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NXP Semiconductors
SSL3250A
Photo flash dual LED driver
8.4.4 Short circuit protection
To prevent device and battery overloading, the converter is short circuit protected. In case
the LED pin is shorted to GND due to an application failure, the switching of the converter
is inhibited. Typical response times between detection of the LED pin shorted to GND and
inhibit switching of the converter is less than 1 ms. The short circuit protection is functional
at any time during Torch mode and also during the soft start phase of the flash period.
The short circuit protection may also be triggered when either the inductor or the diode is
not connected. Also, a shorted diode may trigger the output short protection, if two LEDs
are connected in series between VO and LED pins. Therefore little or no current will flow
through the LEDs or into the LED pin and V LED will stay almost at GND level.
When an overvoltage is encountered, the OS_PROT flag (bit 3) is set in the status
register.
Remark: If V BAT is HIGH and only one White LED is connected between VO and LED
pins, the Schottky diode may be irreversibly damaged when the LED pin is shorted. This
is inherent to the asynchronous boost converter topology.
8.4.5 Interrupt line
The interrupt pin INT is an active LOW open-drain output allowing for multiple devices to
be connected as a wired OR, using the same interrupt line to the external control logic. On
the interrupt line, only one pull-up resistor is needed in the complete system.
8.4.6 Undervoltage lockout
As a result of a low battery voltage, the input voltage can drop too low to guarantee normal
operation. When the input voltage has dropped below the undervoltage lockout level, the
device switches to an undervoltage lockout state stopping all operations of the device.
Start-up is only possible by crossing the start-up level again. Recovering from this error
results in the loss of all register settings. This protection does not generate an interrupt on
the INT line nor is it flagged in the status register 03h.
8.5 Soft start
To avoid battery overloading when entering the Torch mode or the Flash mode, the device
is equipped with a soft start circuit. This circuit limits the rate of rise of the LED current to
4.5 mA/ μ s until the required LED current has been reached. When the device ends Flash
mode or Torch mode, the LED current decreases with a controlled slope of 9 mA/ μ s.
Whenever a protection is activated, the LED current decreases without the controlled
slope and drops immediately to zero.
8.6 Peak current limit
To avoid saturation of the inductor, the device is equipped with a peak current limit
function. This circuit limits the peak inductor currents to 2.2 A. No protection is activated.
8.7 I 2 C-bus protocol
The I 2 C interface is a 2-wire serial interface developed by NXP Semiconductors to
communicate between different ICs or modules. The two wires are an SDA wire and an
SCL wire. Both lines must be connected to a positive supply via a pull-up resistor when
SSL3250A_5
? NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 16 December 2009
14 of 26
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