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PDF ZXLD1374 Data sheet ( Hoja de datos )
| Número de pieza | ZXLD1374 | |
| Descripción | 60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST LED DRIVER CONVERTER | |
| Fabricantes | Diodes | |
| Logotipo |  |
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A Product Line of
Diodes Incorporated
ZXLD1374
60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST
LED DRIVER CONVERTER WITH AEC-Q100
Description
The ZXLD1374 is a 60V LED driver with integrated 1.5A low side
switch to drive high current LEDs. It is a multi-topology converter
enabling it to operate in Buck, Boost and Buck-boost configurations;
efficiently controlling the current of up to 16-series connected LEDs.
The ZXLD1374 is a modified hysteretic converter using a patent
pending control scheme providing high output current accuracy in all
three topologies. High accuracy dimming is achieved through
DC control and high frequency PWM control.
The ZXLD1374 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.
The ZXLD1374 has been qualified to AEC-Q100 Grade 1 enabling
operation in ambient temperatures from -40 to +125°C.
Pin Assignments
ADJ 1
REF 2
TADJ 3
SHP 4
STATUS 5
SGND 6
PGND 7
PGND 8
N/C 9
N/C 10
Thermal
Pad
20 GI
19 PWM
18 FLAG
17 ISM
16 VIN
15 VAUX
14 LX
13 LX
12 N/C
11 N/C
Features
• 0.5% Typical Output Current Accuracy
• 6.3 to 60V Operating Voltage Range
• 1.5A Integrated Low Side Switch
• LED Driver Supports Buck, Boost and Buck-Boost Topologies
• Wide Dynamic Range Dimming
• 20:1 DC Dimming
• 1000:1 Dimming Range at 500Hz
• Up to 1MHz Switching
• High Temperature Control of LED Current Using TADJ
• AEC-Q100 Grade 1
• TSSOP-20EP: Available in “Green” Molding Compound (No Br,
Sb) with lead Free Finish/ RoHS Compliant
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen and Antimony free, "Green" and Lead-Free.
3. Halogen and Antimony free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
Typical Applications Circuit
VIN
C1
RGI2
R4
GND
RGI2 TH1
R1
PWVMAUX VIN ISM
GI LX
ADJ ZXLD1374 LX
REF FLAG
TADJ
STATUS
SHP NC SGND PGND
C2
100pF
L1
SD1
PSD3200
COUT
ZXLD1374
Document number: DS35032 Rev. 3 - 2
1 of 39
www.diodes.com
September 2012
© Diodes Incorporated
1 page  
A Product Line of
Diodes Incorporated
ZXLD1374
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
VIN Input Supply Voltage Range
VAUX Auxiliary Supply Voltage Range (Note 8)
Performance/Comment
Min Max Unit
Normal operation
Reduced performance operation (Note 7)
8
6.3
60
V
Normal operation
Reduced performance operation (Note 7)
8
6.3
60
V
VSENSE
VLX
ILX
VADJ
Differential Input Voltage
Low Side Switch Output Voltage
Low Side Switch Continuous Output Current
External DC Control Voltage Applied to ADJ Pin to
Adjust Output Current
VVIN-VISM, with 0 ≤ VADJ ≤ 2.5
DC brightness control mode
from 10% to 200%
0
0.125
450
60
1.5
2.5
mV
V
A
V
ISTATUS
IREF
fSW
VTADJ
Status Pin Output Current
Reference External Load Current
Recommended Switching Frequency Range (Note 9)
Temperature Adjustment (TADJ) Input Voltage Range
fPWM Recommended PWM Dimming Frequency Range
REF sourcing current
To maintain 1000:1 resolution
To maintain 200:1 resolution
100 µA
1 mA
300 1000 kHz
0 VREF V
100 500
Hz
100 1000
Hz
tPWMH/L
VPWMH
VPWML
TJ
GI
PWM Pulse Width in Dimming Mode
PWM Pin High Level Input Voltage
PWM Pin Low Level Input Voltage
Operating Junction Temperature Range
Gain Setting Ratio for Boost and Buck-Boost Modes
PWM input high or low
Ratio= VGI/VADJ
0.005
2
0
-40
0.20
10
5.5
0.4
+125
0.50
ms
V
V
°C
Notes:
7. Device is guaranteed to have started up by 6.5V and as such the minimum applied supply voltage has to be above 6.5V (plus any noise margin).
The ZXLD1374 will, however, continue to function when the input voltage is reduced from ≥ 8V down to 6.3V.
When operating with input voltages below 8V the output current and device parameters may deviate from their normal values; and is dependent on
power MOSFET switch, load and ambient temperature conditions. To ensure best operation in Boost and Buck-boost modes with input voltages, VIN,
between 6.5 and 12V a suitable boot-strap network on VAUX pin is recommended. Performance in Buck mode will be reduced at input voltages (VIN,
VAUX) below 8V. – A boot-strap network cannot be implemented in buck mode.
8. VAUX can be driven from a voltage higher than VIN to provide higher efficiency at low VIN voltages, but to avoid false operation; a voltage should not
be applied to VAUX in the absence of a voltage at VIN.
9. The device contains circuitry to control the switching frequency to approximately 400kHz. The maximum and minimum operating frequency is not
tested.
ZXLD1374
Document number: DS35032 Rev. 3 - 2
5 of 39
www.diodes.com
September 2012
© Diodes Incorporated
5 Page 
A Product Line of
Diodes Incorporated
ZXLD1374
Typical Characteristics – Buck Mode – RS = 291mΩ, L = 35µH, ILED = 750mA
0.825
0.800
TA = 25°C
VAUX = VIN
L = 33µH
RS = 291mΩ
0.775
1 LED
3 LEDs
5 LEDs
7 LEDs
9 LEDs
11 LEDs
0.750
13 LEDs
15 LEDs
0.725
0.700
0.6756
12
1000
900
800
700
600
TA = 25°C
VAUX = VIN
L = 33µH
RS = 291mΩ
18 24 30
36 42
48
INPUT VOLTAGE (V)
Figure 14 ILED vs. Input Voltage and Number of LED
5 LEDs
7 LEDs
9 LEDs
11 LEDs
500
3 LEDs
400
13 LEDs
300
200
1 LED
100
0 6 12 18 24 30 36 42 48
INPUT VOLTAGE (V)
Figure 15 Frequency ZXLD1374 - Buck Mode = L = 47μH
100%
5 LEDs
7 LEDs
9 LEDs
11 LEDs
13 LEDs
95%
90%
3 LEDs
85%
80%
1 LED
75%
70%
65%
60%
6
TA = 25°C
VAUX = VIN
L = 33µH
RS = 291mΩ
12 18 24 30 36 42 48
INPUT VOLTAGE (V)
Figure 16 Efficiency vs. Input Voltage and Number of LED
ZXLD1374
Document number: DS35032 Rev. 3 - 2
11 of 39
www.diodes.com
54 60
15 LEDs
54 60
15 LEDs
54 60
September 2012
© Diodes Incorporated
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ZXLD1374.PDF ] | |
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