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RS2201
Switching Power Supply Controller
Description
RS2201, produced by advanced integrated circuit process, is a switch power supply controller, which could offer over-load and saturation protection, and achieve green economize on energy and environmental protection standard. RS2201 could achieve AC/DC conversion and can be widely applied to economical switching power supply equipment. For instance, ChargerDVD, Induction cooker, STB, Printer, LCD and so on.
Features
Over-load and saturation protection could protect over-load, switch transformer saturation and output short circuit or the relative failures. It is economical that triode is used for switch device, which could start up the circuit with its amplification function and reduce ten times of power consumption of the start-up resistance. Built-in Synchronized Slope Compensation circuit, thermal protection circuit, slope current drive circuit. Zero-load output power consumption could be less than 0.3W, is less than 0.2W while 220V AC input. Pin to Pin THX201 Pb-Free DIP-8 and SOP-8 Package.
Applications
Switching AC/DC Adaptor Battery Charger Open Frame Switching Power Supply Standby Power Supplies Set-Top Box Power Supplies 384X Replacement
Pin Configurations
Name CT VR FB GND IS OE OB VCC
Description By connecting a cap to ground to set the switching frequency 2.5V reference voltage output Feedback pin GND Current sense. Power Transistor Emitter drive output and start-up current input. Power Transistor Base drive output and start-up current control. Power Supply.
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Typical Application Circuit
Operation description
Initially, after power up, no output of VR. FB pull-up current source is turn off. OE inputs start-up current from power transistor to VCC. OB controls the base current of power transistor and limits the collector current (start-up accept current of RS2201) of power transistor so to safeguard the power transistor. When the VCC voltage rises to 7.8V, the start-up phase completes and goes to the normal operation. In normal operation, VCC voltage must keep 4.75~9.8V, VR outputs 2.5V reference voltage. FB pull-up current source turns on. Oscillator outputs OSC1 to decide the maximum duty cycle and OSC2 to trigger power supply entering the open cycle and cover spike value of power transistor start-up current. If FB is less than 1.8V(about 1.2-1.8V), the less the FB is, the wider the oscillation cycle is.This characteristics reduces the standby consumption of the switching power supply. If external feedback intends to get VCC greater than 9.8V, the internal feedback circuit regular VCC on 9.8V.Making use of this characteristics to stable output voltage no using external feedback circuit, but the regulating is not precise. In open cycle, OB provides the base current for power transistor, OE pulls down the emitter of power transistor to IS and OB adopts slop current drive (OB open current is IS function, when IS=0V,OB open current is about 40mA, and OB open current is increasing with IS linear increasing. When IS increases 0.6V, OB open current is about 120mA. This characteristics makes use of output current of OB effectively and reduces power consumption of RS2201). If IS detects the FB designated current, it enters closed cycle. In closed cycle, OB pulls down, the power transistor is not be turn off immediately but OE clamps 1.5V (after power transistor is turn off, the base is reverse bias, the breakdown voltage of power transistor is improved). In the open or closed cycle, if power transistor is detected to exceed upper limit current, the upper limit current trigger will set firstly and forces FB to pull down, duty cycle reduced, so to protect power transistor and transformer. In the next closed cycle start-up time, or when FB is less than 1.8V, upper current trigger resets. In addition, RS2201 is built in thermal protection, when the internal temperature is above 140, it will widen the cycle of oscillator, so that the temperature of RS2201 will not exceed 150. Slop compensation is built in to stabilization open/closed cycle during the maximum duty cycle or the continual current mode of RS2201. If VCC reduces to 4.4V, oscillator is turn off, OSC1 OSC2 low level, power supply keeps closed cycle. when VCC continually reduces to about 4.0 V , RS2201 enters start-up phase again.
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Fig.1 OPEN/CLOSED CYCLE WAVES IN NORMAL OPERATION
Electrical parameter definition
Start-up accept current: OE node current when OB has a 0.1mA pull-down current in start-up phase. Start-up static current: VCC connects to filter capacitor and adjustable current source, CT connects to 680PFother pins are floating. It is the minimum current that could oscillate the VCC. Start-up voltage: The max. value of VCC oscillation above. Restart voltage: The min. value of VCC oscillation above. Voltage of Oscillator is turn off: VCC value, which stops the oscillator in falling time of VCC oscillation above. Static current: In normal operation, FB connects to the grand through 1.8K resistor. VCC power supply current. The pull-up/ pull-down current of oscillator: In normal operation, FB=2.5V,CT=1.25V, pull-up /pull-down current on CT.
Fig.2 RS2201 ALL SIGNAL WAVES DS-RS2201-01 Nov, 2007 www.Orister.com
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FB pull-up current: In normal operation, when FB=2.5V,IS=0V, pull up current on FB. FB protecting upper limit current: In normal operation, FB=2.5V,IS=0.8Vpull down current on FB. Internal feedback power supply voltage: In normal operation, VCC value of RS2201 power supply without external standby feedback circuit. IS upper limit current: FB=2.5Vexternal adjustable power supply to IS, there is minimal IS voltage of pull-down current on FB. Slope current drive: OB open current is IS function, when IS=0V,OB open current is about 40mA, and OB open current is increasing with IS linear increasing. When IS increases 0.6V, OB open current is about 120mA. OSC Frequency: C function of CT pin external capacitor, is about C*24000 seconds.
Electrical Characteristics
Symbol Ics Parameter Start-up accept current Start-up static current Start-up voltage Oscillator cut off voltage Restart voltage Inner oscillator voltage Operating Current VR reference voltage Oscillator Frequency Oscillator pull-up current Oscillator pull-down current Maximum Duty Cycle FB Feedback Voltage FB pull-up current FB prevent upper limit current IS upper limit current OE Clamp Voltage OB open current OB open current OB closed current OB closed current OE output current Conditions Min. 1.6 7.6 4.25 9.6 VCC=8V 2.4 CT*24000 CT=1.25V CT=1.25V CT=680PF IS=0.5V,CT=0.6V FB=2.5V,IS=0V FB=2.5V,IS=0.8V R IS-GND =0.75 OE=0.001~1.2A IS=0.5V IS=0.0V OB-IS=1V OB-IS=0.25V OE-IS=0.6V Typ. 2.0 55 7.8 4.50 4.0 10.0 3.5 2.5 64 100 1.9 55 4.8 590 310 0.60 1.6 120 44 -210 -4.5 -1.2 Max. 2.4 80 8.0 4.75 10.4 2.6 Unit mA uA V V V V mA V KHz uA mA % V uA uA V V mA mA mA mA A
Icc VR Fosc
53
61
0.54 102 32 -145
0.62 140 60 -230 -6 -1
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RS2201 - 12W12V/1ADemo Board Circuit Diagram
BOM List
Part Location R1 R2 R3 R4, R5 R6 R7, R10 R8 R9 R11 R12 C1, C2 C3 C4 C5 C6 C7 C8 C9,C10 CX1 CY1 B1 D1;D2 D3 D4 F1 L1 LF1 Q1 T1 LED1 U1 U2 U3 Description RES;SMD;1206;+/-5% RES;SMD;1206;+/-5% RES;SMD;0805;+/-5% RES;SMD;1206;+/-5% RES;SMD;0805;+/-5% RES;SMD;0805;+/-5% RES;SMD;0805;+/-5% RES;SMD;0805;+/-3% RES;SMD;0805;+/-3% RES;MOF;+/-5%,1W C/E;10*15;105;+/-20%;KMG C/C;DIP;+/-10%;Pintch=200mil C/E;5*11;105;+/-20% C/C;DIP;+/-10%;Pintch=200mil C/C;SMD;+/-10%;0805 C/C;SMD;+/-10%;0805 C/C;SMD;+/-10%;0805 C/E;8*12;105;+/-20%;Pintch=150mil C/X1;+/-20%;275V;Pintch=400mil;DAIN C/Y1;+/-20%;Pintch=400mil; BRIGE; SMD;1A DIODE; 3A;100V; DO-201AD DIODE; 1A;1000V;Fast Recovery;SMA-214 DIODE;1A;100V;DO-35 FUSE,T2AL/250V;4.5*14.5L;Glass 7*10; 1 A FILTER;UU9.8 1.5A;TRANSISTOR;Vcev700V HFE=20;+/-10%;TO225A TRANSFORMER; GREEN;3 DIP8 DIP SOT23-3 Value 2.2M 100K 4.7 47 1K 3.3K 10K 10K 39K 1 10uF/400V 222/1KV 47uF/25V 102/100V 681/25V 104/25V 103/25V 470uF/16V 104/275Vac 222M/400V 1A/600V SR3100 FR107 1N4148 FUSE 10uH 20mH MJE13003 EI-22 GREEN RS2201 PC817 TL431 QTY 1 1 1 1 1 2 1 1 1 1 2 1 1 1 1 1 1 2 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 UNIT PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS PCS
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Transformer Design
Transformer Specification 1)Bobbin&PinEI22(10PIN) 2)CorePC40(TDK) 3) L(1-3) = 1.3mH+/-5% (1KHZ0.3V25)
Winding Table Part No. 1 2 3 4 5 6 7 8 Winding NP1 TAPE NS TAPE NP2 TAPE NVCC TAPE Start 2 9,10 3 4 Closed 3 7,6 1 5 (T) 48 2 15 2 46 2 9 2 Wire Gauge(mm) 0.27*1 W=8mm 0.51*1 W=8mm 0.27*1 W=8mm 0.18*1 W=8mm Note
1
9,10
Np2
3
Np1
2
Ns
4 5
Nvcc
6,7
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Features of Power supply design
Switching power supply design of fly back current control, discontinuous( a little continuous on the low voltage) current operating mode. Start-up current of power supply is designed of 0.5-3mAthe amplification multiple of power transistor should be calculate as 10 times. To choose start-up resistor, the base current of power transistor must be 0.05-0.3mA when power supply starts up. So the power consumption of start-up resistor should be reduced 10 times to reduce standby power consumption. C5=680pFthe maximum operating frequency is about 60KHz. Switching transformer providing operation current for RS2201 with operating power supply consults winding commutating output 4.8-9V(6V is recommend). If the maximum value of primary peak current of switching transformer is 0.8A. When demagnetization voltage is 140V in 220Vac, the maximum output power is 22W considering of power supply efficiency or other factors. If the wide voltage and 90V demagnetization voltage in 110Vac, a little continuous current mode is adapted when the voltage is below 95Vac, the maximum output power is 18W. The choice of power transistor: If the maximum peak value current is 0.8A, the value of power transistor should reach 10@5Vce@0.8A considering of OB open current and the corresponding detecting resistor is 0.75. The power transistor should work at the saturation zone in any case and detecting resistor is 0.6V/the maximum value peak current. Even the RS2201 has thermal protection, but if high output power is needed, it would reduce output power and output voltage if widening thermolysis area of PCB is not considered. And when the output power is high, power transistor thermolysis issue must be considered.
RS2201 12W12V/1ADEMO CHARACTERISTIC TEST REPORT
Table 1 Input characteristic at full load Input voltage Irms(A) Pin(W) 90V/63Hz 0.163 14.9 115V/60Hz 0.122 14.5 230V/50Hz 0.056 14.5 264V/47Hz 0.053 14.7 Table 2 Standby power at no load(4mA LED current) Input voltage Vo(V) 90V/63Hz 12.205 115V/60Hz 12.205 230V/50Hz 12.204 264V/47Hz 12.204 Table 3 Line Regulation & Load Regulation Input voltage 90Vac/60HZ 115Vac/60HZ 132Vac/60HZ 180Vac/50HZ 230Vac/50HZ 264Vac/50HZ Line Regulation Load Regulation No load 12.205 12.205 12.204 12.205 12.204 12.204 Half load 12.203 12.203 12.203 12.203 12.203 12.202 0.008% 0.033% Full load 12.202 12.202 12.202 12.201 12.201 12.201 <1% <5% Pass Pass Specification Test result Vo(V) 12.202 12.202 12.201 12.201 Io(A) 1 1 1 1 81.9 84.2 84.2 83.0 Specification >75% Test result Pass
Pin(W) 0.19 0.20 0.25 0.27
Specification <0.3W
Test result Pass
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Table 4 Line Regulation & Load Regulation Input voltage 90Vac/60HZ 115Vac/60HZ 230Vac/50HZ 264Vac/50HZ No load 10.3mV 12.5mV 17.6mV 19.4mV Full load 23.4mV 24.2mV 26.8mV 29.0mV <60mV Specification Test result Pass Pass Pass Pass Note
Note: Ripple & noise was measured at DC cord end(1.2M/18AWG)with a 0.1uF/100V ceramic cap connected in parallel with a 10uf/50V electrolytic cap. Bandwidth was limited to 200MHz. Table 5 Test Item Input characteristic Input current Standby power Efficiency Output characteristic Line regulation Load regulation Ripple & Noise Over shoot & Under shoot Dynamic test Time sequence Turn on delay time Hold up time Rise time Fall time Protection Over voltage protection Over current protection Short circuit protection 5. Brownout/Brownout recovery Pass 1.2~1.7A Pass Pass <1S >10mS 300mS(max) 12.4mS 14.6 mS 11.7 mS 1% 5% 60mV 600mV 600mV 0.008% 0.033% 29mV(max) 350mV 300mV (264Vac,with LED (4mA current)) 0.3A Max. <0.3W >75% 0.163A 0.27W 81.9%(min) Specification Test result
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PACKAGE DEMENSIONS
DIP-8L
Dimensions
Symbol A A1 A2 b b1 D E E1 e L eB Millimeters Min. 0.381 3.175 Typ. Max. 5.334 3.429 Min. 0.015 0.125 Inches Typ. Max. 0.210 0.135
9.017 6.223 2.921 8.509 0
3.302 1.524 0.457 9.271 7.620 6.350 2.540 3.302 9.017 7
10.160 6.477 3.810 9.525 15
0.355 0.245 0.115 0.335 0
0.130 0.060 0.018 0.365 0.300 0.250 0.100 0.130 0.355 7
0.400 0.255 0.150 0.375 15
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SOP-8L
Dimensions
Symbol A A1 b c D E e F H L Millimeters Min. 1.346 0.101 0.406 0.203 4.648 3.810 1.016 5.791 0.406 0 4.978 3.987 1.524 6.197 1.270 8 0.183 0.150 0.040 0.228 0.016 0 Typ. Max. 1.752 0.254 Min. 0.053 0.004 0.016 0.008 0.196 0.157 0.060 0.244 0.050 8 Inches Typ. Max. 0.069 0.010
1.270 0.381X45
0.050 0.015X45
Ordering Information
PART NUMBER RS2201S RS2201P PIN-PACKAGE SOP-8L DIP-8L
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Soldering Methods for Orister's Products
1. Storage environment: Temperature=10oC~35oC Humidity=65%15% 2. Reflow soldering of surface-mount devices Figure 1: Temperature profile
tP TP Ramp-up TL Tsmax Temperature tL Critical Zone TL to TP
Tsmin tS Preheat
Ramp-down
25
t 25oC to Peak Time
Profile Feature Average ramp-up rate (TL to TP) Preheat - Temperature Min (Tsmin) - Temperature Max (Tsmax) - Time (min to max) (ts) Tsmax to TL - Ramp-up Rate Time maintained above: - Temperature (TL) - Time (tL) Peak Temperature (TP) Time within 5oC of actual Peak Temperature (tP) Ramp-down Rate Time 25oC to Peak Temperature 3. Flow (wave) soldering (solder dipping) Products Pb devices. Pb-Free devices.
Sn-Pb Eutectic Assembly <3oC/sec 100oC 150oC 60~120 sec <3oC/sec 183oC 60~150 sec 240oC +0/-5oC 10~30 sec <6oC/sec <6 minutes
Pb-Free Assembly <3oC/sec 150oC 200oC 60~180 sec <3oC/sec 217oC 60~150 sec 260oC +0/-5oC 20~40 sec <6oC/sec <8 minutes
Peak temperature 245 C 5 C 260 C +0/-5 C
o o o o
Dipping time 5sec 1sec 5sec 1sec
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Important Notice:
* All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of Orister Corporation. * Orister Corporation reserves the right to make changes to its products without notice. * Orister Corporation products are not warranted to be suitable for use in Life-Support Applications, or systems. * Orister Corporation assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.
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Nov, 2007
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