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744770933 Scheda tecnica(PDF) 2 Page - Diodes Incorporated

Il numero della parte 744770933
Spiegazioni elettronici  60V HIGH ACCURACY BUCK/BOOST/BUCK-BOOST LED DRIVER CONTROLLER
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Produttore elettronici  DIODES [Diodes Incorporated]
Homepage  http://www.diodes.com
Logo DIODES - Diodes Incorporated

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ZXLD1370
ZXLD1370
Document number: DS32165 Rev. 2 - 2
2 of 33
www.diodes.com
May 2010
© Diodes Incorporated
A Product Line of
Diodes Incorporated
Pin Descriptions
Pin Name
Pin
Type
Description
ADJ
1
I
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
2
O
Internal 1.25V reference voltage output
TADJ
3
I
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
4
I/O
Shaping capacitor for feedback control loop
Connect 100pF ±20% capacitor from this pin to ground to provide loop compensation
STATUS
5
O
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
6
P
Signal ground (Connect to 0V)
PGND
7
P
Power ground - Connect to 0V and pin 8 to maximize copper area
N/C
8
-
Not Connected internally – recommend connection to pin 7, (PGND), to maximize PCB
copper for thermal dissipation
N/C
9
Not Connected internally – recommend connection pin 10 (GATE) to permit wide copper
trace to gate of MOSFET
GATE
10
O
Gate drive output to external NMOS transistor – connect to pin 9
VAUX
11
P
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
12
P
Input supply to device (6V to 60V)
Decouple to ground with capacitor close to device (refer to Applications section)
ISM
13
I
Current monitor input. Connect current sense resistor between this pin and VIN
The nominal voltage across the resistor is 225mV
FLAG
14
O
Flag open drain output
Pin is high impedance during normal operation
Pin switches low to indicate a fault, or warning condition
PWM
15
I
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)
GI
16
I
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
EP
PAD
P
Exposed paddle. Connect to 0V plane for electrical and thermal management
Notes:
. Type refers to whether or not pin is an Input, Output, Input/Output or Power supply pin.


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