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ZXLD1374 Datasheet(PDF) 2 Page - Diodes Incorporated |
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ZXLD1374 Datasheet(HTML) 2 Page - Diodes Incorporated |
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2 / 37 page  ZXLD1374 60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST LED DRIVER CONVERTER WITH AEC-Q100 ZXLD1374 Document number: DS35032 Rev. 2 - 2 2 of 37 www.diodes.com March 2011 © Diodes Incorporated A Product Line of Diodes Incorporated Pin Descriptions Pin Name Pin Type (Note 2) Description ADJ 1 I Adjust input (for dc output current control) Connect to REF to set 100% output current. Drive with dc voltage (125mV<VADJ< 2.5V) to adjust output current from 10% to 200% of set value. The ADJ pin has an internal clamp that limits the internal node to less than 3V. This prevents the LED and power switch from delivering too much current should ADJ get overdriven. REF 2 O Internal 1.25V reference voltage output TADJ 3 I Temperature Adjust input for LED thermal current control Connect thermistor/resistor network to this pin to reduce output current above a preset temperature threshold. Connect to REF to disable thermal compensation function (See section on thermal control). SHP 4 I/O Shaping capacitor for feedback control loop Connect 100pF ±20% capacitor from this pin to ground to provide loop compensation STATUS 5 O Operation status output (analog output) Pin is at 4.5V (nominal) during normal operation. Pin switches to a lower voltage to indicate specific operation warnings or fault conditions (See section on STATUS output). Status pin voltage is low during shutdown mode. SGND 6 P Signal ground Connect to 0V and pins 7 and 8. PGND 7,8 P Power ground Connect to 0V and pin 6 to maximize copper area. N/C 9, 10, 11, 12 - Not Connected internally To maximize PCB copper for thermal dissipation connect to pins 7 and 8. LX 13, 14 O Low-side power-switch output VAUX 15 P Auxiliary positive supply to internal switch gate driver Connect to VIN, or auxiliary supply from 6V to 15V supply to reduce internal power dissipation (Refer to application section for more details). Decouple to ground with capacitor close to device (refer to Applications section). VIN 16 P Input supply to device (6.3V to 60V) Decouple to ground with capacitor close to device (refer to Applications section). ISM 17 I Current monitor input Connect current sense resistor between this pin and VIN. The nominal voltage across the resistor is 225mV. FLAG 18 O Flag open drain output Pin is high impedance during normal operation. Pin switches low to indicate a fault, or warning condition. PWM 19 I Digital PWM output current control Pin driven either by open Drain or push-pull 3.3V or 5V logic levels. Drive with frequency higher than 100Hz to gate output ‘on’ and ‘off’ during dimming control. The device enters standby mode when PWM pin is driven with logic low level for more than 15ms nominal (Refer to application section for more details). GI 20 I Gain setting input Used to set the LED current in Boost and Buck-boost modes. Connect to ADJ in Buck mode operation. For Boost and Buck-boost modes, connect to resistive divider from ADJ to SGND. This defines the ratio of switch current to LED current (see application section). The GI pin has an internal clamp that limits the internal node to less than 3V. This provides some failsafe should the GI pin get overdriven. EP PAD P Exposed paddle. Connect to 0V plane for electrical and thermal management. Notes: 2. Type refers to whether or not pin is an Input, Output, Input/Output or Power supply pin. |
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