MB3882 Fujitsu Media Devices, MB3882 Datasheet - Page 14

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MB3882

Manufacturer Part Number
MB3882
Description
2-channel DC/DC Converter IC with Synchronous Rectifier
Manufacturer
Fujitsu Media Devices
Datasheet

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14
MB3882
2. Channel Control Functions
3. Protective Functions
(1) Timer Latch Short Circuit Protection (SCP)
(2) Undervoltage Lockout Circuit Block (UVLO)
(3) Overvoltage Protection Block (OVP)
Channel ON/OFF control is provided by using the CS1 terminal (pin 4) and CS2 terminal (pin 21) setting functions.
The short circuit protection comparators read the output voltage levels. If the output voltage on either channel
falls below the short detection voltage, the timer circuit is activated to start charging the external capacitor Cscp
connected to the CSCP terminal (pin 22) .
When capacitor voltage reaches approximately 0.68 V the output FET turns off, setting the idle interval to 100 .
Once the protection circuit is activated, it can be reset by turning the power supply off and on again. (See “Setting
the Timer Latch Short Circuit Protector Time Constant.”)
Transient status during normal power-on or momentary drops in supply voltage can cause abnormal operation
in an control IC, leading to damage or degradation of system components. The undervoltage lockout circuit
prevents such abnormal operations by reading the internal reference voltage level and switching the output
transistor off, setting the idle interval to 100
System operation is restored when the supply voltage rises back about the undervoltage lockout circuit threshold
voltage.
The overvoltage protection circuit uses an overvoltage comparator (OVP Comp.) on each channel to read the
output voltage levels from the DC/DC converter. If the output voltage exceeds the threshold voltage a latch is
set, turning off the main side FET on the corresponding channel.
GND
GND
CS1
Hi-Z
Hi-Z
CS terminal voltage level
Channel On/Off Setting Functions
GND
GND
CS2
Hi-Z
Hi-Z
and holding the CSCP terminal (pin 22) to “L” level.
CH1
OFF
OFF
ON
ON
Channel output state
CH2
OFF
OFF
ON
ON

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