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INTELLIGENT VOLTAGE MODE PWM IC KA3511/D GENERAL DESCRIPTION 22-DIP-400 / 24-SOP-300 The KA3511/D is a fixed-frequency improvedperformance pulse-width modulation control circuit with complete housekeeping circuitry for use in the secondary side of SMPS (Switched mode power supply). It contains various functions, which are precision voltage reference, over voltage protection, under voltage protection, remote on/off control, power good signal generator and etc. OVP (Over voltage protection) section It has OVP functions for +3.3V,+5V,+12V and PT outputs. The circuit is made up of a comparator with four detecting inputs and without hysteresis voltage. Especially, PT (Pin16) is prepared for an extra OVP input or another protection signal. ORDERING INFORMATION Device Package Operating Temperature UVP (Under voltage protection) section KA3511 22 DIP -25°C ~ 85°C It also has UVP functions for +3.3V, +5V, +12V outputs. The block is made up of a comparator with three detecting inputs and without hysteresis voltage. KA3511D 24 SOP -25°C ~ 85°C FEATURES Remote on/off section • Complete PWM control and house keeping circuitry • Few external components • Precision voltage reference trimmed to 2% • Dual output for push-pull operation • Each output TR for 200mA sink current Precision reference section • Variable duty cycle by dead time control The reference voltage trimmed to ± 2% (4.9V≤Vref≤5.1V) • Soft start capability by using dead time control • Double pulse suppression logic • Over voltage protection for 3.3V / 5V / 12V • Under voltage protection for 3.3V / 5V / 12V • One more external input for various protection (PT) • Remote on/off control function (PS-ON) • Latch function controlled by remote and protection input • Power good signal generator with hysteresis Remote on/off section is used to control SMPS externally. If a high signal is supplied to the remote on/ off input, PWM signal becomes a high state and all secondary outputs are grounded. The remote on/off signal is transferred with some on-delay and off-delay time of 8ms, 24ms respectively. PG (Power good signal generator) section Power good signal generator is to monitor the voltage level of power supply for safe operation of a microprocessor. KA3511 requires few external components to accomplish a complete housekeeping circuits for SMPS. The KA3511 is available in a 22-pin dual in-line package. KA3511/D INTELLIGENT VOLTAGE MODE PWM BLOCK DIAGRAM RT CT COMP V5 7 OSCILLATOR D Q CK Q PWM CONTROL 8 22 C1 20 C2 21 E 2 V12 R DEAD TIME CONTROLLER 3 E/A(-) DELAY CONTROLLER 5 REMOTE ON/OFF Q TREM 6 4 E/A(+) S REM (PS-ON) 1.25V 0.1V DEAD TIME CONTROL 1.4V 11 PG 19 5V INTERNAL BIAS 12 VREF VREF VREF Start Up V CC 1 COMP1 VREF PG GENERATOR Ichag 1.25V 5V DET OVP COMP COMP3 9 1.8V 0.6V 1.8V 0.6V COMP2 1.25V UVP COMP 1.25V 10 17 T PG 2.2uF T UVP 2.2uF 18 GND 16 PT 15 V12 14 V5 13 V3.3 INTELLIGENT VOLTAGE MODE PWM IC KA3511/D PIN DESCRIPTION : KA3511 C1 E C2 DTC GND TUVP PT V12 V5 V3.3 Vref #22 #12 KA3511 #1 #11 V CC COMP Pin No. Name I/O 1 VCC I 2 COMP 3 E/A(-) EA(+) TREM Function REM RT CT DET TPG PG Pin No. Name I/O Function Supply voltage 12 Vref O Precision reference VTG O E/A output 13 V3.3 I OVP, UVP input for 3.3V E/A(-) I E/A (-) input 14 V5 I OVP, UVP input for 5V 4 E/A(+) I E/A (+) input 15 V12 I OVP, UVP input for 12V 5 TREM – Remote on/off delay 16 PT I Extra protection input 6 REM I Remote on/off input 17 TUVP – UVP delay 7 RT – Oscillation freq. setting R 18 GND – Signal ground 8 CT – Oscillation freq. setting C 19 DTC I Deadtime control input 9 DET I Detect input 20 C2 O Output 2 10 TPG – PG delay 21 E – Power ground 11 PG O Power good signal output 22 C1 O Output 1 KA3511/D INTELLIGENT VOLTAGE MODE PWM PIN DESCRIPTION : KA3511D C1 E C2 DTC GND TUVP PT V12 V5 V3.3 Vref NC #24 #13 KA3511D #12 #1 Vcc Pin No. Name I/O 1 VCC I 2 COMP 3 COMP E/A(-) EA(+) TREM REM Function RT CT DET TPG PG NC Pin No. Name I/O Function Supply voltage 13 NC - NC O E/A output 14 Vref O Precision reference VTG E/A(-) I E/A (-) input 15 V3.3 I OVP, UVP input for 3.3V 4 E/A(+) I E/A (+) input 16 V5 I OVP, UVP input for 5V 5 TREM – Remote on/off delay 17 V12 I OVP, UVP input for 12V 6 REM I Remote on/off input 18 PT I Extra protection input 7 RT – Oscillation freq. setting R 19 TUVP – UVP delay 8 CT – Oscillation freq. setting C 20 GND – Signal ground 9 DET I Detect input 21 DTC I Deadtime control input 10 TPG – PG delay 22 C2 O Output 2 11 PG O Power good signal output 23 E – Power ground 12 NC - NC 24 C1 O Output 1 INTELLIGENT VOLTAGE MODE PWM IC KA3511/D Pin No. Name Function 1 VCC 2 COMP Error amplifier output. It is connect to non-inverting input of pulse width modulator comparator. 3 E/A(-) Error amplifier inverting input. Its reference voltage is always 1.25V. 4 E/A(+) Error amplifier non-inverting input feedback voltage.This pin may be used to sense power supply output voltage. 5 TREM Remote on/off delay. Ton/Toff=8ms/24ms (Typ.) with C=0.1uF. Its high/low threshold voltage is 1.8V/0.6V. 6 REM 7 RT Oscillation frequency setting R. (Test Condition RT=10kΩ) 8 CT Oscillation frequency setting C. (Test Condition CT=0.01uF) 9 DET Under-voltage detect pin. Its threshold voltage is 1.25V Typ. 10 TPG PG delay. Td=250ms (Typ) with CPG=2.2uF. The high/low threshold voltage are 1.8V/0.6V and the voltage of Pin10 is clamped at 2.9V for noise margin. 11 PG Power good output signal. PG = “High” means that the power is “Good” for operation and PG = “Low” means “Power fail”. 12(14) Vref Precision voltage reference trimmed to 2%. (Typical Value = 5.03V) 13(15) V3.3 Over voltage protection for output 3.3V. (Typical Value = 4.1V) 14(16) V5 Over voltage protection for output 5V. (Typical Value = 6.2V) 15(17) V12 Over voltage protection for output 12V. (Typical Value = 14.2V) 16(18) PT This is prepared for an extra OVP input or another protection signal. (Typical Value = 1.25V) 17(19) TUVP Timing pin for under voltage protection blank-out time. Its threshold voltage is 1.8V and clamped at 2.9V after full charging. Target of delay time is 250ms and it is realized through external (C=2.2uF). 18(20) GND Signal ground. 19(21) DTC Deadtime control input. The dead-time control comparator has an effective 120mV input offset which limits the minimum output dead time. Dead time may be imposed on the output by setting the dead time control input to a fixed voltage, ranging between 0V to 3.3V. 20(22) C2 21(23) E 22(24) C1 Supply voltage. Operating range is 14V~30V. VCC=20V, Ta=25°C at test. Remote on/off input. It is TTL operation and its threshold voltage is 1.4V. Voltage at this pin can reach normal 4.6V, with absolutely maximum voltage, 5.25V. If REM = “Low”, PWM = “Low”. That means the main SMPS is operational. When REM = “High”, then PWM = “High” and the main SMPS is turned-off. Output drive pin for push-pull operation. Power ground. Output drive pin for push-pull operation. KA3511/D INTELLIGENT VOLTAGE MODE PWM ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Value Unit VCC 40 V Collector output voltage VC1, VC2 40 V Collector output current IC1, IC2 200 mA Power dissipation(KA3511D) PD 0.8 W Power dissipation(KA3511) PD 1.5 W Operating temperature TOPR −25 to 85 °C Storage temperature TSTG −65 to 150 °C Supply voltage TEMPERATURE CHARACTERISTICS Characteristic Temperature coefficient of Vref (-25°C≤Ta≤85°C) Symbol ∆Vref/∆T Value Min. Typ. Max. – 0.01 – Unit %/°C INTELLIGENT VOLTAGE MODE PWM IC KA3511/D ELECTRICAL CHARACTERISTICS (VCC=20V, TA=25°C) Characteristic Symbol Test Condition Value Unit Min. Typ. Max. 4.9 5 5.1 V REFERENCE SECTION Reference output voltage Vref Line regulation Load regulation Temperature coefficient of Vref (1) Short-circuit output current Iref=1mA ∆Vref.LINE 14V≤VCC≤30V – 2.0 25 mV ∆Vref.LOAD 1mA≤Iref≤10mA – 1.0 15 mV ∆Vref/∆T -25°C≤Ta≤85°C – 0.01 – %/°C ISC Vref=0 15 35 75 mA fosc CT=0.01uF, RT=12k – 10 – kHz fosc/T CT=0.01uF, RT=12k – 2 – % – -2.0 -10 uA OSCILLATOR SECTION Oscillation frequency Frequency change with temperature (1) DEAD TIME CONTROL SECTION Input bias current IB(DT) Maximum duty voltage DCMAX Pin19 (DTC)=0V 45 48 50 % Input threshold voltage VTH(DT) Zero Duty Cycle – 3.0 3.3 V Max. Duty Cycle 0 – – 1.20 1.25 1.30 V ERROR AMP SECTION Inverting reference voltage Input bias current Open-loop voltage gain (1) Unit-gain bandwidth (1) Output sink current Vref(EA) IB(EA) VCOMP=2.5V – -0.1 -1.0 uA GVO 0.5V≤VCOMP≤3.5V 70 95 – dB – 650 – kHz BW ISINK VCOMP=0.7V 0.3 0.9 – mA ISOURCE VCOMP=3.5V -2.0 -4.0 – mA VTH(PWM) Zero Duty Cycle – 4 4.5 V Output saturation voltage VCE(SAT) IC=200mA – 1.1 1.3 V Collector off-state current IC(off) VCC=VC=30V, VE=0V – 2 100 uA Output source current PWM COMPARATOR SECTION Input threshold voltage OUTPUT SECTION Rising time TR – 100 200 ns Falling time TF – 50 200 ns VOVP1 3.8 4.1 4.3 V PROTECTION SECTION Over voltage protection for 3.3V KA3511/D INTELLIGENT VOLTAGE MODE PWM ELECTRICAL CHARACTERISTICS (continued) Characteristic Symbol Test Condition Over voltage protection for 5V VOVP2 Over voltage protection for 12V Value Unit Min. Typ. Max. − 5.8 6.2 6.6 V VOVP3 − 13.5 14.2 15.0 V VPT − 1.20 1.25 1.30 V Under voltage protection for 3.3V VUVP1 − 2.1 2.3 2.5 V Under voltage protection for 5V VUVP2 − 3.7 4.0 4.3 V Under voltage protection for 12V VUVP3 − 9.2 10 10.8 V Charging current for UVP delay ICHG.UVP C=2.2uF, VTH=1.8V −10 −15 −23 uA TD.UVP C=2.2uF 100 260 500 ms REM on input voltage VREMH IREM=−200uA 2.0 – – V REM off input voltage VREML − – – 0.8 V REM off input bias voltage IREML VREM=0.4V – – −1.6 mA 2.0 – 5.25 V Input threshold voltage for PT UVP Delay Time REMOTE ON/OFF SECTION REM on open voltage REM on delay time REM off delay time REMOTE ON/OFF SECTION − VREM(OPEN) Ton C=0.1uF 4 8 14 ms Toff C=0.1uF 16 24 34 ms (2) Detecting input voltage VIN(DET) − 1.20 1.25 1.30 V Detecting V5 voltage V5(DET) − 4.1 4.3 4.5 V Hysteresis voltage 1 HY1 COMP1, 2 10 40 80 mV Hysteresis voltage 2 HY2 COMP3 0.6 1.2 – V PG output load resistor RPG 0.5 1 2 kΩ C=2.2uF, VTH=1.8V −10 −15 −23 uA C=2.2uF 100 260 500 ms – 0.2 0.4 V – 10 20 mA Charging current for PG delay PG delay time PG output saturation voltage ICHG.PG TD.PG VSAT(PG) − IPG=10mA TOTAL DEVICE Stanby supply current ICC − Notes: 1. These Parameters, although guaranteed over their recommended operating conditions are not 100% tested in production. 2. REM on delay time (Pin6 REM: “L” → “H”), REM off delay time (Pin6 REM: “H” → “L”) INTELLIGENT VOLTAGE MODE PWM IC KA3511/D APPLICATION INFORMATIONS 300K VCC=15V IO - OSCILLATOR FREQUENCY 100K 0.001µF 10K CT=0.01µF 1K 0.1µF 1.0µF 100 30 1K 2K 5K 10K 20K 50K 100K 200K 500K 1M RT. TIMING RESISTANCE(Ω) Figure 1. Oscillator Frequency vs. Timing Resistance Ct Feedback Dead-time control Ck Q Q Output Q1 Output Q2 Figure 2. Operating Waveform KA3511/D INTELLIGENT VOLTAGE MODE PWM HOUSEKEEPING CIRCUIT 2k Ω( 1 W ) 2k Ω( 1 W ) Standby Supply V CC=20V 1 VCC 2 COMP E 21 3 E/A(-) C2 20 4 E/A(+) DTC 19 GND 18 TUVP 17 C1 22 15k Ω 12V 5V 0.01uF 11k Ω 33k Ω 1.8k Ω 0.1uF 5 TREM 6 REM + 1k Ω Micom 7 K A 3 5 1 1 + 2.2uF RT PT 16 CT V12 15 12V 14 5V 13 3V 12k Ω 8 + 0.01uF 2.2uF 9 DET V5 10 T PG V3.3 + PG 11 PG Vref 12 + 1uF Note) The KA3511 requires few external components to accomplish a complete housekeeping circuits for SMPS. INTELLIGENT VOLTAGE MODE PWM IC KA3511/D TYPICAL CHARACTERISTICS Bandgap Reference Voltage Temperature Characteristic VCC-ICC 0.014 5.010 0.012 5.008 Vref [V] ICC [A] 0.010 0.008 0.006 0.004 5.006 5.004 0.002 5.002 0.000 0 10 20 30 -40 40 -20 0 20 40 Supply Voltage [V] 80 100 120 OVP for 3.3V 50 5 40 4 31.1% 3 VPG [V] 30 21.8% 20 2 12.8% 10 1 0 0 0.0 0.5 1.0 1.5 2.0 3.6 2.5 2.73 3.0 3.8 4.0 Deadtime Control Voltage [V] 4.2 4.4 4.6 V3.3 [V] OVP for 5V OVP for 12V 7 5 6 5 4 4 3 VPG [V] VPG [V] 140 TEMP [°C] PIN19(Dead Time Control Voltage)-Duty Cycle Duty Ratio [%] 60 3 2 2 1 1 0 0 5.0 5.5 6.0 V5 [V] 6.5 7.0 14.0 14.2 14.4 14.6 V12 [V] 14.8 15.0 KA3511/D INTELLIGENT VOLTAGE MODE PWM UVP for 3.3V 5 5 4 4 3 3 VPG [V] VPG [V] OVP for PT 2 2 1 1 0 0 1.15 1.20 1.25 1.30 21 1.35 22 5 5 4 4 3 3 2 2 1 1 0 0 4.0 4.2 4.4 25 UVP for 12V VPG [V] VPG [V] UVP for 5V 3.8 24 Pin 13 (V3.3) Voltage [V] Vpt [V] 3.6 23 4.6 4.8 9.0 5.0 9.5 10.0 10.5 11.0 Pin 15 (V12) Voltage [V] Pin 14 (V5) Voltage [V] Remote ON Charging Current REM ON/OFF Vth -0.000016 5 4 VPG [V] Irem [A] -0.000018 -0.000020 -0.000022 3 2 1 -0.000024 0 0 50 100 150 200 250 0 1 2 3 Vrem [V] 4 5 INTELLIGENT VOLTAGE MODE PWM IC KA3511/D Detecting VCC Voltage (DET) 5 5 4 4 VPG [V] Vrem [V] Remote ON Open Voltage 3 3 2 2 1 1 0 0 0 1 2 3 4 5 1.0 1.1 1.2 1.3 1.4 1.5 Pin 9 (DET) Voltage [V] Detecting V5 Voltage Charging Current for PG -0.000005 5 -0.000010 IPG [V] VPG [V] 4 3 2 1 -0.000015 -0.000020 0 4.0 4.2 4.4 4.6 4.8 5.0 0 20 40 60 80 100 120 140 160 Pin 14 (5V) Voltage [V] Short Circuit Current Hysteresis Voltage 2 5 -0.032 -0.033 VPG [V] Iref [A] 4 -0.034 3 2 1 -0.035 0 0 100 200 300 400 0.0 0.5 1.0 1.5 2.0 Pin 10 (TPG) Voltage [V] 2.5 KA3511/D INTELLIGENT VOLTAGE MODE PWM Error Amp Sink Current Reference Voltage 0.002 5 4 -0.002 Vref [V] Isink & Isource [A] 0.00 -0.004 -0.006 3 2 1 -0.008 0 0 20 40 60 80 100 120 140 0 10 20 30 Supply Voltage [V] 40 INTELLIGENT VOLTAGE MODE PWM IC KA3511/D EXPERIMENTAL RESULT CH1 : PS-ON CH2 : +5Vdc Output CH3 : PG Signal Figure 3. Rising Time of +5Vdc Output Voltage CH1 : PS-ON CH2 : +5Vdc Output CH3 : PG Signal Figure 4. PG Signal Delay Time KA3511/D INTELLIGENT VOLTAGE MODE PWM CH1 : PS-ON CH2 : +5Vdc Output CH3 : PG Signal Figure 5. Power Down Warning CH1 : +3.3Vdc Output CH2 : +5Vdc Output CH3 : +12Vdc Output Figure 6. No Load Protection INTELLIGENT VOLTAGE MODE PWM IC KA3511/D CH1 : Vcc CH2 : +5Vdc Output CH3 : PG Signal Figure 7. Vcc, +5Vdc Output vs. PG Signal (High) CH1 : Vcc CH2 : +5Vdc Output CH3 : PG Signal Figure 8. Vcc, +5Vdc Output vs. PG Signal (Low) KA3511/D INTELLIGENT VOLTAGE MODE PWM APPLICATION CIRCUIT 47K 70K R6 R5 VCC 3 15K 4 POWER ON 5 + 0.1uF 6 OUT REF 7 8 103 9 10 + 11 COMP E E/A(-) C2 E/A(+) DTC TREM GND REM TUVP RT PT CT V12 DET TPG PG V5 V3.3 Vref C1 22 21 20 R4 1.2K C2 19 18 17 16 R3 56K 2.2uF 15 5V OUT 13 3.3V OUT 12 D19 D9 C16 100K C6 22uF 12V OUT 14 AR3511X VR1 + PG 2.2uF C1 + 2 Vcc + IC1 1 103 CT INTELLIGENT VOLTAGE MODE PWM IC PACKAGE DIMENSION KA3511/D KA3511/D PACKAGE DIMENSION INTELLIGENT VOLTAGE MODE PWM LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com 12/28/99 0.0m 001 Stock#DSxxxxxxxx 1999 Fairchild Semiconductor Corporation