THV3056 Datasheet, PDF (25/32 Pages) THine Electronics, Inc. – 3ch Buck/Boost 2ch CP 1ch HVLDO 1ch LVLDO Controller

THV3056_Rev.2.00_E
● Thermal Shut Down(TSD)
TSD detects abnormal heat and reports it to SCP circuit. The detecting temperature is 175°C, release temperature is
160°C.
● Current Limit Circuit(LDO)
High voltage LDO and Low voltage LDO( of 3.3V output) have built-in auto-recovery current limit function. The thresh-
old current is 250mA for High voltage LDO, 700mA for Low voltage LDO.
● Voltage Reference Circuit
Voltage reference circuit generates temperature-compensated voltage(=1.2V) for the use as the internal reference
voltage. Also, an external load current can be obtained from the power supply at VREF pin, up to 1mA maximum.
Please connect a capacitor of 0.01uF between VREF pin and SGND for stability.
● Error Amplifier
Error Amplifier detects the output voltage of switching regulator and outputs the PWM control signal. Programmable
by connecting feedback resistor and capacitor between the output of Error Amp(FB_1/2/3) and Inverting
input(INV_1,2), it can provide stable phase compensation.
● Oscillation Circuit
The oscillation frequency can be defined by the external resistor connected between RT pin and GND. (See Typical
Characteristics “the graph of oscillation frequency vs RT resistance”.)
The relation between the oscillation frequency and the resistance of RT is approximately as follows.
2.35 x 10⁴
Oscillation Frequency （kHz） ≒
RT(kΩ)
● VREG5, VREG5IN
Built-in 5V local regulator for power supply of ch-1 and ch-2 output and for internal power supply. If the input volt-
age is lower than 5.5V, short-circuit the input voltage and VREG5 pin. If the input voltage is higher than 5.5V, leave
the input voltage and VREG5 pin open.
● Amplifier for Vcom
A buffer amplifier attained 4V/us slew rate. If output current is required, use the external bipolar transistor.
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