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PDF ( 数据手册 , 数据表 ) BM1P067FJ

零件编号 BM1P067FJ
描述 PWM Control IC
制造商 ROHM Semiconductor
LOGO ROHM Semiconductor LOGO 


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BM1P067FJ 数据手册, 描述, 功能
Datasheet
AC/DC Drivers
PWM Control IC
BM1P067FJ
General
The PWM control IC for AC/DC “BM1P067FJ”
provides an optimum system for all products that
include an electrical outlet.
A built-in start circuit that withstands 650 V helps to
keep power consumption low. Both isolated and
non-isolated versions are supported, making for
simpler design of various types of low-power
converters. Switching MOSFET and current detection
resistors are external devices, thus achieving a higher
degree of freedom in power supply design. The
switching frequency is set as fixed. Since current mode
control is used, a current limit is imposed in each cycle,
and excellent performance is demonstrated in
bandwidth and transient response. With a light load,
frequency is reduced and higher efficiency is realized.
A frequency hopping function is also built in,
contributing to low EMI.
Also on chip are soft start and burst functions, a
per-cycle overcurrent limiter, VCC overvoltage
protection, overload protection, and other protection
functions.
Basic Specifications
Operating power supply voltage range: VCC 8.9 V to 26.0 V
VH: to 600 V
Operating current:
Normal: 0.60 mA (Typ.)
Burst mode: 0.35 mA (Typ.)
Oscillation frequency:
BM1P067FJ: 65 kHz (Typ.)
Operating temperature range:
-40°C to +85°C
Application circuit
Features
PWM frequency: 65 kHz, 100 kHz
PWM current mode method
Frequency hopping function
Burst operation during light load / Frequency
reduction function
650 V start circuit
VCC pin undervoltage protection
VCC pin overvoltage protection
CS pin open protection
CS pin Leading-Edge-Blanking function
Per-cycle overcurrent limiter function
Overcurrent limiter with AC voltage compensation
function
Soft start function
Secondary overcurrent protection circuit
Package
SOP-J8
4.90 mm × 6.00 mm × 1.65 mm pitch 1.27 mm
(Typ.)
(Typ.) (Typ.)
(Typ.)
Applications
AC adapters, TVs, and household appliances
(vacuum cleaners, humidifiers, air cleaners, air
conditioners, IH cooking heaters, rice cookers, etc.)
Line-up
Figure 1Application Circuit
Frequency VCCOVP VCC recharge
BM1P061FJ
BM1P062FJ
BM1P063FJ
BM1P064FJ
BM1P065FJ
BM1P066FJ
BM1P067FJ
BM1P068FJ
BM1P101FJ
BM1P102FJ
BM1P103FJ
BM1P104FJ
BM1P105FJ
BM1P106FJ
BM1P107FJ
BM1P108FJ
65kHz
65kHz
65kHz
65kHz
65kHz
65kHz
65kHz
65kHz
100kHz
100kHz
100kHz
100kHz
100kHz
100kHz
100kHz
100kHz
Auto-restart
Latch
Auto-restart
Latch
Auto-restart
Latch
Auto-restart
Latch
Auto-restart
Latch
Auto-restart
Latch
Auto-restart
Latch
Auto-restart
Latch
×
×
×
×
×
×
×
×
X-cap
discharge
×
×
×
×
×
×
×
×
×
×
×
×
Brown-out
×
×
×
×
×
×
×
×
Product structureSilicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product is not designed for protection against radioactive rays
1/26
TSZ02201-0F2F0A200170-1-2
2.Oct.2013.Rev.001







BM1P067FJ pdf, 数据表
BM1P067FJ
Datasheet
(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<VUVLO2(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
Soft start
Vlim1
Start ~  0.5 ms
0.10 V (12%)
0.5 ms  ~1 ms
1 ms  ~2 ms
2 ms  ~ 4 ms
0.15 V (25%)
0.20 V (50%)
0.30 V (75%)
4 ms ~
0.500 V (100%)
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 V ,FOLP1B 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.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
8/26
TSZ02201-0F2F0A200170-1-2
2.Oct.2013.Rev.001







BM1P067FJ equivalent, schematic
BM1P067FJ
Datasheet
(7) Output overload protection function (FB OLP comparator)
As is shown in mode4 of Figure 17, when the FB pin voltage rises to above a certain value, it is called an overload
condition.
The output overload protection function stops switching operations when mode4 has an overload condition.
During an overload condition, the output voltage drops and so current no longer flows to the photo coupler while the FB
voltage (pin 2) rises.
When the FB voltage (pin 2) exceeds VFOLP1A (2.8 V typ) continuously for TFOLP2 (64 ms typ), it is judged as an overload
condition and switching is stopped.
While the FB pin (pin 2) exceeds VFOLP1A (2.8 V typ), if the FB pin (pin 2) voltage drops below VFOLP1B (2.6 V typ) during the
TFOLP (64 ms typ) period, the overload protection timer is reset. Switching operation are performed during the TFOLP (64
ms typ) period. At startup, the FB pin (pin 2) voltage is pulled up by a resistance to the IC internal voltage, and operations
start when the voltage reaches VFOLP1A (2.8 V typ) or above. Therefore, at startup the start time of secondary output
voltage must be set so that the FB voltage (pin 2) drops to VFOLP1B (2.6 V typ) or below within the TFOLP (64 ms typ) period.
Once FBOLP is detected, the switching operation stops, and VCC voltage falls down because secondary output voltage
falls down. When VCC voltage is lower than Vuvlo2(8.2V.typ), IC is reset, and IC starts by starter circuit shown in (1).
The switching stop time is calculated by VCC pin voltage and VCC capacitor and Icc current
Stop time : Tstop Tstop=Cvcc*(VCC Vuvlo2) / Icc
Figure 24. Overload Protection (Auto Recovery)
A: Since FB > V ,FOLP1A the FBOLP comparator detects an overload.
B: When FB<VFOLP1B within TFOLPtyp=64msperiod, FB overload detection is released, and FBOLP timer is reset.
C: Since FB > V ,FOLP1A the FBOLP comparator detects an overload.
D: When the condition at C continues for TFOLP (typ = 64 ms), switching is stopped by the overload protection function.
As switching operation stops, VCC pin voltage falls down because output voltage falls down.
E: When VCC pin voltage < VUVLO2, IC is reset by VCC UVLO function, and start-up circuit operates.
F: When VCC pin voltage > VUVLO1, VCC UVLO is released, and switching operation starts.
G: Because secondary output voltage is stable, VCC pin voltage is also stable.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
16/26
TSZ02201-0F2F0A200170-1-2
2.Oct.2013.Rev.001










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