UPSRB04G-AF5-R [UTC]
HIGH PRECISION CC/CV PRIMARY SIDE SWITCHING REGULATOR;
| 型号： | UPSRB04G-AF5-R |
| 厂家： | 
Unisonic Technologies |
| 描述： | HIGH PRECISION CC/CV PRIMARY SIDE SWITCHING REGULATOR 开关 |
| 文件： | 总7页 (文件大小：173K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
UPSRB04
Preliminary
CMOS IC
HIGH PRECISION CC/CV
PRIMARY SIDE SWITCHING
REGULATOR
DESCRIPTION
The UTC UPSRB04 is a primary control unit for switch mode
charger and adapter applications. The controlled variable is
transferred by an auxiliary winding from the secondary to the
primary side. The device uses Pulse Frequency Modulation (PFM)
method to build discontinuous conduction mode (DCM) flyback
power supplies.
The UTC UPSRB04 operates in primary-side sensing and
regulation. Opto-coupler and TL431 could be eliminated. It also
eliminates the need of loop compensation circuitry while
maintaining stability.
The UTC UPSRB04 achieves high precision CV/CC regulation
and high power efficiency. It offers comprehensive protection
coverage with auto-recovery features including Cycle-by-cycle
current limiting, output over voltage protection, VDD over voltage
protection, feedback loop open protection, short circuit protection,
leading edge blanking, OTP, VDD under voltage lockout, etc.
FEATURES
* ±5% constant voltage regulation at universal AC input
* Primary side control without TL431 and opto-coupler
* High precision constant current regulation at universal AC input
* Programmable CV and CC regulation
* Built-in leading edge blanking
* Built-in primary winding inductance
compensation
* Open circuit protection
* Eliminates control loop compensation circuitry
* Flyback topology in DCM operation
* Random frequency modulation to reduce system EMI
* Driver BJT switch
* Output over voltage protection
* VDD over voltage protection
* Short circuit protection
* Over temperature protection
* Programmable cable drop compensation
ORDERING INFORMATION
Ordering Number
Package
SOT-25
Packing
Lead Free
Halogen Free
UPSRB04G-AF5-R
UPSRB04L-AF5-R
Tape Reel
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Copyright © 2018 Unisonic Technologies Co., Ltd
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UPSRB04
Preliminary
CMOS IC
MARKING
PIN CONFIGURATION
PIN DESCRIPTION
PIN NO.
PIN NAME
FB
DESCRIPTION
1
2
3
4
5
The voltage feedback from the auxiliary winding
Ground
GND
CS
Current sense input.
BD
Base drive for power BJT.
Power supply
VDD
BLOCK DIAGRAM
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UPSRB04
Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
-0.3 ~ 30
-0.3 ~ 7
UNIT
V
VDD Voltage
VDD
VC
VC Voltage
V
BASE Voltage
CS Input Voltage
FB Input Voltage
VBASE
VCS
VFB
-0.3 ~ 7
V
-0.3 ~ 7
V
-0.3 ~ 7
V
Junction Temperature
Storage Temperature
TJ
-40 ~ +150
-55 ~ +150
°C
°C
TSTG
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
ELECTRICAL CHARACTERISTICS (VDD=15V, TA=25°C, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Supply Voltage (VDD) Section
Start up Current
IST
VDD= VTH (ON)-1V
5
15
1
μA
mA
V
Static Current
IOP
0.72
7.1
19.4
28
Turn-off Threshold Voltage
Turn-on Threshold Voltage
VDD Over Voltage Protection
Operating Voltage
VTH(OFF)
VTH (ON)
VDD_OVP
6.5
7.8
20.4
29.5
26
18.4
26.5
V
V
V
Current Sense Input Section
LEB Time
TLEB
VTH_OCP_MIN
VTH_OCP_MAX
VCS_MINI
0.5
500
555
100
50
μS
mV
mV
mV
uS
Minimum Over Current threshold
Maximum Over Current threshold
Minimum CS threshold
Maximum TON Time
485
515
TON_MAX
OCP Propagation Delay
FB Input Section
TD_OC
100
nS
Reference Voltage for Feedback
Threshold
VFB
2.475
720
2.5
2.525
880
V
Minimum Pause
TPAUSE_MIN
F_MIN
2.0
μS
Minimum frequency
800
Hz
Maximum Cable Compensation
Current
ICABLE
48
μA
BASE Drive Section
Base Sourcing Maximum Current
Base Sourcing Current After Pre-off
Output Over Voltage Protection
Output over voltage threshold
On chip over temperature section
Over temperature protection trigger
point
IS_MAX
50
mA
mA
IS_PREOFF
1.5
V_OVP
2.85
3
3.15
V
T_OTP
165
130
°C
°C
Over temperature protection
recovery point
T_OTP_REC
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UPSRB04
Preliminary
CMOS IC
OPERATION DESCRIPTION
The UTC UPSRB04 is a primary control unit for switch mode charger and adapter applications. It operates in
primary-side sensing and regulation. Opto-coupler and TL431 could be eliminated. Proprietary built-in CV and CC
control can achieve high precision CV/CC performance. It uses Pulse Frequency Modulation (PFM) method to build
discontinuous conduction mode (DCM) flyback power supplies.
Startup control
The VDD pin of UTC UPSRB04 is connected to the line input through a resistor. A large value startup resistor can
be used to minimize the power loss in application because the start current of UTC UPSRB04 is very low. When the
VDD voltage reaches VTH (ON), the internal startup circuit is disabled and the IC turns on.
Operating Current
The Operating current of UTC UPSRB04 is as low as 720μA. Good efficiency and very low standby power can be
achieved.
Constant Voltage Operation
The output voltage is defined by the transmission ratio between the secondary and auxiliary winding. The UTC
UPSRB04 captures the auxiliary winding feedback voltage at FB pin and operates in constant-voltage (CV) mode to
regulate the output voltage. The auxiliary voltage reflects the output voltage is given by:
NA
VAUX
=
×ꢁVO + ∆Vꢀ
(1)
NS
Where ꢀV indicates the drop voltage of the output diode.
Figure2. Auxiliary voltage waveform
Via a resistor divider connected between the auxiliary winding and FB, the VAUX is sampled at the Tsampling end
and it is hold until the next sampling. The sampled voltage is compared with 2.5V reference voltage and the error is
amplified. The error amplifier output reflects the load condition and controls the Toff time to regulate the output
voltage, thus constant output voltage can be achieved.
Constant Current Operation
When the sampled voltage is below 2.5V reference voltage and the error amplifier output reaches its maximum,
thus UTC UPSRB04 operates in constant-current (CC) mode. The CC point and maximum output power can be
externally adjusted by external current sense resistor Rcs. The larger Rcs, the smaller CC point is, and the smaller
output power becomes.
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UPSRB04
Preliminary
CMOS IC
OPERATION DESCRIPTION (Cont.)
Figure3. Adjustable output power by changing RCS
Figure4. Secondary current waveform
In CC operation, the CC loop control function of UTC UPSRB04 will keep a fixed proportion between secondary
inductance de-magnetization time (Tdemag) and switching cycle time (Tsw). The fixed proportion is
Tdemag
1
2
=
(2)
TSW
Thus the output current is given by:
Tdemag
1
2
NP
NS
1
4
N
Iout
=
×
×IPK
×
=
×
P ×IPK
NS
(3)
TSW
Programmable Cable drop Compensation
UTC UPSRB04 has a built-in cable voltage drop compensation to achieve good load regulation. An offset voltage
is generated at FB pin by an internal current flowing into the resistor divider. The current is inversely proportional to
the output load current. The voltage drop across the cable is compensated by this offset voltage at FB pin. It can
also be programmed by adjusting the resistance of the divider to compensate the drop for various cable lines used.
Current Sensing and Leading Edge Blanking
Cycle-by-cycle current limiting is offered in UTC UPSRB04. The switch current is detected by a sense resistor into
the CS pin. When the power switch is turned on, a turn-on spike will occur on this resistor. A 500ns leading-edge
blanking is built in to avoid false-termination of the switching pulse so that the external RC filtering is no longer
needed.
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UPSRB04
Preliminary
CMOS IC
OPERATION DESCRIPTION (Cont.)
Drive BJT
The driver is a push pull stage with the supply voltage VDD. It provides the driving current for the external power
bipolar transistor. The output signal is current-limited to Is_max.
Protection Control
Good power supply system reliability is achieved with its comprehensive protection features including output
over-voltage protection, VDD over voltage protection, OTP, feedback loop open protection, Cycle-by-cycle current
limiting, short circuit protection, leading edge blanking and UVLO, etc.
VDD is supplied by transformer auxiliary winding output. The output of UTC UPSRB04 is shutdown when VDD drops
below VTH(OFF) and the power converter enters power on start-up sequence thereafter.
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UPSRB04
Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
L
IS
VO
D1
NS
N
NP
Co
NA
VDD
FB
Q1
BASE
UTC
UPSRB04
CS
GND
RCS
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all UTC products described or contained herein.
UTC products are not designed for use in life support appliances, devices or systems where malfunction
of these products can be reasonably expected to result in personal injury. Reproduction in whole or in
part is prohibited without the prior written consent of the copyright owner. UTC reserves the right to
make changes to information published in this document, including without limitation specifications and
product descriptions, at any time and without notice. This document supersedes and replaces all
information supplied prior to the publication hereof.
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