The UCC3895 is a phase-shift PWM controller that implements control of a full-bridge power stage by phase shifting the switching of one half-bridge with respect to the other. The device allows constant frequency pulse-width modulation in conjunction with resonant zero-voltage switching to provide high efficiency at high frequencies. The part is used either as a voltage-mode or current-mode controller.
While the UCC3895 maintains the functionality of the UC3875/6/7/8 family and UC3879, it improves on that controller family with additional features such as enhanced control logic, adaptive delay set, and shutdown capability. Because the device is built using the BCDMOS process, it operates with dramatically less supply current than it’s bipolar counterparts. The UCC3895 operates with a maximum clock frequency of 1 MHz.
Topology |
Control method |
VCC (Min) (V) |
VCC (Max) (V) |
Frequency (Max) (kHz) |
UVLO thresholds on/off (V) |
Duty cycle (Max) (%) |
Gate drive (Typ) (A) |
Features |
Rating |
Operating temperature range (C) |
Package Group |
Package size: mm2:W x L (PKG) |
UCC3895 | LM5046 | UCC2895 | UCC28950 | UCC28951 |
---|---|---|---|---|
Phase-Shifted Full-Bridge | Phase-Shifted Full-Bridge | Phase-Shifted Full-Bridge | Phase-Shifted Full-Bridge | Phase-Shifted Full-Bridge |
Current Feedforward Voltage |
Current Voltage |
Current Feedforward Voltage |
Current Voltage |
Current Peak Current Mode Voltage |
10 | 10 | 10 | 8 | 8 |
16.5 | 14 | 16.5 | 17 | 17 |
1000 | 2000 | 1000 | 1000 | 1000 |
11/9 | Programmable/1.25V | 11/9 | 7.3/6.75 | 7.3/6.7 |
100 | 100 | 100 | 95 | 97 |
0.1 |
1.5 2 |
0.1 | 0.2 | 0.2 |
Adjustable Switching Frequency Current Limiting Error Amplifier Multi-topology Soft Start Soft Switching Synchronization Pin |
Adjustable Switching Frequency Current Limiting Error Amplifier HV Start-up SR Logic Soft Start Soft Switching |
Adjustable Switching Frequency Current Limiting Error Amplifier Multi-topology Soft Start Soft Switching Synchronization Pin |
Adjustable Switching Frequency Current Limiting Error Amplifier Light Load Efficiency Multi-topology SR Logic Soft Start Soft Switching Synchronization Pin |
Adjustable Switching Frequency Current Limiting Enable/Shutdown Error Amplifier Green Mode Light Load Efficiency Programmable Slope Compensation Soft Start Soft Switching Synchronization Pin Thermal Shutdown |
Catalog | Catalog | Catalog | Catalog | Catalog |
0 to 70 | -40 to 125 | -40 to 85 | -40 to 125 | -40 to 125 |
PDIP | 20
SOIC | 20 TSSOP | 20 |
HTSSOP | 28
WQFN | 28 |
PDIP | 20
SOIC | 20 TSSOP | 20 |
TSSOP | 24 | TSSOP | 24 |
See datasheet (PDIP) 20SOIC: 132 mm2: 10.3 x 12.8 (SOIC | 20) 20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20) |
28HTSSOP: 43 mm2: 4.4 x 9.7 (HTSSOP | 28)
28WQFN: 25 mm2: 5 x 5 (WQFN | 28) |
See datasheet (PDIP) 20SOIC: 132 mm2: 10.3 x 12.8 (SOIC | 20) 20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20) |
24TSSOP: 34 mm2: 4.4 x 7.8 (TSSOP | 24) | 24TSSOP: 34 mm2: 4.4 x 7.8 (TSSOP | 24) |
Order now | Order now | Order now | Order now | Order now |