AT1386
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Function Description
1. Power Converter Functions
＊Reference voltage block
The reference voltage circuit generates a temperature independence voltage
(typical=2.3V) from the power source, which is used as reference voltage for the
IC’s internal circuitry and supply load current above 10mA to external device.
＊Triangular oscillator block
The triangular wave oscillator is generated by timing capacitor(CT) to incorporate
each other. The waveforms CT (amplitude of 0.3V to 0.8V), CTP (amplitude
0.3V to 0.8V in phase with CT) and CTN (amplitude 0.3V to 0.8V in inverse
phase with CT) are input to the PWM comparator.
＊Error amplifier block
The error amplifier outputs controlling error signal to PWM comparator from
sensing DC/DC converter output voltage. In addition, an arbitrary loop gain can
be set by connecting feedback resistor and capacitor from the output pin to
inverted input pin of the error amplifier, in order to make a stable system.
＊CH5 Inverting amplifier block
The inverting amplifier detects the DC/DC converter output voltage (negative)
and outputs a control signal to the error amplifier.
＊PWM comparator block
The PWM comparator is a voltage-to-pulse width converter for controlling the
duty cycle of DC/DC converter.
Channels 1, 2 main sides, channel 3, 4, 5, and 6 : The comparator keeps the
output transistor turn on while the error amplifier output voltage and DTC voltage
still higher than the triangular wave voltage.
Channels 1, 2 synchronous rectification sides : The comparator keeps the output
transistor turn on while the error amplifier output voltage still lower than the
triangular wave voltage.
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
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AIMTRON [ AIMTRON TECHNOLOGY ]
