3563

3563 UTC | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 10

Technical content

UTC 3563 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R103-013,B HIGH-EFFICIENCY DC/DC CONVERTER

DESCRIPTION

The UTC 3563 is a monolithic control circuit containing the primary functions required for DC to DC converters and highside-sensed constant current source. The device consists of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current sense circuit, bootstrapped driver, and high current output switch. This device is specifically designed to construct a constant current source for battery chargers with a minimum number of external components. Bootstrapped driver can drive the NPN output switch to saturation for higher efficiency and less heat dissipation. The UTC 3563 can deliver 1.5A continuous current without requiring a heat sink.

FEATURES

*3V to 30V input voltage operation. *Internal 2A peak current switch. *1.5A continuous output current. *Bootstrapped driver. *High side current sense capability. *High efficiency (up to 90%) *Internal ±2% reference. *Low quiescent current at 1.6mA. *Frequency operation from 100Hz to 100KHz. DIP-8 SOP-8

APPLICATIONS

*Constant current source for battery chargers. *Saver for cellular phones. *Step-Down DC-DC converter module. PIN CONFIGURATION DC DE CF GND BOOST IS VCC FB

UTC 3563 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R103-013,B BLOCK DIAGRAM PIN SYMBOL DESCRIPTION PIN SYMBOL DESCRIPTION

1 DC 2A switch collector 5 FB Feedback comparator inverting input

2 DE Darlington switch emitter 6 VCC Power supply input

3 CF Oscillator timing capacitor 7 IS Highside current sense input

(VCC-VIS=300mV)

4 GND Power ground 8 BOOST Bootstrapped driver collector

UTC 3563 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R103-013,B ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER SYMBOL VALUE UNIT Supply Voltage VCC 30 V Comparator input voltage range Vi -0.3~+30 V Switch collector voltage V C(switch) 30 V Switch emitter Voltage V E(switch) 30 V Switch collector to emitter voltage V CE(switch) 30 V Driver collector Voltage V C(driver) 30 V Switch current I SW 2 A Power dissipation (Ta=25°C) DIP-8 SOP-8 1000 625 mW mW Thermal Resistance DIP-8 SOP-8 100 160 °C/W °C/W Operating junction temperature Tj 125 °C Operating ambient temperature range Ta 0~+70 °C Storage temperature range Tstg -65~+150 °C ELECTRICAL CHARACTERISTICS (VCC=5.0V, Ta=25°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP. MAX UNIT Oscillator Charging Current I CHG 5V≤VCC≤30V 10 25 40 µA Discharging Current I DISCHG 5V≤VCC≤30V 100 150 200 µA Voltage Swing Vosc PIN 3 0.6 V Discharge to Charge Current Ratio I DISCHG / ICHG V IS=VCC 6.0 Current limit Sense Voltage VCC -V IS ICHG=IDISCHG 250 300 350 mV Output Switch Saturation Voltage, Emitter Follower Connection VCE(SAT) I DE=1.0A, VBOOST=VDC=VCC 1.5 1.8 V Saturation Voltage V CE(SAT) I DC=1.0A, IBOOST=50mA, (Forced β≈20) 0.4 0.7 V DC Current Gain h FE I SC=1.0A VCE=5.0V 35 120 Collector Off State Current I C(OFF) V CE=30V 10 nA Comparator Threshold Voltage V FB Ta=25°C 0°C≤Ta≤70°C 1.225 1.210 1.250 1.275 1.290 V V Threshold voltage Line Regulation REG LINE 3V≤VCC≤30V 0.1 0.3 mV/V Input Bias Current I IB V IN=0V 0.4 1.0 µA Supply Current ICC V IS=VCC, PIN 5>VFB, 5.0V≤VCC≤30V, CT=1nF, PIN 2=GND, Remaining pins open 1.6 3.0 mA

UTC 3563 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R103-013,B TEST CIRCUIT TYPICAL APPLICATION CIRCUIT EFFICIENCY vs OUTPUT CURRENT

UTC 3563 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 5 QW-R103-013,B TYPICAL PERFORMANCE CHARACTERISTICS

UTC 3563 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 6 QW-R103-013,B

APPLICATION INFORMATION

CALCULATION STEP-DOWN STEP-UP tON/tOFF V OUT+VF VIN(MIN)-VSAT-VOUT VOUT+VF-VIN(MIN) VIN(MIN)-VSAT (tON+tOFF)MAX 1/F MIN 1/F MIN CT 4x10 -5tON 4x10 -5tON IC(SWITCH) 2IOUT(MAX) t ON + tOFF 2IOUT(MAX)( ) t OFF RS 0.3/I C(SWITCH) 0.3/I C(SWITCH) L(MIN) VIN(MIN)-VSAT-VOUT ( ) t ON(MAX) I C(SWITCH) VIN(MIN) - VSAT ( ) t ON(MAX) I C(SWITCH) Co IC(SWITCH) (tON+tOFF) 8VRIPPLE(P-P) IOUT tON VRIPPLE(P-P) VSAT : Saturation voltage of the output switch VF : Forward voltage of the ringback rectifier The following power supply characteristics must be chosen: VIN : Norminal input voltage VOUT : Desired output voltage, VOUT=1.25(1+RB/RA) IOUT : Desired output current FMIN : Minimum desired switching frequency at selected values for VIN AND IOUT VRIPPLE(P-P) : Desired peak-to-peak output ripple voltage. In practice, the calculated value will need to be increased due to the capacitor equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the line and load regulation. APPLICATION EXAMPLES Fig. 1 Simplified Battery Charge Circuit for Ni-Cd/Ni-MH Battery

UTC 3563 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 7 QW-R103-013,B Fig.2 Battery Charge Circuit for Fluctuating Charging Current Applications Fig. 3 Step-Down Converter Line regulation: 40mV (VIN=10V~20V, @IO=1A) Load regulation: 20mV (VIN=15V, @IO=100mA~1A) Short circuit current: 1.3A (VIN=15V, @RL=0.1Ω)

UTC 3563 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 8 QW-R103-013,B Fig. 4 Step-Down Converter with External 5V Bootstrap Fig. 5 Step-Up Converter Line regulation: 100mV (VIN=8V~16V, @Io=200mA) Load regulation: 40mV (VIN=12V, @IO=80mA~200mA)

UTC 3563 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 9 QW-R103-013,B Fig. 6 Step-Up Converter with External NPN Switch Fig. 7 Inverting Converter Line regulation: 20mV (VIN=4.5V~6V, @IO=100mA) Load regulation: 100mV (VIN=5V, @IO=10mA~100mA)

UTC 3563 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 10 QW-R103-013,B 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.