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UC2525AJ
Texas Instruments
REGULATING PULSE WIDTH MODULATOR
1525 Pcs New Original In Stock
Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull Regulator Positive Output Step-Up, Step-Down, Step-Up/Step-Down DC-DC Controller IC 16-CDIP
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Minimum 1
5.0 / 5.0
- (39 Ratings)
UC2525AJ
Product Overview
11238056
DiGi Electronics Part Number
UC2525AJ-DGManufacturer
Texas Instruments
UC2525AJ
Description
REGULATING PULSE WIDTH MODULATORInventory
1525 Pcs New Original In Stock
Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull Regulator Positive Output Step-Up, Step-Down, Step-Up/Step-Down DC-DC Controller IC 16-CDIP
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
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UC2525AJ Technical Specifications
Category
Power Management (PMIC), DC DC Switching Controllers
Packaging
-
Series
-
Product Status
Active
Output Type
Transistor Driver
Function
Step-Up, Step-Down, Step-Up/Step-Down
Output Configuration
Positive
Topology
Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull
Number of Outputs
2
Output Phases
1
Voltage - Supply (Vcc/Vdd)
8V ~ 35V
Frequency - Switching
100Hz ~ 500kHz
Duty Cycle (Max)
49%
Synchronous Rectifier
Yes
Clock Sync
Yes
Serial Interfaces
-
Control Features
Dead Time Control, Frequency Control, Ramp, Soft Start
Operating Temperature
-25°C ~ 85°C (TA)
Mounting Type
Through Hole
Package / Case
16-CDIP (0.300", 7.62mm)
Supplier Device Package
16-CDIP
Datasheet & Documents
HTML Datasheet
UC2525AJ-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
Not Applicable
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-UC2525AJ
Standard Package
1
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
애프터 서비스가 만족스러워서 다른 고객들에게도 추천하고 싶어요.
Dec 02, 2025
구매 후 사후 서비스가 뛰어나서 다시 구매하고 싶어졌어요. 문제가 생겨도 신속하게 대응해주시고, 친절한 설명 덕분에 안심하고 이용할 수 있었습니다.
Dec 02, 2025
Die Beratung und der Support nach dem Kauf bei DiGi Electronics sind hervorragend.
Dec 02, 2025
Efficient dispatch and secure packaging made the entire process smooth.
Dec 02, 2025
Their support team provides detailed technical assistance promptly after purchase.
Dec 02, 2025
The value I receive from DiGi Electronics' products exceeds their price point.
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Frequently Asked Questions (FAQ)
What are the key design risks when using the UC2525AJ in a high-frequency push-pull converter above 300 kHz, and how can I mitigate shoot-through or duty cycle instability?
The UC2525AJ is capable of operating up to 500 kHz, but above 300 kHz, parasitic inductance in the 16-CDIP package and PCB layout can cause duty cycle jitter and unintended shoot-through in push-pull topologies due to delayed gate drive transitions. To mitigate this, ensure tight Kelvin connections to the timing capacitor (CT) and resistor (RT), use a low-inductance ground plane, and add small gate resistors (10–47 Ω) in series with each output to dampen ringing. Additionally, verify dead time control is properly tuned—insufficient dead time at high frequencies increases cross-conduction risk, especially with fast-switching MOSFETs. Always validate switching waveforms with an oscilloscope under full load.
Can I replace the UC2525AJ with the more modern UC3825ADW in a legacy flyback design without redesigning the feedback loop or compensation network?
While the UC3825ADW from Texas Instruments is a functional upgrade with improved propagation delay and higher drive current, direct replacement of the UC2525AJ in a flyback design is not always drop-in compatible. The UC3825ADW has a different error amplifier gain-bandwidth product and slightly altered ramp characteristics, which may destabilize existing Type II or Type III compensation networks. Additionally, the UC3825ADW’s faster output rise/fall times can exacerbate EMI in tightly coupled transformers. We recommend re-evaluating loop stability via Bode plot analysis and possibly adjusting compensation components. If board space allows, retain the UC2525AJ for legacy consistency unless performance gains justify requalification.
How does the UC2525AJ’s lack of integrated soft-start capacitor affect startup behavior in a 24V-to-48V boost converter under light load, and what external circuitry is needed to prevent overshoot?
The UC2525AJ requires an external capacitor on the SS (soft-start) pin to control ramp-up time, and without it, the duty cycle can jump abruptly at startup—especially problematic in boost converters where output voltage overshoot can exceed 20% under light loads. To prevent this, connect a 100 nF to 1 µF ceramic capacitor from SS to ground, sized based on desired startup time (t ≈ 1.5 × C_SS × V_REF / I_SS, where I_SS ≈ 100 µA). For tighter control, add a small resistor (10–100 kΩ) in series with the capacitor to limit inrush current into the error amplifier. Always test startup into worst-case load conditions to ensure output stays within safe margins for downstream components.
Is the UC2525AJ suitable for automotive 12V battery systems with load dump transients up to 40V, given its 35V Vcc max rating, and what protection circuitry is essential?
The UC2525AJ’s maximum Vcc of 35V makes it borderline for automotive applications where load dump events can exceed 40V for hundreds of milliseconds. Direct connection to the vehicle battery without protection risks permanent damage. To safely use the UC2525AJ, implement a front-end protection circuit including a 36V TVS diode (e.g., SMAJ33A) followed by a series current-limiting resistor (10–22 Ω, 1W) and a low-ESR bulk capacitor. Alternatively, use a preregulator such as the LM2940 LDO or a buck pre-regulator to clamp input voltage below 30V. This ensures reliable operation across the full -25°C to 85°C range while meeting ISO 7637-2 surge requirements.
When paralleling two UC2525AJ controllers for higher current output in a half-bridge configuration, what synchronization and current-sharing challenges arise, and how can they be resolved?
Paralleling UC2525AJ devices in a half-bridge setup introduces risks of beat-frequency oscillations and uneven current sharing due to slight mismatches in oscillator frequency and propagation delay, even with clock sync enabled. The internal oscillators may drift apart over temperature, causing one side to dominate conduction. To resolve this, hard-sync both devices to a common external clock source using the SYNC pin, and add 1–5% ballast resistance (e.g., 0.1–0.5 Ω) in series with each high-side and low-side switch to enforce current sharing. Additionally, use matched gate drive transformers and ensure symmetrical PCB layout to minimize timing skew. Monitor thermal imbalance during burn-in testing—uneven heating indicates poor current distribution requiring layout or component adjustments.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
UC2525AJ CAD Models
Texas Instruments UC2525AJ PCB symbols & footprints
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