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BM1P065FJ Schematic ( PDF Datasheet ) - ROHM Semiconductor

Teilenummer BM1P065FJ
Beschreibung PWM Control IC
Hersteller ROHM Semiconductor
Logo ROHM Semiconductor Logo 




Gesamt 30 Seiten
BM1P065FJ Datasheet, Funktion
Datasheet
AC/DC Drivers
PWM Control IC
BM1P065FJ
General
The PWM control IC for AC/DC “BM1P065FJ”
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:
BM1P065FJ: 65 kHz (Typ.)
Operating temperature range:
-40°C to +85°C
Application circuit
Features
PWM frequency: 65 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
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
×
×
×
×
×
×
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×
Figure 1Application Circuit
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
1/27
TSZ02201-0F2F0A200170-1-2
2.Oct.2013.Rev.001






BM1P065FJ Datasheet, Funktion
BM1P065FJ
Datasheet
Description of application operations in blocks
(1) Start circuit (VH pin: 8 pin)
This IC has a built-in start circuit (withstands 650 V). This enables both low standby mode power and high-speed
startup.
This start circuit operates only at startup. The current flow when operating is shown in Figure 5.
After startup, the power consumed is only for the idling current ISTART3 (typ = 10 uA).
ex) When Vac = 100 V, power consumption is from start circuit only
PVH = 100 V*2*10 uA = 1.41 mW
ex) When Vac = 240 V, power consumption is from start circuit only
PVH = 240 V*2*10 uA = 3.38 mW
Startup time is determined based on the inflow current for the VH pin and the capacitance for the VCC pin.
Startup time reference values are shown in Figure 6. For example, when Cvcc = 10 uF, startup takes about 0.07 seconds.
When the VCC pin has been shorted to GND, the ISTART1 current in Figure 5 flows.
When the VH pin has been shorted to GND, a large current flows to GND from the VH line. To prevent this, insert resistor
RVH (5 k~ 60 k) to limit the current between the VH line and the VH pin of the IC.
When the VH pin is shorted, the power of VH2/RVH is applied to the resistor. Therefore, select a resistor size that is able
to tolerate this amount of power.
If one resistor is not enough for the allowable power, connect two or more resistors in series.
Figure 4. Block Diagram of Start Circuit
Figure 5. Start Current vs VCC Voltage
(* Start current flows from the VH pin.)
The operating waveform at startup is as follows.
1.0 
0.9 
0.8 
0.7 
0.6 
0.5 
0.4 
0.3 
0.2 
0.1 
0.0 
0
5 10 15 20 25 30 35 40 45 50
Cvcc  [uF]
Figure 6. Startup Time (Reference Value)
(CVCC is capacitance for the VCC pin.)
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
6/27
TSZ02201-0F2F0A200170-1-2
2.Oct.2013.Rev.001

6 Page









BM1P065FJ pdf, datenblatt
BM1P065FJ
(5) DC/DC driver (PWM comparator, frequency hopping, slope compensation, OSC, burst)
(5-1) PWM basic operations
Figure 15 shows a PWM basic block diagram and Figure 16 illustrates PWM basic operations.
Datasheet
Ip
Figure 15. Block Diagram of IC Internal PWM Operations
Figure 16. 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 (6).)
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 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 results from differences in
maximum power that occur based on the AC voltage. This IC includes a function that suppresses these
differences. (See (5-4).)
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
12/27
TSZ02201-0F2F0A200170-1-2
2.Oct.2013.Rev.001

12 Page





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