UPSR100L-S08-T [UTC]
Switching Regulator, CMOS, PDSO8, SOP-8;
| 型号： | UPSR100L-S08-T |
| 厂家： | 
Unisonic Technologies |
| 描述： | Switching Regulator, CMOS, PDSO8, SOP-8 开关 光电二极管 |
| 文件： | 总6页 (文件大小：165K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
UPSR100
Preliminary
CMOS IC
HIGH PRECISION CC/CV
PRIMARY SIDE REGULATOR
DESCRIPTION
The UTC UPSR100 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.
SOP-8
The UTC UPSR100 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 UPSR100 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, feedback loop open
protection, short circuit protection, leading edge blanking, VCC
under voltage lockout, etc.
FEATURES
* Driver BJT switch
* ±5% constant voltage regulation at universal AC input
* High precision constant current regulation at universal AC input
* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Eliminates control loop compensation circuitry
* Flyback topology in DCM operation
* Built-in leading edge blanking
* Built-in primary winding inductance
compensation
* Open circuit protection
* Over voltage protection
* Short circuit protection
* Random frequency modulation to reduce system EMI
ORDERING INFORMATION
Ordering Number
Lead Free
Package
Packing
Halogen Free
UPSR100L-S08-T
UPSR100L-S08-R
UPSR100G-S08-T
UPSR100G-S08-R
SOP-8
SOP-8
Tube
Tape Reel
UPSR100L-S08-R
(1)Packing Type
(1) T: Tube, R: Tape Reel
(2) S08: SOP-8
(2)Package Type
(3)Halogen Free
(3) L: Lead Free, G: Halogen Free
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Copyright © 2013 Unisonic Technologies Co., Ltd
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UPSR100
Preliminary
CMOS IC
PIN CONFIGURATION
PIN DESCRIPTION
PIN NO.
PIN NAME
CS
DESCRIPTION
1
2
3
4
5
6
7
8
Current sense input.
Power supply.
VCC
OUT
GND
FB
Base drive for power BJT.
Ground.
The voltage feedback from the auxiliary winding
The 5V output of the internal voltage regulator
VDD
BIAS
COMP
This pin sets the bias current inside UTC UPSR100 with an external resistor to GND
This pin connects a bypass capacitor
BLOCK DIAGRAM
VDD
6
BIAS
7
5V
Ibias
IREF
Por
Regulator
& VREF
2
VCC
Base
drive
Logic core
8V
3
1
OUT
CS
OVP
+
-
+
-
CV
controller
5
+
-
FB
0.43V
4V
LEB
Tdemag
detector
CC
controller
+
-
0.5V
4
8
COMP
GND
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UPSR100
Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
VCC
RATINGS
-0.3~30
-0.3~7
UNIT
V
Supply Voltage
Voltage at CS, BIAS, OUT, VDD, COMP to GND
FB Input (Pin 5)
V
-40~10
V
ESD (Machine Model)
200
V
Output Current at OUT
Internally limited
0.657
A
Power Dissipation at TA=25°C
Operating Junction Temperature
Storage Temperature
PD
TJ
W
°C
°C
150
TSTG
-65~150
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.
THERMAL DATA
DESCRIPTION
Junction to Ambient
SYMBOL
RATINGS
190
UNIT
°C/W
θJA
ELECTRICAL CHARACTERISTICS (VCC=15V, TA=25°C, unless otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP MAX UNIT
UVLO SECTION
Turn-on Threshold Voltage
Turn-off Threshold Voltage
REFERENCE VOLTAGE SECTION
BIAS Pin Voltage
VTH (ON)
VTH(OFF)
17.5
6.5
19
20.5
8.5
V
V
7.5
VBIAS
VDD
RBIAS=200kΩ, Before Turn on
1.15
4.75
1.20 1.25
5.0 5.25
V
V
VDD Pin Voltage
STANDBY CURRENT SECTION
Start-up Current
IST
RBIAS=200kΩ, Before Turn on
RBIAS=200kΩ
90
110
µA
µA
Operating Current
IOP
500 700
DRIVE OUTPUT SECTION
IOUT(SINK)
OUT Maximum Current
IOUT(SOURCE)
RBIAS=200kΩ,VOUT<0.2V
50
30
mA
mA
IOUT
RBIAS=200kΩ
40
CURRENT SENSE SECTION
Current Sense Threshold
Pre-Current Sense
VCS
505
455
520 545
480 505
460
mV
mV
ns
VCS(PRE)
Leading Edge Blanking
FEEDBACK INPUT SECTION
Feedback Pin Input Leakage Current
Feedback Threshold
IFB
VFB
VFB=4V
11.0
3.90
-1.2
13.5 15.0
4.00 4.10
-1.0 -0.9
µA
V
Enable Turn-on Voltage
VFB(EN)
V
COMP THRESHOLD VOLTAGE SECTION
Turn-on Threshold Voltage
PROTECTION SECTION
Over Voltage Protection
VCOMP
VFB(OVP)
3.28
7
3.4 3.58
V
V
8
9
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UPSR100
Preliminary
CMOS IC
OPERATION DESCRIPTION
The UTC UPSR100 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 voltage regulator provides the internal power supply VDD. For VCC and VDD external capacitors are required.
The current biasing of UTC UPSR100 is adjustable by an external resistor. Internal time constants, thresholds and
the output current depend from the value of this resistor. The startup circuit activates the IC after startup and
deactivates the IC in case of UVLO.
Operating Current
The Operating current of UTC UPSR100 is as low as 500µA. 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
UPSR100 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 + ΔV）
(1)
NS
Where △V indicates the drop voltage of the output diode.
Figure 2. 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 4V 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 4V reference voltage and the error amplifier output reaches its maximum, thus
UTC UPSR100 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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UPSR100
Preliminary
CMOS IC
OPERATION DESCRIPTION
Figure 3. Adjustable output power by changing RCS
Figure 4. Secondary current waveform
In CC operation, the CC loop control function of UTC UPSR100 will keep a fixed proportion between secondary
inductance de-magnetization time (Tdemag) and switching cycle time (Tsw). The fixed proportion is
Tdemag
Tsw
4
7
=
(2)
(3)
Thus the output current is given by:
1
2
NP
NS
Tdemag
Tsw
2
7
NP
NS
Iout =
×
×Ipk×
=
×
×Ipk
Current Sensing and Leading Edge Blanking
Cycle-by-cycle current limiting is offered in UTC UPSR100. 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 VCC. 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, feedback loop open protection, Cycle-by-cycle current limiting, short circuit protection,
leading edge blanking and UVLO, etc.
VCC is supplied by transformer auxiliary winding output. The output of UTC UPSR100 is shutdown when VCC drops
below VTH(OFF) and the power converter enters power on start-up sequence thereafter.
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UPSR100
Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
L
Is
Vo
Io
+
+
D1
NS
Co
N
NP
NA
VCC
Q1
FB
OUT
UTC
UPSR100
COMP
CS
VDD
BIAS
Rcs
GND
A typical flyback application by UTC UPSR100
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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