ZXLD1321DCATC Diodes Zetex, ZXLD1321DCATC Datasheet - Page 4

• Manufacturer Part Number: ZXLD1321DCATC
• Description: IC LED DRVR WHITE BCKLGT 14-TDFN
• Manufacturer: Diodes Zetex
• Type: Backlight, White LEDr

Specifications of ZXLD1321DCATC

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Flash/Torch
• Type - Secondary: High Brightness LED (HBLED), White LED
• Frequency: 600kHz
• Voltage - Supply: 2 V ~ 12 V
• Mounting Type: Surface Mount
• Package / Case: 14-TDFN
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 1A
• Internal Switch(s): Yes
• Efficiency: 85%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Other names: ZXLD1321DCATR

Pin description
Issue 1 - January 2008
© Zetex Semiconductors plc 2008
Name
ADJ
BIAS
CFB
N/C
ISENSE
EMITTER
COLLECTOR
M_LOAD
M_VIN
VIN
TADJ
VREF
Exposed pad
Pin # Description
1
2
3
4
5
6, 7
8, 9
10
11
12
13
14
15
Adjust input
Bias pin for setting base current of internal switch transistor
Compensation point
No connection to this pin (open circuit)
Switch peak current sense pin
Switch emitters (connect both pins to top of R
Switch collectors (connect both pins to lower side of coil)
Load side input of high side current monitor
Input supply to high side current monitor
Positive supply to device (1.2-12V)
Temperature adjust input for LED thermal compensation
Internal 0.5V reference voltage output
Connect to ground (0V)
• Leave floating, or connect to VREF to set 100% output current.
• Drive with dc voltage. (50mV<VADJ< VREF) to adjust output
• Drive with low frequency (200Hz) PWM control signal to gate
• Drive with low level dc voltage (VADJ<28mV) to turn off device
• Short pin to ground to define maximum base drive current for
• Connect resistor (R
• Connect 10nF capacitor from this pin to ground to provide loop
• Connect resistor (R
• Connect to output voltage (cathode of Schottky)
• Connect resistor (R
• Decouple to ground with capacitor close to device
• Connect thermistor/resistor network to this pin to reduce output
• Connect to VREF to disable thermal compensation function
current from 10% to 100% of set value. (DC brightness control
mode)
output ‘on’ and ‘off’ at the PWM frequency. (PWM brightness
control mode)
(Standby mode)
output switch (Maximum output current condition)
drive current (Reduced output current condition)
compensation
switch current (ISW
nominal average output (LED) current of 0.1/R
current above a preset temperature threshold.
(see section on temperature control for details)
4
BIAS
SENSE
M
PEAK
) between M_LOAD and M_VIN to define
) from this pin to ground to reduce base
)=V
) from this pin to ground to define peak
SENSE
/R
SENSE
SENSE
to sense emitter current)
M
ZXLD1321
www.zetex.com