THV3058 Datasheet, PDF (13/21 Pages) THine Electronics, Inc. – 3CH (Buck/Boost) 2CH CP 1CH HVLDO Controller

THV3058_Rev.1.00_E
● Soft Start
To prevent excessive rise of output voltage during start-up. THV3058 have soft start circuits within CH-1, CH-2, CH-3
and load switch circuit. The output voltages of these internal soft start circuits rise according to each internal start-up
sequences, and then make the output of DC/DC converter and the output after load switch rise up. Soft start operation is
completed when these outputs have reached each regular voltages.
Soft start time of CH-2 is 7msec and CH-1, CH-3 and load switch are set to 10msec (See Figure 4).
● Start-up Sequence
Figure 4 shows the waveform of start-up sequence. CH-1 and CH-3 are operate after CH-2 is generated completely. VGL
starts after the start-up of CH-1 is completed. VGH starts with 5msec delay, after VLS signal is generated.
7msec 10msec
VO1
10msec 5msec
VO2
VO3=3.3V
VGH
VLS
HVLDO
VGH_OK
VGL
Figure 4. Start-up Sequence Waveforms
● Thermal Shut Down(TSD)
THV3058 has the built-in Thermal Shut Down circuit to prevent damages caused by excessive heat. When the junction
temperature reaches 175°C, TSD circuit stops switching operation and the regulator VREG5 operation. The release tem-
perature is 160°C.
● Voltage Reference Circuit
Voltage reference circuit generates temperature-compensated voltage(= 1.2V) for use as the internal reference volt-
eage. Also, an external load current can be obtained from the power supply at VREF pin, up to 1mA, maximum.
Please connect a capacitor of 0.01μF between VREF pin and SGND for stability.
Copyright©2010 THine Electronics, Inc.
13/21
THine Electronics, Inc.