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BM2P063HK-LBZ Fiches technique(PDF) 8 Page - Rohm

No de pièce BM2P063HK-LBZ
Description  PWM Type DC/DC Converter IC Integrated Switching MOSFET
Download  23 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
Logo ROHM - Rohm

BM2P063HK-LBZ Fiches technique(HTML) 8 Page - Rohm

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www.rohm.com
BM2P063HK-LBZ BM2P103HK-LBZ BM2P133HK-LBZ
TSZ22111 • 15 • 001
TSZ02201-0F1F0A200670-1-2
06.Oct.2020 Rev.001
Description of Blocks – continued
5.
SOURCE Pin Short Protection
When the SOURCE pin is shorted to ground, the IC may overheat and get destroyed. To prevent destruction, it has a
built-in short protection function. Switching is turned off in tCSSHT (Typ = 2.0 µs) ON width when the status that the
SOURCE pin voltage is VCSSHT (Typ = 0.060 V) or less is detected by this function.
6.
Output Over Load Protection Function (FB OLP Comparator)
Output over load protection function monitors the load condition and stops switching operation when over load condition
is detected. The IC detects over load status at the FB pin voltage ≥ VFOLP1 (Typ = 3.30 V) and releases FB OLP at the FB
pin voltage ≤ VFOLP2 (Typ = 3.10 V). As output voltage decreases during over load condition and this condition continues
for tFOLP1 (Typ = 64 ms), over load condition is detected and switching operation stops. FB OLP detection will be
released after the auto-recovery period tFOLP2 (Typ = 512 ms).
7.
Input Voltage Protection Function (Brown IN/OUT)
This IC has the internal protection functions at the BR pin.
1) Over voltage protection function: BR pin OVP (Over Voltage Protection)
2) Under voltage protection function: BR pin UVLO (Under Voltage Lockout)
(1) BR OVP Function
BR OVP function monitors the input voltage through the BR pin and stops switching operation when over voltage
condition, it prevents destruction of built-in super junction MOSET. The BR pin capacitor must be connected to prevent
malfunction.
e.g. The case that BR OVP is operated when the input voltage is 309.4 Vac.
(������������1+������������2)������������������������1
������������2×√2
= 309.4
[Vac] It is 437.4 V by DC conversion.
When RBR1 is set to 3.91 MΩ, RBR2 is calculated to 27 kΩ. Then, BR OVP voltage is calculated as:
(������������1+������������2)������������������������2
������������2×√2
= 288.7
[Vac] It is 408.3 V by DC conversion.
Therefore, the hysteresis is 20.7 Vac.
RBR1
RBR2
Filter
Diode
Bridge
FUSE
GND
OUT
Figure 9. Brown IN/OUT Circuit Example
(2) BR UVLO Function
This IC has a built-in UVLO function that monitors the input voltage through the BR pin. It prevents the IC from heating
by over-current when the input voltage is low. When BR UVLO function is released, IC operates by soft start. BR pin
UVLO is decided uniquely by RBR1 and RBR2 that is defined in (1).
(������������1+������������2)������������1
������������2×√2
= 67.0
[Vac]
(������������1+������������2)������������2
������������2×√2
= 56.7
[Vac]
Therefore, the hysteresis is 10.3 Vac.


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