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KA7552A/KA7553A
SMPS Controller
Features
* Built-in Drive Circuits for Direct Connection POWER MOSFET (lO= 1.5A) * Wide Operating Frequency Range (5KHz ~ 600KHz) * Pulse By Pulse Over Current Limiting * Over Load Protection * On/Off Control By External Trigger * Internal UVLO * Low Standby Current (Typ. 90uA) * Soft Start Circuit
Description
The KA7552A/KA7553A are switching power control IC for wide operating frequency range. The internal circuits include pulse by pulse current limiting, protection, on/off control by external trigger, low standby current, soft start, and high current totempole output for driving a POWER MOSFET. Maximum duty of the KA7552A is 70% and the KA7553A is 46%. When duty is maximum, the input threshold voltage of pin2 & pin8 are not same in KA7552A and KA7553A.
8-DIP
1
Internal Block Diagram
Rev. 5.0
(c)2000 Fairchild Semiconductor International
KA7552A/KA7553A
Absolute Maximum Ratings
Parameter Supply Voltage Output Current Input Voltage at Overcurrent Detection Pin Input Voltage at FB Pin Input Current at CS Pin Total Power Dissipation (Ta = 25C) Operating Temperature Symbol VCC IO VIN(IS) VIN(FB) IIN(CS) PD TOPR Value 30 1.5 - 0.3 to 4 4 2 800 - 25 to 85 Unit V A V V mA mW C
Electrical Characteristics
(VCC = 18V, FOSC = 135KHz, TA = 25C, unless otherwise specified) Parameter OSCILLATOR SECTION Initial Accuracy Frequency Variation 1 Frequency Variation 2* Ramp High Voltage Ramp Low Voltage Amplitude Input Threshold Voltage(Pin2) Input Threshold Voltage(Pin2)* Max. Duty Cycle Source Current(Pin2) OVERCURRENT LIMIT SECTION Input Threshold Voltage Source Current(Pin3) Deley Time* SOFT START SECTION Charging Current Input Threshold Voltage(Pin8) Input Threshold Voltage(Pin8) * ICHG VTH(CSO) VTH(CS1)(KA7552) VTH(CS2)(KA7553) LATCH MODE SHUTDOWN CIRCUIT SECTION Sink Current(Pin8) Shutdown Threshold Voltage Shudown Threshold Voltage OVERLOAD SHUTDOWN SECTION VTH(SD,FB) 2.6 2.8 3.1 V ISINK(CS) VTH(SD,CS) VPIN8 = 6V, VPIN2 = 1V 25 6.7 45 7.2 65 7.7 uA V VPIN8 = 0V Duty Cycle = Dmax 1 Duty Cycle = Dmax 2 -15 0.7 2.2 1.7 -10 0.9 2.4 1.9 -5 1.1 2.6 2.1 uA V V V VTH(IS) ISOURCE(IS) TD VPIN3 = 0V 0.21 -300 0.24 -200 150 0.27 -100 V uA ns FOSC F/V F/V VRH VRL VOSC VTH(FBD) VTH(FB1)(KA7552) VTH(FB2)(KA7553) D(Max1)(KA7552) D(Max2)(KA7553) ISOURCE(FB) VPIN2 = 0V CT = 360pF, TJ = 25C VCC = 10V to 30V TA = 25C to 85C CT = 360pF, TJ= 25C CT = 360pF, TJ = 25C VPIN7, Peak to Peak Duty Cycle = 0% Duty Cycle = Dmax 1 Duty Cycle = Dmax 2 125 2.80 0.6 1.80 0.6 2.1 1.6 66 43 135 1 1.5 3.08 0.9 2.18 0.75 2.3 1.8 70 46 145 3 3.30 1.2 2.50 0.95 2.6 2.1 74 49 KHz % % V V V V V V % % uA Symbol Conditions Min. Typ. Max. Unit
PULSE WIDTH MODULATION SECTION
- 660 - 800 - 960
2
KA7552A/KA7553A
Electrical Characteristics (Continued)
(VCC = 18V, FOSC = 135KHz, TA = 25C, unless otherwise specified) Parameter UNDER VOLTAGE LOCKOUT SECTION Start-Up Threshold Voltage Minimum Operating Voltage Hysteresis ON/OFF CONTROL SECTION Source Current(Pin8) On Threshold Voltage Off Threshold Voltage OUTPUT SECTION Low Output Voltage High Output Voltage Rise Time* Fall Time* OVERALL Stard-by Current Operating Current Power Supply Current off Power Supply Current Shutdown ISB ICC(OPR) ICC(OFF) ICC(SD) VCC = 14V VPIN2 = 0V VPIN8 = 0V VPIN8 = 7.6V 90 9 1.1 1.1 150 15 1.8 1.8 uA mA mA mA VOL VOH TR TF IO = 100mA, VCC = 18V IO = -100mA, VCC = 18V NO LOAD NO LOAD 16.0 1.3 16.5 50 50 1.8 18.0 V V ns ns ISOURCE(CS) VTH(ON) VTH(OFF) VPIN8 = 0V VPIN8 : OFF->ON VPIN8 : ON -> OFF - 15 0.45 0.30 - 10 0.56 0.42 -5 0.70 0.55 uA V V VTH(ST) VOPR(Min) VHYS 15.5 8.20 6.40 16.0 8.70 7.30 16.5 9.20 8.20 V V V Symbol Conditions Min. Typ. Max. Unit
Note : 1. These parameters, although guaranteed, are not 100% tested in production. 2. Recommend Operating Condition : RT = 3.3K ~ 10K, Oscillation Frequency = 5KHz ~ 600KHz Soft Start Capacitor(CS) = 0.1uF ~ 1uF
3
KA7552A/KA7553A
Mechanical Dimensions
Package Dimensions in millimeters
8-DIP
1.524 0.10 0.018 0.004 0.060 0.004 0.46 0.10
6.40 0.20 0.252 0.008
#1
#8
9.20 0.20 0.362 0.008 9.60 MAX 0.378
#4
#5
2.54 0.100
(
0.79 ) 0.031
5.08 MAX 0.200 7.62 0.300 3.40 0.20 0.134 0.008
3.30 0.30 0.130 0.012 0.33 0.013 MIN
0.25 -0.05
0~15
+0.10
0.010 -0.002
+0.004
4
KA7552A/KA7553A
Ordering Information
Product Number KA7552A KA7553A Package 8-DIP Operating Temperature -25 ~ + 85C
5
KA7552A/KA7553A
DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. 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 INTERNATIONAL. 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.
www.fairchildsemi.com 9/25/00 0.0m 001 Stock#DSxxxxxxxx 2000 Fairchild Semiconductor International
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.

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