UPSRB02_16 [UTC]
HIGH PRECISION CC/CV PRIMARY SIDE SWITCHING REGULATOR;
| 型号： | UPSRB02_16 |
| 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：160K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
UPSRB02
Preliminary
LINEAR INTEGRATED CIRCUIT
HIGH PRECISION CC/CV
PRIMARY SIDE SWITCHING
REGULATOR
4
5
6
DESCRIPTION
3
2
The UTC UPSRB02 is a primary control unit for switch mode
1
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) and Pulse Width Modulation (PWM) method to build
discontinuous conduction mode (DCM) flyback power supplies.
The UTC UPSRB02 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.
SOT-26
The UTC UPSRB02 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
* Improved dynamic response
* Built-in leading edge blanking
* High precision constant current regulation at universal AC input * Built-in primary winding inductance
* Programmable CV and CC regulation
* Eliminates control loop compensation circuitry
* Flyback topology in DCM operation
* Random frequency modulation to reduce system EMI
* Driver BJT switch
compensation
* Open circuit protection
* Output over voltage protection
* VDD over voltage protection
* Short circuit protection
* Over temperature protection
* Programmable cable drop compensation
* Audio noise free operation
ORDERING INFORMATION
Ordering Number
Package
Packing
UPSRB02G-AG6-R
SOT-26
Tape Reel
UPSRB02G-AG6-R
(1)Packing Type
(1) R: Tape Reel
(2) AG6: SOT-26
(2)Package Type
(3)Green Package
(3) G: Halogen Free and Lead Freee
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Copyright © 2016 Unisonic Technologies Co., Ltd
QW-R103-079.b
UPSRB02
Preliminary
LINEAR INTEGRATED CIRCUIT
MARKING
PIN CONFIGURATION
PIN DESCRIPTION
PIN NO.
PIN NAME
VC
DESCRIPTION
1
2
3
4
5
6
Low pass filter capacitor for cable compensation
Current sense input.
CS
BASE
FB
Base drive power BJT.
The voltage feedback from auxiliary winding
Ground
GND
VDD
Power supply
BLOCK DIAGRAM
I_drive
Regulator
VDD
6
&Ref
Por
Base
drive
3
5
BASE
GND
Logic core
4V
OVP
+
-
+
-
CV
controller
4
+
-
FB
2V
0.4V
LEB
Tdemag
detector
CC
controller
CS
+
-
2
Drop
comp
Dynamic
response
0.5V
1
VC
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QW-R103-079.b
UPSRB02
Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
VDD
RATINGS
-0.3~30
-0.3~7
UNIT
V
VDD Voltage
VC Voltage
VC
V
BASE Voltage
CS Input Voltage
FB Input Voltage
VBASE
VCS
-0.3~7
V
-0.3~7
V
VFB
-0.3~7
V
Junction Temperature
TJ
-40~150
-55~150
260
°C
°C
°C
Storage Temperature
TSTG
TOPR
Lead Temperature (Soldering, 10 secs)
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 (TA=25°C, VDD=15V, if not otherwise noted)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP MAX UNIT
Supply Voltage (VDD) Section
Start up Current
IST
VDD=11V
1
3
μA
μA
V
Static Current
IOP
VDD=15V
400
6.8
12.5
27
500
7.6
13.5
29
Turn-off Threshold Voltage
Turn-on Threshold Voltage
VDD Over Voltage Protection
Operating Voltage
VTH(OFF)
VTH (ON)
VDD_OVP
6.0
11.5
25
V
V
25
V
Current Sense Input Section
LEB Time
TLEB
VCS
0.5
μs
Over Current Threshold
400
450
500
mV
From OCP Comparator to
Base Drive
OCP Propagation Delay
TD_OC
100
45
nS
Maximum Source Current to CS Pin
FB Input Section
ICS_MAX
41
49
μA
Reference Voltage for Feedback
Threshold
VFB
1.98
780
2.00
2.02
820
V
Minimum Pause
TPAUSE_MIN
TPAUSE_MAX
2.0
μs
μs
Maximum Pause
800
Maximum Cable Compensation
Current
ICABLE
27
μA
BASE Drive Section
Base Sourcing Maximum Current
Base Sourcing Current After Pre-off
Base Drive Low Side On Resistor
IOUT(SOURCE)
IOUT(PRE)
20
30
1
40
mA
mA
Ω
0.5
1.5
RDSON_L
1
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3 of 7
QW-R103-079.b
UPSRB02
Preliminary
LINEAR INTEGRATED CIRCUIT
OPERATION DESCRIPTION
The UTC UPSRB02 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) and Pulse Width
Modulation (PWM) method to build discontinuous conduction mode (DCM) flyback power supplies.
Startup control
The VDD pin of UTC UPSRB02 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 UPSRB02 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 UPSRB02 is as low as 400μA. 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
UPSRB02 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 2V 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 2V reference voltage and the error amplifier output reaches its maximum, thus
UTC UPSRB02 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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QW-R103-079.b
UPSRB02
Preliminary
LINEAR INTEGRATED CIRCUIT
OPERATION DESCRIPTION (Cont.)
Figure3. Adjustable output power by changing RCS
Figure4. Secondary current waveform
In CC operation, the CC loop control function of UTC UPSRB02 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)
(3)
TSW
Thus the output current is given by:
Tdemag
1
2
NP
NS
1
4
N
Iout
=
×
×IPK
×
=
×
P ×IPK
NS
TSW
Programmable Cable drop Compensation
UTC UPSRB02 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 voltage of VC pin. As a result, it 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.
Improve dynamic response
At light or no load, an internal current ICS is flowing into CS pin. The current ICS is inversely proportional to the
voltage of VC pin, the maximum current ICS is limited to ICS_max
.
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QW-R103-079.b
UPSRB02
Preliminary
LINEAR INTEGRATED CIRCUIT
OPERATION DESCRIPTION (Cont.)
At no load, the actual CS threshold is:
VCS_no_Load=0.5-(ICS_MAX)×Rd
Current Sensing and Leading Edge Blanking
(V)
Cycle-by-cycle current limiting is offered in UTC UPSRB02. 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.
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 IOUT(SOURCE)
.
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 UPSRB02 is shutdown when VDD drops
below VTH(OFF) and the power converter enters power on start-up sequence thereafter.
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QW-R103-079.b
UPSRB02
Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
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. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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QW-R103-079.b
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