ZXLD1374(2010) Просмотр технического описания (PDF) - Diodes Incorporated.
Номер в каталоге
Компоненты Описание
производитель
ZXLD1374
(Rev.:2010)
(Rev.:2010)
Diodes Incorporated.
ZXLD1374 Datasheet PDF : 35 Pages
| |||
Pin Descriptions
A Product Line of
Diodes Incorporated
ZXLD1374
Pin
Name
ADJ
REF
TADJ
SHP
STATUS
SGND
PGND
N/C
Pin
1
2
3
4
5
6
7,8
9, 10,
11, 12
Type
(Note 1)
I
O
I
I/O
O
P
P
-
Description
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.
Internal 1.25V reference voltage output
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).
Shaping capacitor for feedback control loop
Connect 100pF ±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.
Signal ground
Connect to 0V and pins 7 and 8.
Power ground
Connect to 0V and pin 6 to maximize copper area.
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
Auxiliary positive supply to internal switch gate driver
P
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
FLAG
18
PWM
19
GI
20
EP
PAD
Current monitor input
I
Connect current sense resistor between this pin and VIN.
The nominal voltage across the resistor is 225mV.
Flag open drain output
O 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.
I
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 LED current in Boost and Buck-boost modes.
Connect to ADJ in Buck mode operation.
I
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.
P
Exposed paddle.
Connect to 0V plane for electrical and thermal management.
Notes: 1. Type refers to whether or not pin is an Input, Output, Input/Output or Power supply pin.
ZXLD1374
Document number: DS35032 Rev. 1 - 2
Page 2 of 35
www.diodes.com
October 2010
© Diodes Incorporated
Share Link: