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PDF BM1P107FJ Data sheet ( Hoja de datos )

Número de pieza BM1P107FJ
Descripción PWM Control IC
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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Datasheet
AC/DC Drivers
PWM Control IC
BM1P107FJ
General
The PWM control IC for AC/DC “BM1P107FJ”
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:
BM1P107FJ: 100 kHz (Typ.)
Operating temperature range:
-40°C to +85°C
Application circuit
Features
PWM frequency: 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
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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

1 page




BM1P107FJ pdf
BM1P107FJ
Block Diagram
+
FUSE
-
Datasheet
8
STARTER
6
VCC OVP
13.5V
/ 8.2V
+
-
VCC UVLO
+
-
100us
Filter
27.5V
4.0V
Line Reg
Internal Block
12V Clamp
Circuit
S
RQ
DRIVER
5
PWM Control
4.0V
30k OLP
2 - 64ms
+ Filter
Burst
Comparator
-
+
Current
Limiter
+
-
Leading Edge
Blanking
(typ=250ns)
1M
3
PWM
Comparator
-
+
MAX
DUTY
OSC
+ ( 65kHz)
(100kHz)
Soft Start
AC Input
Compensation
Frequency
Hopping
Slope
Compensation
4
Figure 3. Block Diagram
FeedBack
With
Isolation
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
5/26
TSZ02201-0F2F0A200170-1-2
2.Oct.2013.Rev.001

5 Page





BM1P107FJ arduino
BM1P107FJ
(4) DC/DC driver (PWM comparator, frequency hopping, slope compensation, OSC, burst)
(4-1) PWM basic operations
Figure 13 shows a PWM basic block diagram and Figure 14 illustrates PWM basic operations.
Datasheet
Ip
Figure 13. Block Diagram of IC Internal PWM Operations
Figure 14. PWM Basic Operations
A: A SET signal is output from the oscillator in the IC, and the MOSFET is turned ON.
At that time, the capacitance between the MOSFET drain and source becomes discharged, and noise is
generated at the CS pin.
This noise is called the leading edge.
This IC has a built-in filter for this noise. (See (5).)
As a result of this filter and delay time, the minimum pulse width of the IC is 400 ns (typ).
Afterward, current flow to the MOSFET and the Vcs = Rs * Ip voltage is applied to the CS pin.
B: When CS pin voltage rises to become greater than the FB pin voltage/Gain (typ = 4) or the overcurrent detection
voltage Vcs, the RESET signal is output and OUT is turned off.
C: There is a delay time Tondelay between time point B and actual turn-off. This time is the result of differences in
maximum power that occur based on the AC voltage. This IC includes a function that suppresses these
differences. (See (4-4).)
D: The energy that accumulates in the transformer during Ton status is discharged to the secondary side, and the
drain voltage starts to oscillate freely based on the transformer Lp value and the MOSFET Cds (drain-source
capacitance).
E: Since the switching frequency within the IC is predetermined, SET signal output from the internal oscillator occurs
for a set period starting from point A, and the MOSFET is turned on.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
11/26
TSZ02201-0F2F0A200170-1-2
2.Oct.2013.Rev.001

11 Page







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