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UCC2809DTR-1
Texas Instruments
IC OFFLINE SWITCH MULT TOP 8SOIC
5448 Pcs New Original In Stock
Converter Offline Boost, Flyback, Forward Topology 1MHz 8-SOIC
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5.0 / 5.0
- (448 Ratings)
UCC2809DTR-1
Product Overview
1849127
DiGi Electronics Part Number
UCC2809DTR-1-DGManufacturer
Texas Instruments
UCC2809DTR-1
Description
IC OFFLINE SWITCH MULT TOP 8SOICInventory
5448 Pcs New Original In Stock
Converter Offline Boost, Flyback, Forward Topology 1MHz 8-SOIC
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
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UCC2809DTR-1 Technical Specifications
Category
Power Management (PMIC), AC DC Converters, Offline Switches
Packaging
Tape & Reel (TR)
Series
-
Product Status
Active
Output Isolation
Isolated
Internal Switch(s)
No
Voltage - Breakdown
-
Topology
Boost, Flyback, Forward
Voltage - Start Up
10 V
Voltage - Supply (Vcc/Vdd)
8V ~ 19V
Duty Cycle
70%
Frequency - Switching
1MHz
Fault Protection
-
Control Features
Frequency Control, Soft Start
Operating Temperature
-55°C ~ 150°C (TJ)
Package / Case
8-SOIC (0.154", 3.90mm Width)
Supplier Device Package
8-SOIC
Mounting Type
Surface Mount
Base Product Number
UCC2809
Datasheet & Documents
Manufacturer Product Page
UCC2809DTR-1 Specifications
HTML Datasheet
UCC2809DTR-1-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
UCC2809DTR-1-DG
296-39533-6
296-39533-2
296-39533-1
Standard Package
2,500
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
грудня 02, 2025
가격이 저렴해서 자주 들러요. 직원들이 매우 친절하고 도움도 많이 주셔서 감사해요.
грудня 02, 2025
I feel confident purchasing from DiGi Electronics due to their excellent support.
грудня 02, 2025
I find DiGi Electronics' products to be of exceptional quality.
грудня 02, 2025
Even with budget-friendly prices, their packaging quality is never compromised.
грудня 02, 2025
Their inventory oversight ensures products are always available when needed.
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Frequently Asked Questions (FAQ)
What are the key design risks when using the UCC2809DTR-1 in a high-density offline flyback converter, and how can I mitigate thermal and layout-related failures?
The UCC2809DTR-1 operates at up to 1MHz switching frequency, which increases power dissipation in the controller and surrounding components due to higher gate drive losses and parasitic ringing. In high-density designs, poor thermal management and inadequate PCB layout can lead to localized heating, reduced efficiency, and premature failure. To mitigate this, ensure a solid ground plane under the 8-SOIC package, use thermal vias to dissipate heat from the exposed pad (if present), and keep high-di/dt loops (e.g., primary switch, transformer, input capacitor) as short as possible. Place the VCC bypass capacitor within 5mm of the IC to minimize noise coupling. Also, derate the operating temperature margin—avoid sustained operation near 125°C junction temperature unless validated with thermal imaging.
Can I replace the UCC2809DTR-1 with the ON Semiconductor NCP1200P100 in an existing offline boost design without major circuit changes?
Direct replacement of the UCC2809DTR-1 with the NCP1200P100 is not recommended due to fundamental architectural differences. The UCC2809DTR-1 is a current-mode controller with soft-start and frequency control optimized for boost, flyback, and forward topologies, while the NCP1200P100 is a fixed-frequency (100kHz), voltage-mode controller primarily intended for flyback applications. The UCC2809DTR-1’s 1MHz operation allows smaller magnetics but requires tighter compensation and layout; the NCP1200P100 runs cooler at lower frequencies but may need larger transformers and output filters. Additionally, the NCP1200 lacks the same level of soft-start control, which could increase inrush current stress. A redesign of the feedback loop, transformer, and input/output filtering would be necessary for reliable operation.
How does the 70% maximum duty cycle of the UCC2809DTR-1 impact transformer design in a wide-input-range offline flyback converter?
The 70% duty cycle limit of the UCC2809DTR-1 constrains the maximum energy transfer per cycle, especially at low line voltages (e.g., 85VAC input). This requires careful transformer turns ratio selection to ensure sufficient volt-second balance and avoid core saturation during startup or load transients. For wide-input-range designs (85–265VAC), you may need to increase the primary inductance or reduce the turns ratio to maintain regulation at high line, but this trades off peak current stress and efficiency at low line. Always simulate or prototype the worst-case low-line, full-load condition to verify that the reflected output voltage plus margin stays below the maximum allowable primary voltage. Consider using a valley-fill or active clamp circuit if tighter regulation is needed across the full input range.
Is the UCC2809DTR-1 suitable for safety-critical medical or industrial power supplies requiring reinforced isolation, and what external components are essential for compliance?
The UCC2809DTR-1 itself does not provide internal isolation—it is a controller only—so suitability for medical or industrial applications depends entirely on the external transformer and optocoupler feedback design. For reinforced isolation (e.g., IEC 60601-1 or IEC 61010), you must use a transformer rated for double or reinforced insulation with appropriate creepage and clearance (≥8mm for 250VAC working voltage). Pair the UCC2809DTR-1 with a high-reliability optocoupler (e.g., Toshiba TLP785 or Broadcom ACPL-M71T) and ensure the feedback loop meets isolation voltage and transient immunity requirements. Additionally, include Y-capacitors and common-mode chokes for EMI compliance, and validate the entire system through Hi-Pot testing (e.g., 4kVAC for 60 seconds) to ensure long-term reliability under fault conditions.
What are the reliability implications of operating the UCC2809DTR-1 at its maximum 150°C junction temperature in an enclosed industrial power supply?
Operating the UCC2809DTR-1 continuously near its 150°C Tj(max) significantly reduces long-term reliability due to accelerated electromigration, bond wire fatigue, and potential degradation of the internal gate driver. Even though the datasheet allows this limit, real-world field data suggests that every 10°C above 100°C roughly halves the expected lifetime. In enclosed industrial environments with poor airflow, thermal runaway risk increases if ambient temperatures exceed 70°C. To improve MTBF, design for a maximum junction temperature of 110–125°C under worst-case conditions. Use a heatsink or copper pour on the PCB, monitor case temperature with a thermistor, and consider derating the output power by 10–15% in high-ambient applications. Also, ensure the VCC supply remains stable above 10V during startup to avoid latch-up or erratic behavior under thermal stress.
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UCC2809DTR-1 CAD Models
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