MAX16801A 查看數據表（PDF） - Maxim Integrated
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MAX16801A Datasheet PDF : 16 Pages
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Offline and DC-DC PWM Controllers for
High-Brightness LED Drivers
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +12V (MAX16801: VIN must first be brought up to +23.6V for startup), 10nF bypass capacitors at IN and VCC, CNDRV = 0µF,
VUVLO = +1.4V, VDIM/FB = +1.0V, COMP = unconnected, VCS = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are
at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CURRENT-SENSE COMPARATOR
Current-Sense Trip Threshold
VCS
CS Input Bias Current
ICS
Propagation Delay From
Comparator Input to NDRV
tPWM
Switching Frequency
fSW
Maximum Duty Cycle
DMAX
IN CLAMP VOLTAGE
IN Clamp Voltage
ERROR AMPLIFIER
Voltage Gain
Unity-Gain Bandwidth
Phase Margin
DIM/FB Input Offset Voltage
VINC
COMP Clamp Voltage
Source Current
Sink Current
Reference Voltage
Input Bias Current
COMP Short-Circuit Current
THERMAL SHUTDOWN
Thermal-Shutdown Temperature
Thermal Hysteresis
DIGITAL SOFT-START
VREF
CONDITIONS
VCS = 0V
50mV overdrive
MAX1680_A
MAX1680_B
2mA sink current, MAX16801 only (Note 3)
RLOAD = 100kΩ
RLOAD = 100kΩ, CLOAD = 200pF
RLOAD = 100kΩ, CLOAD = 200pF
High
Low
(Note 2)
Soft-Start Duration
MIN TYP MAX UNITS
262
291
320
mV
-2
+2
µA
60
ns
230 262
290
kHz
50
50.5
%
75
76
24.1 26.1 29.0
V
2.2
0.4
0.5
0.5
1.218
80
2
65
1.230
8
3
3.5
1.1
1.242
50
dB
MHz
Degrees
mV
V
mA
mA
V
nA
mA
130
°C
25
°C
15,872
Clock
cycles
Reference Voltage Steps During
Soft-Start
Reference Voltage Step
31
Steps
40
mV
Note 1: All devices are 100% tested at TA = +85°C. All limits over temperature are guaranteed by characterization.
Note 2: VREF is measured with DIM/FB connected to the COMP pin (see the Functional Diagram).
Note 3: The MAX16801 is intended for use in universal input offline drivers. The internal clamp circuit is used to prevent the boot-
strap capacitor (C1 in Figure 5) from charging to a voltage beyond the absolute maximum rating of the device when
EN/UVLO is low. The maximum current to IN (hence to clamp) when UVLO is low (device in shutdown), must be externally
limited to 2mA (max). Clamp currents higher than 2mA may result in clamp voltage higher than +30V, thus exceeding the
absolute maximum rating for IN. For the MAX16802, do not exceed the +24V maximum operating voltage of the device.
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