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BD6592MUV
Datasheet
● Description of Functions
1) PWM current mode DC/DC converter
While BD6592MUV is power ON, the lowest voltage of LED1, 2, 3, 4, 5, 6 is detected, PWM duty is decided to be 0.5V
and output voltage is kept invariably. As for the inputs of the PWM comparator as the feature of the PWM current mode,
one is overlapped with error components from the error amplifier, and the other is overlapped with a current sense signal
that controls the inductor current into Slope waveform to prevent sub harmonic oscillation. This output controls external
Nch Tr via the RS latch. In the period where external Nch Tr gate is ON, energy is accumulated in the external inductor,
and in the period where external Nch Tr gate is OFF, energy is transferred to the output capacitor via external SBD.
BD6592MUV has many safety functions, and their detection signals stop switching operation at once.
2) Soft start
BD6592MUV has soft start function.
The soft start function prevents large coil current.
Rush current at turning on is prevented by the soft start function.
After RSTB is changed L ? H, when PWMPOW is changed L ? H, soft start becomes effective for within 1ms and soft
start doesn't become effective even if PWMPOW is changed L ? H after that.
And, when the H section of PWMPOW is within 1ms, soft start becomes invalid when PWMPOW is input to H more than
three times. The invalid of the soft start can be canceled by making RSTB ? L.
3) FAILSEL pin
When the error condition occurs, boost operating is stopped by the protection function, and the error condition is avoided.
On that occasion, the way to stop of boost operating by the protection function can be selected with FAILSEL pin. Details
are as shown in Figure 31, Figure 32.
After power ON, when the protection function is operating under about 1ms have passed, the stop state of the boost
operating can be held through FAILSEL is H, the stop state can reset through RSTB is L.
And, boost operating is stopped when the protection function is operating through FAILSEL is L, but when the protection
function becomes un-detect, boost operating is started again. It never keeps holding the stop state of boost operating.
In PWM control by PWMDRV can’t use this function.
When it is off over 10ms on PWM control by PWMPOW using this function, it may be stopped the boost
operating as over current protection work at off on PWMPOW=L.
Object of protect function is as shown below.
? Over-voltage protection
? External SBD open detect
? Thermal shutdown
? LED terminal over-voltage protection
? Over current limit
< When it is off on PWMPOW>
<FAILSEL=H>
RSTB
RSTB
PWMDRV
FAILSEL
“H”
about 1ms
un-operating range
PWMPOW
Output
voltage
Protection
function
un-detection
detection
un-detection
Coil current
Boost
operating
off
normal operating
boost stop
off
normal operating
FAILSEL
function
invalid
valid
<FAILSEL=L>
RSTB
about 1ms
< When it is off on RSTB>
RSTB
PWMDRV
FAILSEL
“L”
un-operating range
PWMPOW
Output
Protection
function
un-detectio
detection
un-detection
voltage
Coil current
Boost
operating
off
normal operating
boost stop
normal
operating
off
normal
FAILSEL
function
invalid
Figure 31. FAILSEL operating description
Figure 32. FAILSEL=H light off control
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
12 / 31
TSZ02201-0G3G0C400210-1-2
21.Dec.2012 Rev.001
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