ZXLD1370EST16TC datasheet(2/36 Pages) DIODES

2 / 36 page

ZXLD1370

Document number: DS32165 Rev. 4 - 2

2 of 36

www.diodes.com

March 2011

A Product Line of

Diodes Incorporated

Pin Descriptions

Name

Type

(Note 2)

Description

ADJ

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

Internal 1.25V reference voltage output

TADJ

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

I/O

Shaping capacitor for feedback control loop

Connect 100pF ±20% capacitor from this pin to ground to provide loop compensation

STATUS

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

Signal ground (Connect to 0V)

PGND

Power ground - Connect to 0V and pin 8 to maximize copper area

N/C

Not Connected internally – recommend connection to pin 7, (PGND), to maximize PCB

copper for thermal dissipation

N/C

Not Connected internally – recommend connection pin 10 (GATE) to permit wide copper

trace to gate of MOSFET

GATE

Gate drive output to external NMOS transistor – connect to pin 9

VAUX

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

Input supply to device (6V to 60V)

Decouple to ground with capacitor close to device (refer to Applications section)

ISM

Current monitor input. Connect current sense resistor between this pin and VIN

The nominal voltage across the resistor is 225mV

FLAG

Flag open drain output

Pin is high impedance during normal operation

Pin switches low to indicate a fault, or warning condition

PWM

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)

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

PAD

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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