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A special device for LED driving applications
20 November 2002, Power Electronics / Power Management
'Power logics' are logic devices that have an embedded power front-end. Providing a direct control link to system electrical loads, they eliminate the use of both standard logic ICs and discrete power devices. The STPIC6C595 is a monolithic, medium-voltage, low-current power, 8 bit shift register designed for use in systems that require relatively moderate load powers such as LEDs. The device from ST Microelectronics contains a built-in voltage clamp on the outputs for inductive transient protection.
The logic functions of the STPIC6C595 consist of the same logic functions that exist in the high-speed CMOS (HCMOS) M74HC595, except that the outputs are inverted relative to the HCMOS version. The eight DMOS switches are controlled from a single input, SER IN (serial input) and by an 8 bit serial word. Each of the eight DMOS switches are equipped with an internal 33 V drain-to-gate zener clamp that greatly enhances their capability to switch unclamped inductive loads.
The logic used is specified to operate from 4,5 to 5,5 V, but it is capable of operation down to 3 V and up to an absolute maximum voltage of 7 V.
Operating mode
Data is transferred through an 8 bit shift register on the rising edge of SRCK. The data in the shift register is latched to the outputs by the rising edges on RCK. All outputs are placed in a high-impedance mode with a high level on G, but the data is not cleared from the storage register latches. CLR clears all data in the shift register only. SER OUT is provided at the last bit of the shift register to allow cascading in applications requiring more than eight DMOS switches.
Features
Key features of this device are: low RDS(ON) = 4 Ω; eight 100 mA DMOS outputs; low power consumption: ICC = 200 mA (max); high speed: tPLH = 130 ns, tPHL = 80 ns (typ); offered in SO-16 package. For more information contact Electrocomp (Value Added Reseller), 011 458 9000, sales@electrocomp.co.za |
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