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MC34845 Folha de dados(PDF) 8 Page - Freescale Semiconductor, Inc |
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MC34845 Folha de dados(HTML) 8 Page - Freescale Semiconductor, Inc |
8 / 21 page Analog Integrated Circuit Device Data 8 Freescale Semiconductor 34845 PIN CONNECTIONS STATIC AND DYNAMIC ELECTRICAL CHARACTERISTICS PIN CONNECTIONS Figure 3. 34845 Pin Connections Table 4. 34845 Pin Definitions Pin Number Pin Name Definition 1 VIN Main voltage supply Input. IC Power input supply voltage, is used internally to produce internal voltage regulation for logic functioning, and also as an input voltage for the boost regulator. 2 PGNDB Power ground. This is the ground terminal for the internal Boost FET. 3 SWB Boost switch node connection B. Switching node of boost converter. 4 SWA Boost switch node connection A. Switching node of boost converter. 5 PGNDA Power ground. This is the ground terminal for the internal Boost FET. 6 EN Enable pin (active high, internal pull-down). 7 - 12 CH1 - CH6 LED string connections 1 to 6. LED current drivers. Each line has the capability of driving up to 30 mA. 13, 19, 21 GND Ground Reference for all internal circuits other than the Boost FET. The Exposed Pad (EP) should be used for thermal heat dissipation. 14 FAIL Fault detected pin (open drain): No Failure = Low-impedance pull-down Failure = High-impedance When a fault situation is detected, this pin goes into high impedance. 15 ISET LED current setting. The maximum current is set using a resistor from this pin to GND. 16 PWM External PWM control signal. 17 COMP Boost compensation component connection. This passive terminal is used to compensate the boost converter. Add a capacitor and a resistor in series to GND to stabilize the system as well as a shunt capacitor. 18 WAKE Low power consumption mode for single wire control. This is achieved by connecting the WAKE and PWM pins together and grounding the ENABLE (EN) pin. 20 VDC1 2.5 V internal voltage decoupling. This pin is for internal use only, and not to be used for other purposes. A capacitor of 2.2 μF should be connected between this pin and ground. 22 OVP External boost over-voltage setting. Requires a resistor divider from VOUT to GND. If no external OVP setting is desired, this pin should be grounded. VIN PGNDB SWB SWA PGNDA GND EN WAKE ISET FAIL COMP PWM 24 17 18 19 20 21 22 23 1 8 7 6 5 4 3 2 16 910 11 12 13 14 15 EP GND TRANSPARENT TOP VIEW |
Nº de peça semelhante - MC34845 |
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Descrição semelhante - MC34845 |
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