UCC3895 Phase-shifted full-bridge controller with enhanced control logic, 0°C to 70°C

Description

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.

Features

Programmable-output turnon delay
Adaptive delay set
Bidirectional oscillator synchronization
Voltage-mode, peak current-mode, or average current-mode control
Programmable soft start, soft stop, and chip disable via a single pin
0% to 100% duty-cycle control
7-MHz error amplifier
Operation to 1 MHz
Typical 5-mA operating current at 500 kHz
Very low 150-µA current during UVLO

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Parametrics

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Part number	Order	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	Order now	Phase-Shifted Full-Bridge	Current Feedforward Voltage	10	16.5	1000	11/9	100	0.1	Adjustable Switching Frequency Current Limiting Error Amplifier Multi-topology Soft Start Soft Switching Synchronization Pin	Catalog	0 to 70	PDIP \| 20 SOIC \| 20 TSSOP \| 20	20PDIP: 229 mm2: 9.4 x 24.33 (PDIP \| 20) 20SOIC: 132 mm2: 10.3 x 12.8 (SOIC \| 20) 20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP \| 20)
LM5046	Order now	Phase-Shifted Full-Bridge	Current Voltage	10	14	1000	Programmable/1.25V	100	1.5 2	Adjustable Switching Frequency Current Limiting Error Amplifier HV Start-up SR Logic Soft Start Soft Switching	Catalog	-40 to 125	HTSSOP \| 28 WQFN \| 28	28HTSSOP: 43 mm2: 4.4 x 9.7 (HTSSOP \| 28) 28WQFN: 25 mm2: 5 x 5 (WQFN \| 28)
UCC2895	Order now	Phase-Shifted Full-Bridge	Current Feedforward Voltage	10	16.5	1000	11/9	100	0.1	Adjustable Switching Frequency Current Limiting Error Amplifier Multi-topology Soft Start Soft Switching Synchronization Pin	Catalog	-40 to 85	PDIP \| 20 SOIC \| 20 TSSOP \| 20	20PDIP: 229 mm2: 9.4 x 24.33 (PDIP \| 20) 20SOIC: 132 mm2: 10.3 x 12.8 (SOIC \| 20) 20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP \| 20)
UCC28950	Order now	Phase-Shifted Full-Bridge	Current Voltage	8	17	1000	7.3/6.75	95	0.2	Adjustable Switching Frequency Current Limiting Error Amplifier Light Load Efficiency Multi-topology SR Logic Soft Start Soft Switching Synchronization Pin	Catalog	-40 to 125	TSSOP \| 24	24TSSOP: 34 mm2: 4.4 x 7.8 (TSSOP \| 24)
UCC28951	Order now	Phase-Shifted Full-Bridge	Current Peak Current Mode Voltage	8	17	1000	7.3/6.7	97	0.2	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	-40 to 125	TSSOP \| 24	24TSSOP: 34 mm2: 4.4 x 7.8 (TSSOP \| 24)

UCC3895 ACTIVE This product has been released to the market and is available for purchase. For some products, newer alternatives may be available. Phase-shifted full-bridge controller with enhanced control logic, 0°C to 70°C

Description

Features

Parametrics

UCC3895
ACTIVE

This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.

Phase-shifted full-bridge controller with enhanced control logic, 0°C to 70°C