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Offline and DC-DC PWM Controllers for
High-Brightness LED Drivers
ELECTRICAL CHARACTERISTICS (continued)
(V IN = +12V (MAX16801: V IN must first be brought up to +23.6V for startup), 10nF bypass capacitors at IN and V CC , C NDRV = 0μF,
V UVLO = +1.4V, V DIM/FB = +1.0V, COMP = unconnected, V CS = 0V, T A = -40°C to +85°C, unless otherwise noted. Typical values are
at T A = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CURRENT-SENSE COMPARATOR
Current-Sense Trip Threshold
V CS
262
291
320
mV
CS Input Bias Current
Propagation Delay From
Comparator Input to NDRV
I CS
t PWM
V CS = 0V
50mV overdrive
-2
60
+2
μA
ns
Switching Frequency
Maximum Duty Cycle
f SW
D MAX
MAX1680_A
MAX1680_B
230
262
50
75
290
50.5
76
kHz
%
IN CLAMP VOLTAGE
IN Clamp Voltage
V INC
2mA sink current, MAX16801 only (Note 3)
24.1
26.1
29.0
V
ERROR AMPLIFIER
Voltage Gain
Unity-Gain Bandwidth
Phase Margin
DIM/FB Input Offset Voltage
R LOAD = 100k ?
R LOAD = 100k ? , C LOAD = 200pF
R LOAD = 100k ? , C LOAD = 200pF
80
2
65
3
dB
MHz
Degrees
mV
COMP Clamp Voltage
Source Current
Sink Current
High
Low
2.2
0.4
0.5
0.5
3.5
1.1
V
mA
mA
Reference Voltage
V REF
(Note 2)
1.218
1.230
1.242
V
Input Bias Current
COMP Short-Circuit Current
THERMAL SHUTDOWN
Thermal-Shutdown Temperature
Thermal Hysteresis
DIGITAL SOFT-START
Soft-Start Duration
Reference Voltage Steps During
Soft-Start
Reference Voltage Step
8
130
25
15,872
31
40
50
nA
mA
°C
°C
Clock
cycles
Steps
mV
Note 1: All devices are 100% tested at T A = +85°C. All limits over temperature are guaranteed by characterization.
Note 2: V REF 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.
_______________________________________________________________________________________
3
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