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PDF MAX16832C Data sheet ( Hoja de datos )
| Número de pieza | MAX16832C | |
| Descripción | High-Brightness LED Drivers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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MAX16832A/MAX16832C
EVALUATION KIT AVAILABLE
2MHz, High-Brightness LED Drivers
with Integrated MOSFET and
High-Side Current Sense
General Description
The MAX16832A/MAX16832C step-down constant-cur-
rent high-brightness LED (HB LED) drivers provide a
cost-effective design solution for automotive
interior/exterior lighting, architectural and ambient light-
ing, LED bulbs, and other LED illumination applications.
The MAX16832A/MAX16832C operate from a +6.5V to
+65V input voltage range and can provide an output
current up to 700mA, if operated up to a temperature of
+125°C, or up to a 1A if operated up to a temperature
of +105°C. A high-side current-sense resistor adjusts
the output current, and a dedicated pulse-width modu-
lation (PWM) input enables pulsed LED dimming over a
wide range of brightness levels.
These devices are well suited for applications requiring
a wide input voltage range. The high-side current sens-
ing and an integrated current-setting circuitry minimize
the number of external components while delivering an
average output current with ±3% accuracy. A hysteretic
control method ensures excellent input supply rejection
and fast response during load transients and PWM dim-
ming. The MAX16832A allows 10% current ripple, and
the MAX16832C allows 30% current ripple. Both
devices operate up to a 2MHz switching frequency,
thus allowing the use of small-sized components.
The MAX16832A/MAX16832C offer an analog dimming
feature that reduces the output current by applying an
external DC voltage below the internal 2V threshold volt-
age from TEMP_I to GND. TEMP_I also sources 25µA to
a negative temperature coefficient (NTC) thermistor con-
nected between TEMP_I and GND, thus providing an
analog thermal-foldback feature that reduces the LED
current when the temperature of the LED string exceeds
a specified temperature point. Additional features
include thermal-shutdown protection.
The MAX16832A/MAX16832C operate over the -40°C to
+125°C automotive temperature range and are available
in a thermally enhanced 8-pin SO package.
Applications
• Architectural, Industrial, and Ambient Lighting
• Automotive RCL, DRL, and Fog Lights
• Heads-Up Displays
• Indicator and Emergency Lighting
• PoE Powered Lighting
Benefits and Features
• Cost-Effective Solution for a Wide Range of LED
Lighting Applications
• 6.5V to 65V Input Voltage Range
• Output Current Up to 1A
• ±3% LED Current Accuracy
• Selectable Dimming Options: Linear or PWM
• Minimal Component Count Saves Cost and Space
• On-Board 65V, 0.45Ω Power MOSFET
• Resistor-Programmable Constant LED Current
• Integrated High-Side Current Sense with 200mV
Current-Sense Reference
• Hysteretic Control: Up to 2MHz Switching
Frequency
• Protection Features and Wide Operating
Temperature Range Improves Lighting Fixture
Reliability
• Thermal-Foldback Protection Dims LEDs to
Minimize Overheating
• Thermal-Shutdown Protection
• Available in a Thermally Enhanced 8-Pin SO Package
• Operation over -40°C to +125°C Temperature Range
Ordering Information and Pin Configuration appear at end
of data sheet.
Typical Application Circuit
D1
VIN
RSENSE
HB LEDs
L1
C2
1 CS
TEMP_I 8
NTC* ON
2 IN
DIM 7
OFF
MAX16832A
C1
3
MAX16832C
GND
LX 6
4
PGND
5
LX
*OPTIONAL
19-4140; Rev 7; 2/15
1 page  
MAX16832A/MAX16832C
2MHz, High-Brightness LED Drivers
with Integrated MOSFET and
High-Side Current Sense
Typical Operating Characteristics (continued)
(VIN = VDIM = 48V, RSENSE = 0.3Ω, L = 220µH (connected between IN and CS). Typical values are at TA = +25°C, unless otherwise
noted.)
LXRDSON
vs. TEMPERATURE
0.7
VIN = 65V
0.6
VIN = 48V
0.5
0.4
VIN = 6.5V
0.3
0.2
0.1
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
ITEMP_I
vs. TEMPERATURE
30.0
29.5
29.0
28.5
28.0
27.5
27.0
26.5
26.0
25.5
VIN = 48V
25.0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Pin Description
PIN NAME
1 CS
2 IN
3 GND
4 PGND
5, 6 LX
7 DIM
8 TEMP_I
— EP
FUNCTION
Current-Sense Input. Connect a resistor between IN and CS to program the LED current.
Positive Supply Voltage Input. Bypass with a 1µF or higher value capacitor to GND.
Ground
Power Ground
Switching Node
Logic-Level Dimming Input. Drive DIM low to turn off the current regulator. Drive DIM high to
enable the current regulator.
Thermal Foldback Control and Linear Dimming Input. Bypass with a 0.01µF capacitor to GND if
thermal foldback or analog dimming is used. See the Thermal Foldback section.
Exposed Pad. Connect EP to a large-area ground plane for effective power dissipation. Do not use
as the IC ground connection.
Detailed Description
The MAX16832A/MAX16832C are step-down, constant-
current, HB LED drivers. These devices operate from a
+6.5V to +65V input voltage range. The maximum output
is 1A, if the part is used at temperatures up to TA =
+105°C, or 700mA, if it is used up to TA = +125°C. A
high-side current-sense resistor sets the output current
and a dedicated PWM dimming input enables pulsed
LED dimming over a wide range of brightness levels.
A high-side current-sensing scheme and an on-board
current-setting circuitry minimize the number of exter-
nal components while delivering LED current with ±3%
accuracy, using a 1% sense resistor. See Figure 1 for a
functional diagram.
www.maximintegrated.com
Maxim Integrated | 5
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| PDF Descargar | [ Datasheet MAX16832C.PDF ] | |
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