP-E1?
AZ494AP-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ494AP-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 AZ494AP-E1?
For technical support, including AZ494AP-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ494AP-E1 requirements.
6.How does Aetrix verify that AZ494AP-E1 is sourced from the original manufacturer or authorized distributors?
All AZ494AP-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 AZ494AP-E1 meets industry standards.
7.What is the process for return or replacement of AZ494AP-E1?
All AZ494AP-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ494AP-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 AZ494AP-E1 part is unused and in its original packaging.
Return procedure for AZ494AP-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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