3301 Triconex Digital Input Module

3301 Triconex Digital Input Module

The 3301 Triconex voltage regulator is a DC-to-DC buck convertor that attains an oscillation frequency of 300 kHz,and has an integrated miniaturized choke coil, allowing it to serve as a small, high efficiency power supply in a compact 3301 Triconex  package.The switching regulator function realizes a high efficiency switching regulator operation without adjustment, requiring only six external support components, and an optional capacitor for soft start operation and an optional transistor for on/off control. The SI-8008TM includes overcurrent and overheating protection circuits.
Applications include:
▪ DVD recorder
▪ FPD TV
▪ Telecommunications equipment
▪ Office automation equipment, such as printers
▪ On-board local power supply
▪ Output voltage regulator for second stage of SMPS
(switched mode power supply)

3301 Triconex Digital Input Module

3301 Triconex Digital Input Module

The 3301 Triconex terminal is used to enable soft start and to control on/off operation of the IC output,VO (see figure 2). To enable soft start, connect a capacitor between SS and ground. To control on/off operation, connect an NPN bipolar transistor, in a TTL open collector output configuration, between the3008 Triconex and GND. Turn off is done by decreasing VSSL below its rated level.When both soft start and VO on/off are used, a protection measure such as current limiting is required because, if the capacitance of C3 large, the discharge current of C3 flows across the transistor for on/off operation. Because a pull-up type resistor is provided inside the IC, no external voltage can be applied.If the winding resistance of the choke coil is too high, the efficiency may go down to the extent that it is out of the rating.Because the overcurrent protection start current is approximately 2.5 A, attention must be paid to the heating of the choke coil by the magnetic saturation due to overload or short-circulated load.As large ripple currents flow across C1 and C2, capacitors with high frequency and low impedance for SMPS must be used. Especially when the impedance of C2 is high, the switching waveform may not be normal at low temperature. Please use neither OS capacitors nor tantalum capacitors which cause an abnormal oscillation for C2.C3 is a capacitor for soft start. In case soft start function is not used, please keep the SS terminal open. A pull-up resistor is provided inside the IC.

3301 Triconex Digital Input Module

3301 Triconex Digital Input Module

Features and Benefits
▪ 1.5 A output current supplied in a small power surface mount package
▪ High efficiency: 81% at VIN = 15 V, IO = 0.5 A,VO = 5 V
▪ Requires only six external components (optional soft
start requires an additional capacitor)
▪ Oscillation circuit built-in (frequency 300 kHz typical
▪ Constant current type overcurrent protection circuit and
an overheating protection circuit built in
▪ Soft start function built-in (can be implemented as an
ON/OFF function, output OFF state at low level)
▪ Low consumption current during output OFF state

3301 Triconex Digital Input Module

When tests are carried out during inspection testing and other standard test periods, protect the products from power surges from the testing device, shorts between the product pins, and wrong connections. Ensure all test parameters are within the ratings specified by Sanken for the products.Volatile-type silicone greases may crack after long periods of time, resulting in reduced heat radiation effect. Silicone greases with low consistency (hard grease) may cause cracks in the mold resin when screwing the products to a heatsink.When soldering the products, please be sure to minimize the working time, within the following limits:
260±5°C 10±1 s (Flow, 2 times)
380±10°C 3.5±0.5 s (Soldering iron, 1 time)

3301 Triconex Digital Input Module

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