ZXLD1374_11 DIODES [Diodes Incorporated], ZXLD1374_11 Datasheet - Page 2

• Manufacturer Part Number: ZXLD1374_11
• Description: 60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST
• Manufacturer: DIODES [Diodes Incorporated]

ZXLD1374
Document number: DS35032 Rev. 2 - 2
Pin Descriptions
Notes:
STATUS
SGND
PGND
Name
FLAG
PWM
V
REF
T
SHP
ADJ
N/C
ISM
Pin
V
EP
LX
GI
ADJ
AUX
IN
2. Type refers to whether or not pin is an Input, Output, Input/Output or Power supply pin.
11, 12
13, 14
9, 10,
PAD
Pin
7,8
15
16
17
18
19
20
1
2
3
4
5
6
(Note 2)
Type
I/O
O
O
P
P
O
P
P
O
P
I
I
-
I
I
I
Internal 1.25V reference voltage output
Connect to REF to disable thermal compensation function (See section on thermal control).
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.
Adjust input (for dc output current control)
Connect to REF to set 100% output current.
Drive with dc voltage (125mV<V
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.
Temperature Adjust input for LED thermal current control
Connect thermistor/resistor network to this pin to reduce output current above a preset
temperature threshold.
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.
Low-side power-switch output
Auxiliary positive supply to internal switch gate driver
Connect to V
dissipation (Refer to application section for more details).
Decouple to ground with capacitor close to device (refer to Applications section).
Input supply to device (6.3V 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 across the resistor is 225mV.
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 LED current in Boost and 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 the GI pin get overdriven.
Exposed paddle.
Connect to 0V plane for electrical and thermal management.
60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST
IN
, or auxiliary supply from 6V to 15V supply to reduce internal power
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LED DRIVER CONVERTER WITH AEC-Q100
ADJ
< 2.5V) to adjust output current from 10% to 200% of
Description
Diodes Incorporated
A Product Line of
IN
.
© Diodes Incorporated
ZXLD1374
March 2011