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PDF MAX16801A Data sheet ( Hoja de datos )
| Número de pieza | MAX16801A | |
| Descripción | Offline and DC-DC PWM Controllers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3880; Rev 2; 1/10
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
Offline and DC-DC PWM Controllers for
High-Brightness LED Drivers
General Description
The MAX16801A/B/MAX16802A/B high-brightness (HB)
LED driver-control ICs contain all the circuitry required
for the design of wide-input-voltage-range LED drivers
for general lighting and display applications. The
MAX16801 is well suited for universal input (rectified
85VAC to 265VAC) LED drivers, while the MAX16802 is
intended for low-input-voltage (10.8VDC to 24VDC) LED
drivers.
When the LED current needs to be tightly regulated, an
additional on-board error amplifier with 1% accurate ref-
erence can be utilized. A wide dimming range can be
implemented by using low-frequency PWM dimming.
The MAX16801/MAX16802 feature an input undervoltage
lockout (UVLO) for programming the input-supply start
voltage, and to ensure proper operation during brownout
conditions. The MAX16801 has an internal-bootstrap
undervoltage lockout circuit with a large hysteresis that
simplifies offline LED driver designs. The MAX16802 does
not have this internal bootstrap circuit and can be biased
directly from a +12V rail.
The 262kHz fixed switching frequency is internally
trimmed, allowing for optimization of the magnetic and fil-
ter components, resulting in a compact, cost-effective
LED driver. The MAX16801A/MAX16802A are offered with
50% maximum duty cycle. The MAX16801B/MAX16802B
are offered with 75% maximum duty cycle. These devices
are available in an 8-pin µMAX® package and operate
over the -40°C to +85°C temperature range.
Offline and DC-DC LED
Drivers
RGB Back Light for LCD
TVs and Monitors
Applications
Commercial and
Industrial Lighting
Decorative and
Architectural Lighting
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Features
♦ Suitable for Buck, Boost, Flyback, SEPIC, and
Other Topologies
♦ Up to 50W or Higher Output Power
♦ Universal Offline Input Voltage Range: Rectified
85VAC to 265VAC (MAX16801)
♦ IN Pin Directly Driven From 10.8VDC to 24VDC
Input (MAX16802)
♦ Internal Error Amplifier with 1% Accurate
Reference for Precise LED Current Regulation
♦ PWM or Linear Dimming
♦ Fixed Switching Frequency of 262kHz ±12%
♦ Thermal Shutdown
♦ Digital Soft-Start
♦ Programmable Input Startup Voltage
♦ Internal Bootstrap UVLO with Large Hysteresis
(MAX16801)
♦ 45µA (typ) Startup Supply Current, 1.4mA (typ)
Operating Supply Current
♦ 50% (MAX16801A/MAX16802A) or 75%
(MAX16801B/MAX16802B) Maximum Duty Cycle
♦ Available in a Tiny 8-Pin µMAX Package
Ordering Information
PART
TEMP
RANGE
MAX16801AEUA+
-40°C to +85°C
MAX16801BEUA+
-40°C to +85°C
MAX16802AEUA+
-40°C to +85°C
MAX16802BEUA+
-40°C to +85°C
+Denotes lead-free package.
PIN-
PACKAGE
8 µMAX
8 µMAX
8 µMAX
8 µMAX
Typical Operating Circuit
10.8VDC TO 24VDC
ENABLE
PWM
UVLO/EN
IN
DIM/FB
VCC
MAX16802B
COMP
CS
NDRV
GND
L1 C3 LEDs
D1
Q1
C1 C2
R1
GND
Warning: The MAX16801/MAX16802 are designed to work with high voltages. Exercise caution.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
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Offline and DC-DC PWM Controllers for
High-Brightness LED Drivers
Typical Operating Characteristics (continued)
(VUVLO/EN = +1.4V, VFB = +1V, COMP = unconnected, VCS = 0V, TA = +25°C, unless otherwise noted.)
CURRENT-SENSE THRESHOLD
30
TOTAL NUMBER OF
DEVICES = 200
25
20
15
10
5
SWITCHING FREQUENCY
vs. TEMPERATURE
280
275 +3σ
TOTAL NUMBER OF
DEVICES = 100
270
265
MEAN
260
255
250
-3σ
245
SWITCHING FREQUENCY
30
TOTAL NUMBER OF
DEVICES = 200
25
20
15
10
5
0
260
270 280 290 300 310
CURRENT-SENSE THRESHOLD (mV)
320
240
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
0
230
240 250 260 270 280
SWITCHING FREQUENCY (kHz)
290
PROPAGATION DELAY FROM
CURRENT-SENSE COMPARATOR INPUT
TO NDRV vs. TEMPERATURE
75
70
65
60
55
50
-40 -20
0
20 40 60
TEMPERATURE (°C)
80
INPUT CURRENT
vs. INPUT CLAMP VOLTAGE
10
9
8
7
6
5
4
3
2
1
0
10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0
INPUT VOLTAGE (V)
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
-40
UVLO/EN PROPAGATION DELAY
vs. TEMPERATURE
UVLO/EN RISING
UVLO/EN FALLING
-20 0 20 40 60 80
TEMPERATURE (°C)
27.0
26.8
26.6
26.4
26.2
26.0
25.8
25.6
25.4
25.2
25.0
-40
INPUT CLAMP VOLTAGE
vs. TEMPERATURE
IIN = 2mA
-20 0 20 40 60
TEMPERATURE (°C)
80
REFERENCE VOLTAGE
vs. TEMPERATURE
1.230
VIN = 12V
1.229
1.228
1.227
1.226
1.225
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
NDRV OUTPUT IMPEDANCE
vs. TEMPERATURE
2.2
2.1
VIN = 24V
SINKING 100mA
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
-40 -20 0 20 40 60
TEMPERATURE (°C)
80
_______________________________________________________________________________________ 5
5 Page 
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Offline and DC-DC PWM Controllers for
High-Brightness LED Drivers
Application Circuits
Figure 5 shows an offline application of an HB LED dri-
ver using the MAX16801. The use of transformer T1
allows significant design flexibility. Use the internal
error amplifier for a very accurate LED current control.
Figure 6 shows a discontinuous flyback LED driver with
linear dimming capability. The total LED voltage can be
lower or higher than the input voltage.
Figure 7 shows a continuous-conduction-mode HB LED
buck driver with linear dimming and just a few external
components.
Figure 8 shows an offline isolated flyback HB LED dri-
ver with low-frequency PWM using MAX16801. The
PWM signal needs to be inverted (see the Functional
Diagram). Transformer T1 provides full safety isolation
and operation from universal AC line (85VAC to
265VAC).
VSUPPLY
R1
C1
GND
IN
VCC
C2
C3
COMP
R6 DIM/FB
R2
NDRV
MAX16801
CS
GND
UVLO/EN
R3
R5
D1 T1
D2
C4
Q1
R4
Figure 5. Offline, Nonisolated, Flyback LED Driver with Programmable Input-Supply Start Voltage
VOUT
LEDs
R7
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX16801A.PDF ] | |
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