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STMicroelectronics E-UC2844BD1013TR
- Part No.:
- E-UC2844BD1013TR
- Manufacturer:
- STMicroelectronics
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
E-UC2844BD1013TR.pdf
- Description:
- IC REG CTRLR BST FLYBK ISO 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,011
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Product details
Overview
E-UC2844BD1013TR from STMicroelectronics is a high-performance current-mode PWM controller IC designed for fixed-frequency off-line and DC-DC power supplies. It features a trimmed oscillator (250 kHz guaranteed), 0–50% maximum duty cycle due to internal toggle flip-flop, under-voltage lockout (16 V on / 10 V off), and a totem-pole output capable of ±1 A peak drive - used to control N-channel MOSFETs in flyback or forward converters.
For engineers reviewing the E-UC2844BD1013TR datasheet, E-UC2844BD1013TR pinout, E-UC2844BD1013TR application, or E-UC2844BD1013TR equivalent, key selection criteria include UVLO threshold compatibility, <50% duty-cycle constraint, current-sense gain (3.0 V/V), 5.0 V reference accuracy (±50 mV), and SO8 thermal performance (Rth j-amb = 150 °C/W).
Technical Context
The E-UC2844BD1013TR implements current-mode control with automatic feed-forward compensation and latching PWM for cycle-by-cycle current limiting. Its error amplifier provides 90 dB open-loop gain and 1 MHz unity-gain bandwidth, enabling stable loop compensation in isolated topologies.
Oscillator frequency is set via external RT/CT network (e.g., RT = 6.2 kΩ, CT = 1 nF yields 250 kHz), with discharge current tightly trimmed (7.5–8.8 mA) and temperature-stable frequency variation (<±1%). The internal toggle flip-flop enforces ≤50% duty cycle by blanking every other clock cycle - distinguishing it from UC2842B/3B variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | Guaranteed 250 kHz at 25°C; supports up to 500 kHz with external component tuning. |
| Max Duty Cycle | 47–50% - enforced by internal toggle flip-flop; prevents transformer saturation in forward/flyback designs. |
| UVLO Threshold | 16 V turn-on / 10 V turn-off - optimized for universal AC input offline adapters with bulk capacitor startup. |
| Current Sense Gain | 3.0 V/V (±5%) - converts sense resistor voltage to precise 1 V trip point for accurate peak-current limiting. |
| Reference Voltage | 5.00 V ±50 mV (0–70°C); supplies 1 mA typical charging current for CT via RT - enables stable oscillator timing. |
| Output Drive | ±1 A peak sink/source - directly drives gate capacitance of medium-power N-MOSFETs without buffer stage. |
| Start-up Current | <0.5 mA at 6.5 V - minimizes auxiliary winding losses during initial power-up in flyback converters. |
Pinout & Package
Package: SO8 (Small Outline Integrated Circuit, 150 °C/W junction-to-ambient thermal resistance). Pin numbering follows standard SO8 top-view layout with 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - COMP | Error amplifier output | Provides access to EA output for Type II/III compensation networks; high-impedance node requiring low-leakage capacitor. |
| 2 - VFB | Inverting input of error amplifier | Connected to feedback divider from output; sets regulation point via 2.5 V internal reference comparator. |
| 3 - ISENSE | Current sense input | Accepts voltage from primary-side sense resistor; triggers PWM latch at 1 V threshold (gain × sensed voltage). |
| 4 - RT/CT | Oscillator timing interface | RT connects to VREF (pin 8) and CT to GND (pin 5); sets fOSC and max duty cycle via RC time constant. |
| 5 - GROUND | Signal and power return | Single-point ground for control circuitry and power stage; critical for noise immunity in current-mode operation. |
| 6 - OUTPUT | Gate driver output | Totem-pole stage sinks or sources up to 1 A; low-state voltage ≤0.4 V at 20 mA ensures MOSFET turn-off robustness. |
| 7 - VCC | Supply input | Operates from 10–30 V; internal zener clamp at 36 V protects against transient overvoltage on startup winding. |
| 8 - VREF | 5 V reference output | Stable 5.0 V source with ±50 mV tolerance; supplies bias for RT and supports external circuitry with ≤20 mA load. |
Key Features
| Feature | Design Value |
|---|---|
| Latched PWM with cycle-by-cycle current limit | Prevents secondary failure during overload or short-circuit by disabling output until next clock cycle reset. |
| Internally trimmed 5 V reference | ±50 mV accuracy over temperature eliminates need for external trimming in cost-sensitive SMPS designs. |
| Automatic feed-forward compensation | Compensates for line-voltage variations in real time without additional sensing circuitry or op-amps. |
| Low start-up current (<0.5 mA) | Reduces dissipation in high-impedance startup resistors, enabling smaller, cooler auxiliary supply networks. |
| High-current totem-pole output | Drives 1 nF gate capacitance with <150 ns rise/fall times - sufficient for MOSFETs up to ~200 W output. |
Applications
| AC-DC Adapter | Flyback Power Supply |
|---|---|
|
Use Scenario: Universal-input (85–265 VAC) 12 V/2 A wall adapter for consumer electronics. IC Role / Device Role / Timing Role: Primary-side PWM controller regulating output via optocoupler feedback; generates 250 kHz switching signal with 48% max duty cycle. Use Value: Internal UVLO (16 V on) ensures reliable startup from bulk capacitor; 50% duty cap avoids core reset issues in discontinuous conduction mode. |
Use Scenario: Isolated 5 V/3 A flyback converter in industrial IoT gateway power stage. IC Role / Device Role / Timing Role: Current-mode controller implementing primary-side sensing and opto-isolated voltage feedback; operates at 250 kHz with slope compensation. Use Value: 3.0 V/V current sense gain enables precise 0.2 Ω sense resistor use; ±1 A output drives 650 V MOSFET gate with minimal external components. |
| Offline LED Driver | DC-DC Forward Converter |
|
Use Scenario: Constant-current 36 V/350 mA LED driver for commercial lighting with TRIAC dimming compatibility. IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller regulating LED string current via secondary-side shunt feedback; uses leading-edge blanking on ISENSE. Use Value: Latching overcurrent protection shuts down during dimmer phase-cut transients; 250 kHz switching enables compact magnetics and low EMI. |
Use Scenario: 48 V input to 12 V/10 A forward converter in telecom power shelf. IC Role / Device Role / Timing Role: Primary-side PWM controller with synchronous rectification enable signal; manages reset winding timing and duty cycle clamping. Use Value: Toggle flip-flop limits duty to 48%, preventing transformer saturation during wide input range (36–75 V); VREF powers auxiliary bias rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-mode PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3844BD1 | Same pinout and electrical specs; rated for 0–70°C ambient (vs. –40 to 105°C for UC2844B) | Not qualified for extended temperature industrial or automotive environments | Select when operating ambient stays below 70°C and cost is prioritized over extended temp rating |
| NCP1200DR2G | Fixed 65 kHz frequency; no adjustable RT/CT; integrated soft-start; lower start-up current (100 µA) | Lacks programmable frequency and duty cycle; suited for low-cost, low-power adapters only | Choose for <15 W applications where simplicity and ultra-low standby power outweigh flexibility |
Compared with UC3844BD1, E-UC2844BD1013TR offers wider temperature qualification and identical SO8 footprint; versus NCP1200DR2G, it delivers full programmability and higher output drive but requires more external components and lacks integrated soft-start.
Availability
E-UC2844BD1013TR is available at Aetrix Electronics and suitable for AC-DC adapters, flyback power supplies, offline LED drivers, and DC-DC forward converters requiring stable component supply, long-term lifecycle support, and SO8-compatible reflow assembly.
Supply support for E-UC2844BD1013TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
E-UC2844BD1013TR belongs to the UCx84xB family of current-mode PWM controllers - engineered specifically for cost-effective, high-reliability off-line and isolated DC-DC power conversion with minimal external components.
FAQ
What is the maximum recommended oscillator frequency for E-UC2844BD1013TR?
The device supports oscillator frequencies up to 500 kHz per datasheet specifications, achieved using small CT values (e.g., 100 pF) and low RT (e.g., 10 kΩ). At 500 kHz, propagation delays and gate drive capability remain within specification, but PCB layout must minimize parasitic inductance on RT/CT and GND paths to maintain stability.
Does E-UC2844BD1013TR require external slope compensation in continuous conduction mode (CCM)?
Yes - slope compensation is required for stable CCM operation in boost, flyback, or forward converters. The internal current-sense comparator lacks built-in ramp injection; designers must add a sawtooth voltage (typically derived from RT/CT node) summed into the ISENSE pin via a resistor network to prevent subharmonic oscillation above 50% duty cycle.
Can E-UC2844BD1013TR drive a P-channel MOSFET directly?
No - the OUTPUT pin is a totem-pole stage referenced to GND (pin 5), sinking current when low and sourcing when high. It cannot directly drive a high-side P-MOSFET gate, which requires a negative gate-source voltage relative to source. An external level-shifting circuit or dedicated high-side driver is required for P-MOSFET use.
How does the UVLO hysteresis affect system reliability in offline applications?
The 6 V hysteresis (16 V on / 10 V off) prevents chattering during brown-out conditions near the turn-off threshold. In offline flyback designs, this ensures clean restart after AC dropout and avoids repeated stress on the MOSFET and transformer caused by unstable cycling near the minimum bulk capacitor voltage.
E-UC2844BD1013TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Boost, Flyback
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 10V ~ 30V
- Frequency - Switching:
- Up to 500kHz
- Duty Cycle (Max):
- 48%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Frequency Control
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
E-UC2844BD1013TR FAQ
1.How can I place an order for E-UC2844BD1013TR through Aetrix?
Please submit a Request for Quotation (RFQ) for E-UC2844BD1013TR 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 E-UC2844BD1013TR reliable?
The price and inventory of E-UC2844BD1013TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-UC2844BD1013TR is usually 5 days.
3.What payment methods are accepted for E-UC2844BD1013TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-UC2844BD1013TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for E-UC2844BD1013TR?
E-UC2844BD1013TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your E-UC2844BD1013TR 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 E-UC2844BD1013TR?
For technical support, including E-UC2844BD1013TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-UC2844BD1013TR requirements.
6.How does Aetrix verify that E-UC2844BD1013TR is sourced from the original manufacturer or authorized distributors?
All E-UC2844BD1013TR 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 E-UC2844BD1013TR meets industry standards.
7.What is the process for return or replacement of E-UC2844BD1013TR?
All E-UC2844BD1013TR units undergo pre-shipment inspection (PSI). If there is an issue with E-UC2844BD1013TR, 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 E-UC2844BD1013TR part is unused and in its original packaging.
Return procedure for E-UC2844BD1013TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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