UCC3805PW Texas Instruments (SOIC) In Stock
UCC3805PW is a current-mode PWM switching controller by Texas Instruments, operating from a 4 V to 12 V input range with high-speed BiCMOS gate drive in an 8-pin SOIC package. Key specs: current-mode control, up to 1 MHz switching frequency, 1 A peak gate drive. From stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- —
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- UCC3805PW Datasheet PDF
- Price
- From $1.6251(MOQ 100)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Current-mode PWM control with cycle-by-cycle current limiting provides inherent over-current protection and simplified compensation in flyback and forward converter designs
- 4 V to 12 V input voltage range suits auxiliary supply rails in off-line power supplies and telecom rectifiers without additional biasing
- High-speed BiCMOS output driver with 1 A peak current capability drives external power MOSFETs up to 1 MHz switching frequency
- 8-pin SOIC package enables high-density placement in compact switch-mode power supply modules with minimal PCB area
Applications
The UCC3805PW is a primary-side PWM controller for isolated flyback, forward, and SEPIC converters in industrial power supplies, telecom equipment, and server auxiliary rails. Its current-mode topology with cycle-by-cycle limiting simplifies output-voltage regulation loop compensation and adds intrinsic protection against transformer saturation. The 1 A gate drive capability allows it to directly drive TO-220 and D2PAK power MOSFETs at switching frequencies up to 1 MHz without an external buffer stage.
Specifications
| YTEOL | 0 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 12V |
| Input Voltage-Min | 4V |
| Input Voltage-Nom | 10V |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 1A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 25mA |
| Supply Voltage-Max (Vsup) | 12V |
| Supply Voltage-Nom (Vsup) | 10V |
| Surface Mount | YES |
| Switcher Configuration | BUCK-BOOST |
| Switching Frequency-Max | 1000kHz |
| Technology | BICMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 2 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for UCC3805PW:
Switching Controller, Current-mode, 1A, 1000kHz Switching Freq-Max, BICMOS, PDSO8
Frequently Asked Questions
What input voltage range does the UCC3805PW support, and which power supply topologies is it optimized for?
The UCC3805PW accepts a bias supply from 4 V to 12 V (nominal 10 V), making it suitable for auxiliary winding bias in off-line flyback converters and forward converter designs where the bias rail is derived from a secondary winding. It is optimized for isolated flyback, forward, and SEPIC topologies operating at switching frequencies from 100 kHz up to 1 MHz.
How does current-mode control in the UCC3805PW simplify the error amplifier compensation design compared with voltage-mode control?
In a current-mode controlled converter like those using the UCC3805PW, the inner current loop forces the inductor current to track the error amplifier output on a cycle-by-cycle basis, converting the power stage from a second-order to a first-order system above half the switching frequency. This means the error amplifier only needs a single-pole compensation network (one resistor and one capacitor of approximately 10 kΩ and 10 nF for a typical 100 W flyback) instead of the two-pole two-zero network required for voltage-mode control, reducing design time and component count by roughly 4 passives per rail.
For a 100 W isolated flyback converter at 200 kHz, what gate drive current does the UCC3805PW provide and how does that affect external MOSFET selection?
The UCC3805PW delivers up to 1 A peak source and sink gate drive current. At 200 kHz switching frequency with a total gate charge of 50 nC (typical for a 600 V, 10 A TO-220 MOSFET), this 1 A drive current achieves a rise time of approximately 50 ns and eliminates the need for a discrete gate buffer stage, simplifying the BOM by 2 to 3 components and keeping switching losses below 2 W at full load.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 100+ | $26.4600 | $2646.00 |
| 133+ | $2.2600 | $300.58 |
| 600+ | $1.6251 | $975.04 |
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