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ZXLD1322 Datasheet(PDF) 4 Page - Zetex Semiconductors

Part No. ZXLD1322
Description  Buck/boost mode DC-DC converter for LED driving with 700mA output and current control
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Maker  ZETEX [Zetex Semiconductors]
Homepage  http://www.diodes.com/
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ZXLD1322 Datasheet(HTML) 4 Page - Zetex Semiconductors

 
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ZXLD1322
Issue 1 - January 2008
4
www.zetex.com
© Zetex Semiconductors plc 2008
Pin description
Name
Pin # Description
ADJ
1
Adjust input
• Leave floating, or connect to VREF to set 100% output current.
• Drive with dc voltage. (50mV<VADJ< VREF) to adjust output
current from 10% to 100% of set value. (DC brightness control
mode)
• Drive with low frequency (200Hz) PWM control signal to gate
output ‘on’ and ‘off’ at the PWM frequency. (PWM brightness
control mode)
• Drive with low level dc voltage (VADJ<28mV) to turn off device
(Standby mode)
BIAS
2
Bias pin for setting base current of internal switch transistor
• Short pin to ground to define maximum base drive current for
output switch (Maximum output current condition)
• Connect resistor (RBIAS) from this pin to ground to reduce base
drive current (Reduced output current condition)
CFB
3
Control input/output for feedback control loop
• Connect 10nF capacitor from this pin to ground to provide loop
compensation
N/C
4
Not connected internally (Open circuit)
ISENSE
5
Switch peak current sense pin
• Connect resistor (Rsense) from this pin to ground to define peak
switch current (ISWPEAK)=0.05/RS
EMITTER1
6
Switch emitters (Connect both pins to top of RSENSE to sense emitter current)
EMITTER2
7
COLLECTOR2
8
Switch Collectors (Connect both pins to lower side of coil)
COLLECTOR1
9
N/C
10
Internally connected - Do not connect to external circuitry
M_VIN
11
Input supply to high side current monitor
• Connect output voltage (whichever is higher)
• Connect resistor (RM) from this pin to to VIN to define nominal
average output (LED) current of 0.1/RM
VIN
12
Input supply voltage and load side input of high side current monitor.
Connect to sensing resistor RM.
TADJ
13
Temperature Adjust input for LED thermal compensation
• Connect thermistor/resistor network to this pin to reduce output
current above a preset temperature threshold.
• Connect to VREF to disable thermal compensation function
(see section on temperature control for details)
VREF
14
Internal 0.5V reference voltage output
Exposed pad
15
Connect to ground (0V)


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