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CS5257A-1GT5 Datasheet(PDF) 3 Page - Cherry Semiconductor Corporation |
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CS5257A-1GT5 Datasheet(HTML) 3 Page - Cherry Semiconductor Corporation |
3 / 9 page Package Pin Description PACKAGE PIN # PIN SYMBOL FUNCTION 3 Block Diagram V CONTROL BIAS and TSD V REF EA IA V OUT V SENSE Adjust - + - + V POWER Electrical Characteristics: 0¡C ² TA ² 70¡C, 0¡C ² TJ ² 150¡C, VSENSE = VOUT and VAdj = 0V unless otherwise specified. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VPOWER Supply Only VPOWER = 6V, VCONTROL not connected, 0.1 1 mA Output Current VADJUST = VOUT = VSENSE = 0V Note 1: The minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor divider used to set the output voltage is selected to meet the minimum load current requirement. Note 2: The VCONTROL pin current is the drive current required for the output transistor. This current will track output current with roughly a 1:100 ratio. The minimum value is equal to the quiescent current of the device. Note 3: This parameter is guaranteed by design and is not 100% production tested. Note 4: Dropout is defined as either the minimum control voltage, (VCONTROL) or minimum power voltage (VPOWER) to output voltage differential required to maintain 1.5% regulation at a particular load current. Note 5: This parameter is guaranteed by design, but not parametrically tested in production. However, a 100% thermal shutdown functional test is performed on each part. 5L TO-220 1VSENSE This Kelvin sense pin allows for remote sensing of the output voltage at the load for improved regulation. It is internally connected to the positive input of the voltage sensing error amplifier. 2 Adjust This pin is connected to the low side of the internally trimmed 1.5% bandgap reference voltage and carries a bias current of about 50µA. A resistor divider from Adj to VOUT and from Adj to ground sets the output voltage. Also, transient response can be improved by adding a small bypass capacitor from this pin to ground. 3VOUT This pin is connected to the emitter of the power pass transistor and pro- vides a regulated voltage capable of sourcing 7A of current. 4VCONTROL This is the supply voltage for the regulator control circuitry. For the device to regulate, this voltage should be between 1V and 1.25V (depending on the output current) greater than the output voltage. The control pin current will be about 1% of the output current. 5VPOWER This is the power input voltage. The pin is physically connected to the collec- tor of the power pass transistor. For the device to regulate, this voltage should be between 0.1V and 0.65V greater than the output voltage, depend- ing on output current. The output load current of 7A is supplied through this pin. |
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