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8-String WLED Driver with Integrated Step-Up
Regulator and SMBus/PWM Dimming Capability
Low
SGND
Table 3. Operating Mode
EN DFSET
Direct PWM
(Standby)
SCL, SDA
X
0.8mA (typ, 0.4mA min) current source during 1ms (typ).
If some FB_ voltage is lower than 1.2V (max), the string is
considered to be unused. Therefore, when a string is not
in use, it should be connected to SGND. All other strings
with FB_ higher than 1.2V (max) are detected as in use.
Direct PWM
(Startup)
SMBus
(Standby)
SMBus
(Startup)
High
X
X
SGND
R DFSET
R DFSET
X
CLOCK
ENABLE
Command
After the LED string diagnostic phases are finished, the
step-up regulator starts. The total startup time is less
than 10ms.Figure 3 shows the sequence.
Standby and FAULT Shutdown
The MAX17105 can be placed into standby by EN =
low in direct-PWM mode or clearing bit 0 of the device
X = Don’t Care
At startup, there are three phases. The first phase is
p-channel MOSFET soft-start time, the second is check
LED time (1ms), and the last phase is boost soft-start
time (4ms). In the first phase, FAULT sink current is
increased from 0 F A to 50μA to avoid high inrush current
caused by the p-channel MOSFET turn-on. In check LED
time, the MAX17105 performs a diagnostic test of the
LED array. In the test phase, all FB_ are pulled up by
control register (0x01) in SMBus mode. When a critical
failure is detected, the IC enters fault shutdown mode.
In standby or fault shutdown mode, all functions of the
IC are turned off, including the 5V linear regulator. Only
a crude linear regulator remains on providing a 4.5V
(typ) output voltage to V CC , with 1 F A current sourcing
capability. The Fault/Status register is not reset in fault
shutdown. When bit 0 of the device control register
(0x01) is set to 1 in SMBus mode or cycling the EN pin,
the MAX17105 exits fault shutdown mode and starts. The
Fault/Status register is reset at startup.
V IN
0V
VOUT
0V
V FAULT
0V
I FAULT
0uA
V VCC
0V
Figure 3. MAX17105 Startup Timing Sequence
PFET
SOFT-START
CHECK LED
STEP-UP REGULATOR
SOFT-START
16
______________________________________________________________________________________
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