THV3058 Datasheet, PDF (14/21 Pages) THine Electronics, Inc. – 3CH (Buck/Boost) 2CH CP 1CH HVLDO Controller

THV3058_Rev.1.00_E
● Under Voltage Protection(UVP)
UVP circuit shuts down the power supply, when the under voltage condition continues for longer time than a predeter-
mined time. The internal comparator monitors the output voltage feedback pin. When the output voltage drops under a pre-
determined voltage, the timer latch circuit is activated (See Figure 5). When under voltage condition continues for more
than 12.2msec, the device stops switching operation and goes into latch state. The timer will be reset, if UVLO operates
before the device goes into the latch state.
In case of VGH and VGL, UVP is operated in 3msec after the startup. Please set the startup time of charge pumps within
15msec to prevent abnormal operation.
Output Voltage
Detection
AMP
or
COMP
-
+
VREF
UVP COMP
-
+
Vth
SCP Timer
Latch
Figure 5. Under Voltage Detection Circuit
● Over Voltage Protection(OVP)
OVP shuts down the power supply, when the output voltage of CH-1, CH-2 and CH-3 exceeds a predetermined volt-
age. When the voltage of INV1 pin exceeds 1.5V on CH-1, INV2 pin exceeds 1.06V on CH-2 and ,VO3_IN pin
exceeds 4.13V on CH-3, controller turns off an external MOS transistor and stops switching operation, respectively
(See Figure 6).
As to CH-2 and CH-3, when abnormal output is detected, timer latch circuit is activated. When abnormal output contin-
ues 2.44msec, the device stops switching operation and goes into the latch state.
Output Voltage _AMP
Dtection
-
+
SS
VREF
OVP COMP
-
+
Vth
PWM COMP
OUT
Figure 6. Over Voltage Detection Circuit
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THine Electronics, Inc.