Boost 6 Click Board™

How Does The Boost 6 Click Board™ Work?

When it comes to the TPS55332-Q1, the monolithic high-voltage switching regulator from Texas Instruments, it is important to state that it operates as a step up (boost) converter.

The feedback concept is voltage mode control using the VSENSE terminal, with cycle-by-cycle current limit. The voltage supervisory function for power-on-rest during system power-on is monitoring the output voltage, and once this has exceeded the threshold set by RST_TH, a delay of 1.0 ms/nF (based on the capacitor value on the Cdly terminal) is invoked before the RST line is released high.

The output is sensed through an external resistor divider and compared with an internal reference voltage. The value of the adjustable output voltage in boost mode is selectable between VIN × 1.05 to 50 V if the minimum ON time (ton) and minimum OFF times are NOT violated by choosing the external resistors. The internal reference voltage Vref has a ±1.5% tolerance. The potentiometer featured on the Boost 6 click can change the feedback thus influencing a change in the output voltage. This makes the click extremely practical because you can, with a simple turn of the potentiometer, get the full voltage range.

Once the internal circuits have stabilized with a minimum input supply of 3.6V, the system can then have an input voltage range from 1.5V to 40V, to maintain a fixed boost output voltage.

Over-current protection is implemented by sensing the current through the NMOS switch FET. The sensed current is then compared to a current reference level representing the over-current threshold limit. If the sensed current exceeds the over-current threshold limit, the over-current indicator is set true. The system ignores the over-current indicator for the leading edge blanking time at the beginning of each cycle to avoid any turn-on noise glitches.

The oscillator frequency is selectable by means of a resistor placed at the RT pin. The switching frequency (ƒsw) can be set in the range of 80 kHz to 2.2 MHz.

The power-on reset output is asserted low until the output voltage exceeds the programmed Vreg_RST voltage threshold and the reset delay timer has expired. Additionally, whenever the Enable pin is low or open, RST is immediately asserted low regardless of the output voltage. There is a reset deglitch timer to prevent a reset being invoked due to short negative transients on the output line.

The TPS55332-Q1 device is designed to operate from an input voltage up to 40 V. Ensure that the input supply is well regulated and it can protect itself from overheating with an internal thermal shutdown circuit. If the junction temperature exceeds the thermal shutdown trip point, the MOSFET is turned off. The device is restarted under control of the slow start circuit automatically when the junction temperature drops below the thermal shutdown hysteresis trip point.

Because the Boost 6 Click Board™ is based on the TPS55332-Q1 device, it is deemed ideal for lighting applications, battery powered and automotive applications.

SPECIFICATIONS

PINOUT DIAGRAM

This table shows how the pinout on the Boost 6 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Reset	RST	1	AN	PWM	16	SYC	Sync
Enable	EN	2	RST	INT	15	NC
	NC	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	NC
	NC	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

ONBOARD SETTINGS AND INDICATORS