Carrier Board for Advanced Phase-Shift PWM Controller UCC3895

Rajkumar Sharma
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SKU: EL117625
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This is a Phase-Shifted Full-Bridge PWM UCC3895 carrier board that contains all of the features necessary to implement a phase-shifted full-bridge topology power converter. All inputs and outputs pins are accessible using a header connector. A highly-efficient DC-DC converter can be created using this carrier board + External H-Bridge and Transformer. Refer to the datasheet of UC3895 and schematic to configure the working frequency, current feedback, delays, etc.

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 its bipolar counterparts. The UCC3895 operates with a maximum clock frequency of 1 MHz.

Note: This is a carrier board for UCC3895 phase-shift chip, refer to the datasheet of UCC3895 IC to learn more about setting up the delay, current sense, duty cycle, frequency.

Features

Operating Power-Supply 10V to 16.5V DC
Default Frequency 195Khz
Programmable-output turn-on 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 up to 1 MHz
Typical 5-mA operating current at 500 kHz
Very low 150-μA current during UVLO
PCB dimensions: 24.40 x 26.04 mm

Connector CN1 Pinout

Pin 1 VDD 10V to 16.5V DC
Pin 2 VREF Output 5V DC
Pin 3 Error Amplifier (EA)
Pin 4 Output A
Pin 5 Output B
Pin 6 Output C
Pin 7 Output D
Pin 8 Current Sense In
Pin 9 GND
Pin 10 Not Connected ( NC)

Schematic

Application Diagram

Parts List

NO.	QNTY.	REF.	DESC.	MANUFACTURER	SUPPLIER	PART NO
1	1	CN1	10 PIN MALE HEADER RIGHT ANGLE PITCH 2.54MM	WURTH	DIGIKEY	732-2670-ND
2	1	C1	0.022uF/50V SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
3	2	C2,C8	1KPF/50V SIZE 0805	MURATA/YAGEO	DIGIKEY
4	1	C3	1uF/50V SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
5	1	C4	56PF/50V SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
6	1	C5	10uF/25V SMD SIZE 1206	MURATA/YAGEO	DIGIKEY
7	1	C6	330PF/50V SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
8	1	C7	0.1uF/50V SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
9	1	D1	1N4148	MICROCHIP TECH	MOUSER	494-1N4148UR-1
10	1	PR1	50K TRIMMER POT	BOURNS	MOUSER	3362H-503LF-ND
11	1	Q1	BC847AL	NEXPERIA	DIGIKEY	BC847B-TPCT-ND
12	1	R1	8.8K 1% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
13	1	R2	510E 1% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
14	1	R3	10K 1% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
15	1	R4	21K 1% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
16	1	R5	2K 1% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
17	1	R6	68K 1% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
18	1	R7	560E 1% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
19	1	R8	2.4K 1% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
20	2	R9,R10	10E 5% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
21	1	R11	DNP
22	1	U1	UCC3895	TI	DIGIKEY	296-2552-5-ND