ZXLD1371EST16TC Diodes Inc. / Zetex, ZXLD1371EST16TC Datasheet - Page 2

• Manufacturer Part Number: ZXLD1371EST16TC
• Description: MOSFET LED Controller TSSOP TSSOP-16EP T&R 2.5K
• Manufacturer: Diodes Inc. / Zetex

Specifications of ZXLD1371EST16TC

• Rohs: yes

Pin Descriptions
ZXLD1371
Document number: DS35436 Rev. 1 - 2
Notes:
STATUS
SGND
PGND
Name
GATE
FLAG
TADJ
PWM
V
REF
SHP
ADJ
N/C
N/C
ISM
Pin
V
EP
GI
AUX
IN
2. Type refers to whether or not pin is an Input, Output, Input/Output or Power supply pin.
PAD
Pin
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
(Note 2)
Type
I/O
O
O
O
O
P
P
P
P
P
I
I
-
I
I
I
Internal 1.25V reference voltage output
Connect to REF to disable thermal compensation function. (See section on thermal
Signal ground (Connect to 0V)
Power ground - Connect to 0V and pin 8 to maximize copper area
Not Connected internally – recommend connection to pin 7, (PGND), to maximize PCB
Not Connected internally – recommend connection pin 10 (GATE) to permit wide copper
Adjust input (for dc output current control)
Connect to REF to set 100% output current.
Drive with dc voltage (125mV<V
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
Temperature Adjust input for LED thermal current control
Connect thermistor/resistor network to this pin to reduce output current above a preset
temperature threshold.
control.)
Shaping capacitor for feedback control loop
Connect 330pF ±20% capacitor from this pin to ground to provide loop compensation
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
copper for thermal dissipation
trace to gate of MOSFET
Gate drive output to external NMOS transistor – connect to pin 9
Auxiliary positive supply to internal switch gate driver
At V
At V
At V
auxiliary power supply (see Applications section). Decouple to ground with capacitor
close to device (see Applications section)
Input supply to device 5V to 60V
Decouple to ground with capacitor close to device (refer to Applications section)
Current monitor input. Connect current sense resistor between this pin and V
The nominal voltage, V
initially 225mV in Boost and Buck-Boost modes, varying with duty cycle.
Flag open drain output
Pin is high impedance during normal operation
Pin switches low to indicate a fault, or warning condition
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 and to control the
sense voltage in Boost and Buck-boost modes
Connect to ADJ pin for Buck mode operation
For Boost and Buck-boost modes, connect to resistive divider from ADJ to SGND. The
GI divider is required to compensate for duty cycle gating in the internal feedback loop
(see Application section). The GI pin has an internal clamp that limits the internal node to
less than 3V. This provides some failsafe should it become overdriven.
Exposed paddle. Connect to 0V plane for electrical and thermal management
IN
IN
IN
< 8V; a bootstrap circuit is recommended to ensure adequate gate drive voltage
> 8V; connect to V
>24V; to reduce power dissipation, V
(see Applications section)
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SENSE
2 of 42
IN
, across the resistor is 218mV fixed in Buck mode and
ADJ
< 1.25V) to adjust output current from 10% to 100%
Description
AUX
Diodes Incorporated
can be connected to an 8V to 15V
A Product Line of
© Diodes Incorporated
February 2012
ZXLD1371
IN