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744770933 Datasheet(PDF) 2 Page - Diodes Incorporated |
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744770933 Datasheet(HTML) 2 Page - Diodes Incorporated |
2 / 33 page ZXLD1370 ZXLD1370 Document number: DS32165 Rev. 2 - 2 2 of 33 www.diodes.com May 2010 © Diodes Incorporated A Product Line of Diodes Incorporated Pin Descriptions Pin Name Pin Type ‡ 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 provides some failsafe should they 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) PGND 7 P Power ground - Connect to 0V and pin 8 to maximize copper area N/C 8 - Not Connected internally – recommend connection to pin 7, (PGND), to maximize PCB copper for thermal dissipation N/C 9 Not Connected internally – recommend connection pin 10 (GATE) to permit wide copper trace to gate of MOSFET GATE 10 O Gate drive output to external NMOS transistor – connect to pin 9 VAUX 11 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 12 P Input supply to device (6V to 60V) Decouple to ground with capacitor close to device (refer to Applications section) ISM 13 I Current monitor input. Connect current sense resistor between this pin and VIN The nominal voltage across the resistor is 225mV FLAG 14 O Flag open drain output Pin is high impedance during normal operation Pin switches low to indicate a fault, or warning condition PWM 15 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 16 I Gain setting input Used to set the device in Buck mode or Boost, 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 they get overdriven EP PAD P Exposed paddle. Connect to 0V plane for electrical and thermal management Notes: ‡ . Type refers to whether or not pin is an Input, Output, Input/Output or Power supply pin. |
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