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Low-Cost, 6-String WLED Drivers with
Quick-PWM Step-Up Converter
f s =
1 V IN ? I IN × R DSON
Theactualswitchingfrequencycanbeapproximatedby:
×
T OFF V OVP + V D ? I IN × R DSON
where:
V D is the forward voltage of the output diode.
R DSON is the on-resistance of the internal MOSFET.
The switching frequency is adjustable by changing the
off-time at each supply turn-on cycle. As mentioned
above, it is implemented by changing the voltage level
of the FSEL pin.
High-frequency operation optimizes the regulator for the
smallest component size at the expense of efficiency
V IN
due to increased switching losses. Low-frequency oper-
ation offers the best overall efficiency but requires larger
components and PCB area.
Input Supply Voltage Configuration and
UVLO
The devices include an internal low-dropout linear
regulator (V CC ) and are disabled until V CC exceeds the
UVLO threshold. The hysteresis on UVLO is approxi-
mately 100mV. When V IN is higher than 6V with EN high,
this linear regulator generates a 3.8V supply to power
the internal PWM controller, control logic, and MOSFET
driver. The V CC voltage drops to 0V with EN low. When
the V CC and IN pins are connected together, the devices
can operate in a low input-voltage range from 3V to 5.5V.
EN
IN
FSEL
ON- /OFF-TIME
LX
OVP
CALCULATION
OVP
SOFT-START
SS
ONE-SHOT
ERROR
COMPARATOR
REF
MAX17129
MAX17149
REF
INT
CURRENT
SENSE
INTEGRATOR
FB
Figure 4. MAX17129/MAX17149 Quick-PWM Control Functional Diagram
14
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