MAX16838B Datasheet, PDF (3/21 Pages) Maxim Integrated Products – Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller

MAX16838B
Integrated, 2-Channel, High-Brightness LED Driver
with High-Voltage Boost and SEPIC Controller
Electrical Characteristics (continued)
(V_IN = V_EN = 12V, R_RT = 12.2kΩ, R_ISET = 15kΩ, C_VCC = 1µF, V_CC = V_DRV = V_CFB, DRAIN, COMP, OUT_, FLT = unconnected, V_OV
= V_CS = V_LEDGND = V_DIM = V_PGND = V_SGND = 0V, V_GATE = V_NDRV, T_A = T_J = -40ºC to +125°C, unless otherwise noted. Typical
values are at T_A = 25°C.) (Note 2)
PARAMETER
RT OSCILLATOR
Switching Frequency Range
Duty Cycle
Oscillator Frequency Accuracy
Logic-Level Before SYNC
Capacitor
SYMBOL
CONDITIONS
f_SW
D_MAX
f_SW = 200kHz to 600kHz
f_SW = 600kHz to 2MHz
f_SW = 200kHz to 2MHz
MIN TYP MAX UNITS
200
2000 kHz
90
94
98
%
86
90
94
%
-7.5
+7.5
%
4
V
Synchronization Pulse Width
100
ns
SYNC Frequency Range
f_SYNC
PWM COMPARATOR
Leading-Edge Blanking
Propagation Delay to NDRV
SLOPE COMPENSATION
Slope Compensation Peak Voltage
per Cycle
CS LIMIT COMPARATOR
CS Threshold Voltage
CS Limit Comparator Propagation
Delay to NDRV
V_{CS_MAX}
CS Input Current
I_CS
ERROR AMPLIFIER
OUT_ Regulation Voltage
Transconductance
Gm
No-Load Gain
A
COMP Sink Current
COMP Source Current
MOSFET DRIVER
I_SINK
I_SOURCE
NDRV On-Resistance
POWER MOSFET
Power Switch On-Resistance
Switch Leakage Current
Switch Gate Charge
Including leading-edge blanking time
Voltage ramp added to CS
V_COMP = 3V
10mV overdrive (including leading-edge
blanking time)
0 ≤ V_CS ≤ 0.35V
V_DIM = 5V
(Note 4)
V_DIM = V_{OUT_} = 5V, V_COMP = 3V
V_DIM = 5V, V_{OUT_} = V_COMP = 0V
I_SINK = 100mA, V_IN > 5.5V
I_SOURCE = 100mA, V_IN > 5.5V
I_SWITCH = 0.5A, V_GS = 5V
V_DRAIN = 40V, V_GATE = 0V
V_DRAIN = 40V, V_GS = 4.5V
1.1 x
f_SW
1.5 x
f_SW
Hz
66
ns
100
ns
0.12
V
285
300
315
mV
100
ns
-1.3
+0.5
µA
0.9
1
1.1
V
340
600
880
µS
50
dB
400
800
µA
400
800
µA
1.5
4
Ω
1.5
4
Ω
0.15 0.35
Ω
0.003 1.2
µA
3.1
nC
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