ZXLD1370 반도체 회로 부품 판매점
60V HIGH ACCURACY BUCK/BOOST/BUCK-BOOST LED DRIVER CONTROLLER
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 Diodes |
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Diodes Incorporated www.DataSheet4U.com
ZXLD1370
60V HIGH ACCURACY BUCK/BOOST/BUCK-BOOST LED DRIVER CONTROLLER
Description
The ZXLD1370 is an LED driver controller IC for driving
external MOSFETs to drive high current LEDs. It is a multi-
topology controller enabling it to efficiently control the current
through series connected LEDs. The multi-topology enables
it to operate in buck, boost and buck-boost configurations.
The 60V capability coupled with its multi-topology capability
enables it to be used in a wide range of applications and
drive in excess of 15 LEDs in series.
The ZXLD1370 is a modified hysteretic controller using a
patent pending control scheme providing high output current
accuracy in all three modes of operation. High accuracy
dimming is achieved through DC control and high frequency
PWM control.
The ZXLD1370 uses two pins for fault diagnosis. A flag
output highlights a fault, while the multi-level status pin gives
further information on the exact fault.
Pin Assignments
TSSOP-16 EP
Features
• 0.5% typical output current accuracy
• 6 to 60V operating voltage range
• LED driver supports Buck, Boost and Buck-boost
• configurations
• Wide dynamic range dimming
o 20:1 DC dimming
o 1000:1 dimming range at 500Hz
• Up to 1MHz switching
• High temperature control of LED current using TADJ
Typical Application Circuit
Buck-boost diagram utilizing thermistor and Tadj
Curve showing LED current vs. TLED
ZXLD1370
Document number: DS32165 Rev. 2 - 2
1 of 33
www.diodes.com
May 2010
© Diodes Incorporated
Pin Descriptions
A Product Line of
Diodes Incorporated www.DataSheet4U.com
ZXLD1370
Pin Name Pin Type‡
Description
Adjust input (for dc output current control)
Connect to REF to set 100% output current.
ADJ 1 I 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
Temperature Adjust input for LED thermal current control
Connect thermistor/resistor network to this pin to reduce output current above a preset
TADJ 3 I 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
Operation status output (analog output)
Pin is at 4.5V (nominal) during normal operation.
O 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
Auxiliary positive supply to internal switch gate driver
VAUX
11
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
12
P
Input supply to device (6V to 60V)
Decouple to ground with capacitor close to device (refer to Applications section)
ISM
FLAG
PWM
GI
EP
13
14
15
16
PAD
I Current monitor input. 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 device in Buck mode or Boost, 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 they get overdriven
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.
ZXLD1370
Document number: DS32165 Rev. 2 - 2
2 of 33
www.diodes.com
May 2010
© Diodes Incorporated
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ZXLD1370 led
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