MAX16814A_ _.............................................. -40NC to +125NC
MAX16814BE_ _ ............................................. -40NC to +85NC
MAX16814U_ _and MAX16814BU_ _ ................0NC to +85NC
Junction Temperature .....................................................+150NC
Storage Temperature Range............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
20 TQFN/QFND
Junction-to-Ambient Thermal Resistance (B
JA
) ........ +39NC/W
Junction-to-Case Thermal Resistance (B
JC
)............... +6NC/W
20 TSSOP
Junction-to-Ambient Thermal Resistance (B
JA
) ..... +37.7NC/W
Junction-to-Case Thermal Resistance (B
JC
)............ +2.0NC/W
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to
http://www.maximintegrated.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(V
IN
= V
EN
= 12V, R
RT
= 12.25kI, R
SETI
= 15kI, C
VCC
= 1FF, V
CC
= V
DRV
, NDRV = COMP = OUT_ = unconnected, V
RSDT
= V
DIM
= V
CC
, V
OVP
= V
CS
= V
LEDGND
= V
PGND
= V
SGND
= 0V, T
A
= T
J
= -40NC to +125NC for MAX16814A_ _, T
A
= -40NC to +85NC for
MAX16814BE_ _, and T
A
= T
J
= 0NC to +85NC for MAX16814U_ _ and MAX16814BU_ _, unless otherwise noted. Typical values are at
T
A
= +25NC.) (Note 2)
PARAMETER
Operating Voltage Range
Active Supply Current
Standby Supply Current
IN Undervoltage Lockout
IN UVLO Hysteresis
V
CC
REGULATOR
Regulator Output Voltage
Dropout Voltage
Short-Circuit Current Limit
V
CC
Undervoltage Lockout
Threshold
V
CC
UVLO Hysteresis
RT OSCILLATOR
Switching Frequency Range
f
SW
200
2000
kHz
V
CC
6.5V < V
IN
< 10V, 1mA < I
LOAD
< 50mA
10V < V
IN
< 40V, 1mA < I
LOAD
< 10mA
V
IN
- V
CC
, V
IN
= 4.75V, I
LOAD
= 50mA
V
CC
shorted to SGND
V
CC
rising
4.75
5.0
200
100
4
100
5.25
500
V
mV
mA
V
mV
SYMBOL
V
IN
I
IN
MAX16814A_ _ and MAX16814U_ _
MAX16814B_ _ _ only
V
EN
= 0V
V
IN
rising
3.975
CONDITIONS
MIN
4.75
2.5
2.75
15
4.3
170
TYP
MAX
40
5
5.5
40
4.625
UNITS
V
mA
µA
V
mV
2
Maxim Integrated
MAX16814
Integrated, 4-Channel, High-Brightness LED
Driver with High-Voltage DC-DC Controller
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
EN
= 12V, R
RT
= 12.25kI, R
SETI
= 15kI, C
VCC
= 1FF, V
CC
= V
DRV
, NDRV = COMP = OUT_ = unconnected, V
RSDT
= V
DIM
= V
CC
, V
OVP
= V
CS
= V
LEDGND
= V
PGND
= V
SGND
= 0V, T
A
= T
J
= -40NC to +125NC for MAX16814A_ _, T
A
= -40NC to +85NC for
MAX16814BE_ _, and T
A
= T
J
= 0NC to +85NC for MAX16814U_ _ and MAX16814BU_ _, unless otherwise noted. Typical values are at
T
A
= +25NC.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
f
SW
= 200kHz to 600kHz, MAX16814A_ _
and MAX16814U_ _
Maximum Duty Cycle
f
SW
= 600kHz to 2000kHz, MAX16814A_ _
and MAX16814U_ _
f
SW
= 200kHz to 600kHz, MAX16814B_ _
f
SW
= 600kHz to 2000kHz, MAX16814B _ _ _
f
SW
= 200kHz to 2MHz, MAX16814A_ _
and MAX16814U_ _
f
SW
= 200kHz to 2MHz, MAX16814B_ _ _
MIN
85
82
90
86
-7.5
-7
4
1.1f
SW
60
Including leading-edge blanking time
Current ramp added to the CS input,
MAX16814A_ _ only
Current ramp added to the CS input,
MAX16814U_ _ and MAX16814B_ _ _
(Note 3)
10mV overdrive, excluding leading-edge
blanking time
44
45
396
90
49
50
416
10
1
g
M
(Note 4)
V
OUT_
= 5V, V
COMP
= 2.5V
V
OUT_
= 0V, V
COMP
= 2.5V
I
SINK
= 100mA (nMOS)
I
SOURCE
= 100mA (pMOS)
V
NDRV
= 5V
V
NDRV
= 0V
C
LOAD
= 1nF
C
LOAD
= 1nF
V
OUT_
= V
REF
I
OUT_
= 100mA
I
OUT_
= 100mA, all channels on
20
160
160
340
600
75
375
375
0.9
1.1
2.0
2.0
6
6
150
±2
±1.5
800
800
880
54
µA x f
SW
55
437
mV
ns
V
µS
dB
µA
µA
TYP
89
86
94
90
MAX
93
90
98
94
+7.5
+7
V
Hz
ns
ns
%
%
UNITS
Oscillator Frequency Accuracy
Sync Rising Threshold
Minimum Sync Frequency
PWM COMPARATOR
PWM Comparator Leading-Edge
Blanking Time
PWM to NDRV Propagation Delay
SLOPE COMPENSATION
Peak Slope Compensation
Current Ramp Magnitude
CS LIMIT COMPARATOR
Current-Limit Threshold
CS Limit Comparator to NDRV
Propagation Delay
ERROR AMPLIFIER
OUT_ Regulation Voltage
Transconductance
No-Load Gain
COMP Sink Current
COMP Source Current
MOSFET DRIVER
NDRV On-Resistance
Peak Sink Current
Peak Source Current
Rise Time
Fall Time
LED CURRENT SOURCES
OUT_ Current-Sink Range
Channel-to-Channel Matching
Maxim Integrated
ω
A
A
ns
ns
mA
%
3
MAX16814
Integrated, 4-Channel, High-Brightness LED
Driver with High-Voltage DC-DC Controller
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
EN
= 12V, R
RT
= 12.25kI, R
SETI
= 15kI, C
VCC
= 1FF, V
CC
= V
DRV
, NDRV = COMP = OUT_ = unconnected, V
RSDT
= V
DIM
= V
CC
, V
OVP
= V
CS
= V
LEDGND
= V
PGND
= V
SGND
= 0V, T
A
= T
J
= -40NC to +125NC for MAX16814A_ _, T
A
= -40NC to +85NC for
MAX16814BE_ _, and T
A
= T
J
= 0NC to +85NC for MAX16814U_ _ and MAX16814BU_ _, unless otherwise noted. Typical values are at
T
A
= +25NC.) (Note 2)
PARAMETER
SYMBOL
I
OUT_
=
100mA
CONDITIONS
T
A
= +125°C, MAX16814A_ _
only
T
A
= -40°C to +125°C,
MAX16814A_ _ only
T
A
= +25°C, MAX16814U_ _ and
MAX16814B_ _ _
MIN
TYP
MAX
±3
±5
±2.75
±4
±4
1
1.125
1.144
1.23
1.23
50
V
EN
= 40V
2.1
0.8
250
±2
DIM rising edge to 10% rise in I
OUT_
DIM falling edge to 10% fall in I
OUT
_
V
IN
= 4.75V and I
SINK
= 5mA
V
FLT
= 5.5V
Gain = 3V
1.75
2.0
6.5
±600
Output rising
V
OVP
= 1.25V
Temperature rising
165
15
1.19
1.228
70
±200
1.266
100
100
200
0.4
1.0
2.25
±600
1.335
1.316
V
mV
nA
V
V
mV
µA
ns
ns
ns
V
µA
V
µs
nA
V
mV
nA
°C
°C
µA
%
UNITS
Output Current Accuracy
I
OUT_
=
T
A
= 0°C to +85°C, MAX16814U_
50mA to
_ and MAX16814BU _ _
150mA
T
A
= -40°C to +85°C for
MAX16814BE _ _
OUT_ Leakage Current
LOGIC INPUTS/OUTPUTS
V
EN
rising, MAX16814A_ _ only
EN Reference Voltage
EN Hysteresis
EN Input Current
DIM Input High Voltage
DIM Input Low Voltage
DIM Hysteresis
DIM Input Current
DIM to LED Turn-On Delay
DIM to LED Turn-Off Delay
I
OUT_
Rise and Fall Times
FLT
Output Low Voltage
FLT
Output Leakage Current
LED Short Detection Threshold
Short Detection Comparator Delay
RSDT Leakage Current
OVP Trip Threshold
OVP Hysteresis
OVP Leakage Current
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
V
EN
rising, MAX16814U_ _ and
MAX16814B_ _ _
V
DIM
= 0V, V
OUT_
= 40V
Note 2:
All MAX16814A_ _ are 100% tested at T
A
= +125NC, while all MAX16814U_ _ and MAX16814B _ _ _ are 100% tested at
T
A
= +25°C. All limits overtemperature are guaranteed by design , not production tested.
Note 3:
CS threshold includes slope compensation ramp magnitude.
C++ 属于面向对象的编程语言，OOP的思想不必多说，特别对于复杂的软件工程来说，利用OOP绝对是事半功倍，相对于传统的C来说； 当然用C来写单片机程序无可厚非，已经延续了一个传统，从大学时学的开始到工作岗位，好多人都是一直用C来做，但是既然Keil支持C++编译， 可以用C++来编写你的代码，可以利用高级语言来结构化，清晰化你的程序，为嘛不用呢！哈哈，个人看法！下面进入正题： C+...[详细]
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