BM1051F Datasheet PDF - Rohm

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BM1051F
Rohm

Part Number BM1051F
Description Quasi-Resonant Control DC/DC converter and Power Factor Correction converter IC
Page 30 Pages


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Datasheet
Quasi-Resonant Control DC/DC
converter and Power Factor Correction
converter IC for AC/DC Converter
BM1051F
General Description
BM1051F is compounded LSI of Power Factor Correction
converter (PFC) for harmonic solution and DC/DC converter
(DC/DC). Because DC/DC operates on Quasi-resonant
method, DC/DC contributes to Low EMI.
BM1051F built in a HV starter circuit that tolerates 650V.
Because of putting the current sense resistors externally
both the PFC part and the DC/DC part, IC enables power
supply design free.
In the PFC part, IC adopts peak current control operation.
Suitable application is proposed by a various protection
circuit, such as the multiplier with a revision circuit on the AC
voltage falls, the load regulation revision circuit, and the
maximum power feed-forward circuit, etc.
The Quasi-resonant system of a DC/DC part contributes to
low EMI because PFC operates by soft switching.
A burst mode is built in, so the power is reduced at light load.
Various protection functions, such as a soft start function, a
burst function, an over-current limiting for every cycle,
overvoltage protection, and over current protection, are built
in. The pin for communicated control with a controller and the
external stop pin are prepared; it proposes the system that
can be adapted for various applications.
Basic specifications
Operating Power Supply Voltage Range:
VCC8.0 to 24.0V
Operating Current:
QR ON (PFC OFF)1.20mA(pulse on)
QR ON (PFC OFF)1.00mA(pulse off)
QR ON (PFC ON)1.80mA(pulse on)
Oscillation Frequency QR part :120kHz(FB=2.0V typ)
Operating Temperature: -40to +85
Typical Application Circuit(s)
+
AC
85-265Vac
-
FUSE
Filter
Diode
Bridge
P_OUT
P_CS
P_VS
VCC
QR_ZT
BD9212F
4Ch LEDドライバ
FET内蔵
DCDC 無し
DCD C
BD92XX
DC/DC
音声
QR_ZT QR_FB QR_CS
BM1051
VCC QR_CS
マイコン
P_VS
P_CS
P_OUT
QR_FB
Features
Quasi-resonant circuit + PFC circuit
Built-in HV Starter circuit
Low consumption current (typ.10uA) when starter
circuit is OFF.
Quasi resonant circuit
Max operating frequency(120kHz)
Frequency reduction function
Over-current limiting variable function
Pulse-by-pulse over-current protection circuit
Built-in Soft start
Voltage protection function (brown out) during low
input
ZT pin Over Voltage Protection
Output overload protection (auto recovery /latch
switching enabled)
250nsec Leading-Edge Blanking
Power Factor Correction circuit
Peak current control (65kHz)
Per-cycle over current protection circuit
Maximum power revision
the multiplier with a revision circuit when the AC
voltage falls
the load change measure circuit
Selectable protection method by LATCH/AUTOR
terminal.
LATCH/AUTOR=H : Latch
LATCH/AUTOR=L : Auto recovery
External stop function (COMP pin)
AC input voltage stop detected function (ACDET)
Built-in PFC stop terminal (PFCON/OFF)
Package(s)
SOP24 15.0mm×5.40mm ×1.80mm pitch1.27mm
(Typ.) (Typ.) (TYP.) TYP.
Applications
TV, AC adapters, printers, LED lighting
Figure 1. Application 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
1/47
TSZ02201-0F1F0A200020-1-2
10.Apr.2015 Rev.002

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BM1051F Quasi-Resonant Control DC/DC converter and Power Factor Correction converter IC BM1051F
Rohm
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