AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
2. Channel control function
The channels are turned on and turned off depending on the voltage levels at the CTL, CTL1,
CTL2, CTL3 and CTL4. Described as follow.
Voltage level at CTL pin
Channel on / off state
CTL
L
CLT1
X
CLT2
X
CLT3
X
CLT4
X
L
CH1
CH2
CH3
CH4
OFF (Standby state)
L
OFF
OFF
OFF
ON
L
H
L
H
L
H
L
ON
OFF
ON
H
L
L
OFF
OFF
OFF
ON
ON
ON
H
L
H
L
OFF
ON
H
L
H
OFF
OFF
OFF
ON
H
L
H
L
ON
OFF
ON
H
L
H
ON
OFF
OFF
ON
H
ON
ON
H
L
H
OFF
ON
H
X：Undefined
3. Protective Functions
•Short circuit protection and timer latch
The short circuit detection comparator in each channel detects the output voltage level of power
converter. When any channel output voltage falls below the short-circuit detection level, there is a
constant current bias charging the external capacitor CSCP which connected to the CSCP pin until
the capacitor voltage level reaches about 0.7V then turn off the output transistor and disable the IC.
It could reset the actuated protection by restart the power source.
•Under-voltage lockout protection
The under-voltage lockout protection is to disable the IC while the supply voltage transient state or
momentary decrease, which may cause the IC to malfunction. To prevent such malfunctions, the
under-voltage lockout protection circuit detects a decrease in internal reference voltage with
respect to the power supply voltage, turns off the output transistor, and sets the dead time to 100%
while holding the CSCP pin at the “L” level.
The circuit restores the output transistor to normal when the power source voltage reaches the
threshold voltage of the under-voltage lockout protection circuit.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
12
AIMTRON [ AIMTRON TECHNOLOGY ]
