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BM1P106FJ-E2 Datasheet(PDF) 8 Page - Rohm

Part # BM1P106FJ-E2
Description  PWM Control IC
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BM1P106FJ-E2 Datasheet(HTML) 8 Page - Rohm

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Datasheet
Datasheet
BM1P068FJ
TSZ02201-0F2F0A200190-1-2
24.Oct.2013.Rev.001
© 2013 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
(2) Startup sequences (soft start operation, light load operation, auto recovery operation during overload protection)
Startup sequences are shown in Figure 8.
See the sections below for detailed descriptions.
Figure 8. Startup Sequence Time Chart
A: Voltage is applied to the input voltage (VH) pin (pin 8).
B: The VCC pin (pin 6) voltage rises, and when VCC > VUVLO1 (13.5 V typ) this IC starts to operate.
When protection functions (VCC, CS, FB pin, temperature) are judged as normal, switching operation begins.
At this time, the VCC pin (pin 6) consumption current necessarily causes the VCC pin voltage to drop.
When VCC < VUVLO2 (8.2 V typ), switching operation stops by VCC UVLO function. For that, set VCC capacitor to finish
start-up before VCC<V
UVLO2(8.2V.typ)
C: With the soft start function, excessive rises in voltage and current are prevented by adjusting the voltage level of the CS
pin (pin 3). During a soft start, the IC changes the overcurrent detection voltage from VCC_SS1 to VCC_SS4 to prevent
overshoot of the output voltage. VCC_SS1 is described in Table 2 below.
Table 2 Overcurrent Detection Voltage at Startup
D: When the switching operation starts, the secondary output voltage VOUT rises.
After switching has started, set the output voltage to within TFOLP (64 ms typ) to become the rated voltage.
E: When there is a light load, burst operation suppresses power consumption.
F: When there is an overload, the FB pin (pin 2) voltage becomes greater than VFOLP1A
to reduce the output voltage.
G: If the FB pin (pin 2) voltage exceeds VFOLP1A for TFOLP (64 ms typ) or longer, the overload protection circuit stops the
switching operation. For that, set to finish the start-up time within TFOLP (64 ms typ).
When the FB pin (pin 2) voltage exceeds VFOLP1B, the IC’s internal timer TFOLP (64 ms typ) is reset.
H: When VCC voltage becomes VCC < VUVLO2
(8.2 V typ), the start circuit operates and VCC charging is started.
I: When VCC voltage becomes VCC> VUVLO1 (13.5 V typ), the start circuit stops charging VCC.
J: Same as F
K: Same as G
Startup waveforms are shown as reference examples in Figure 9 and Figure 10.
Soft start
Vlim1
Start ~  0.5 ms
0.10 V (12%)
0.5 ms  ~1 ms
0.15 V (25%)
1 ms  ~2 ms
0.20 V (50%)
2 ms  ~ 4 ms
0.30 V (75%)
4 ms ~
0.500 V (100%)


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