U9751B ETL | Alldatasheet
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UNISONIC TECHNOLOGIES CO., LTD U9751B LINEAR INTEGRATED CIRCUIT www.unisonic.com.tw 1 of 6 Copyright © 2005 Unisonic Technologies Co., Ltd QW-R103-034,A DOUBLE CHANNELS PWM CONTROLLER DESCRIPTION The UTC U9751B consists of two PWM control circuits. Two PWM controllers is independent each other. It is low cost in many applications. FEATURES * Switch frequency: 400KHz * ISINK =400mA * Wide work voltage * Programmable dead-time control * UVLO protection * SCP protection * Lower static supply current APPLICATION *DC/DC converters for video camerasabacklight inverter and notebook computers etc. SSOP-16(150mil) DIP-16 SOP-16 *Pb-free plating product number: U9751BL ORDER INFORMATION Order Number Normal Lead Free Plating Package Packing U9751B-D16-T U9751BL-D16-T DIP-16 Tube U9751B-S16-R U9751BL-S16-R SOP-16 Tape Reel U9751B-S16-T U9751BL-S16-T SOP-16 Tube U9751B-R16-R U9751BL-R16-R SSOP-16 Tape Reel U9751B-R16-T U9751BL-R16-T SSOP-16 Tube U9751 BL-D16-R (1)Packing Type (2)Package Type (3)Lead Plating (1) R: Tape Reel, T: Tube (2) D16: DIP-16, S16: SOP-16, R16: SSOP-16 (3) L: Lead Free Plating , Blank: Pb/Sn
U9751B LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 2 of 6 www.unisonic.com.tw QW-R103-034,A PIN CONFIGURATION CT FB1 EA1- EA1+ DTC1 OUT1 GND SCP FB2 EA2- DTC2 OUT2 RT VCC VREF EA2+ PIN DESCRIPTION NO. NAME DESCRIPTION
1 C T Capacitor connected to the pi n controlling Oscillator frequency
2 R T Resistor connected to the pi n controlling Oscillator frequency
3 EA1+ Error Amplifier 1 positive Input
4 EA1- Error Amplifier 1 Inverting Input
5 FB1 Error Amplifier 1 Output, used for feedback output 1
6 DTC1 Dead-Time Comparator Output 1
7 OUT1 Output 1
8 GND Ground
9 V CC Power Supply
10 OUT2 Output 2
11 DTC2 Dead-Time Comparator Output 2
12 FB2 Error Amplifier 2 Output, used for feedback output 2
13 EA2- Error Amplifier 2 Inverting Input
14 EA2+ Error Amplifier 2 positive Input
15 SCP Short Circuit Protection Input
16 V REF Internal 2.5V Reference Voltage
U9751B LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 3 of 6 www.unisonic.com.tw QW-R103-034,A BLOCK DIAGRAM 91016 7 865 15 1314 12 11 Iscp R S UVLO PWM COMP PWM COMP Oscillator 1.2V VREF Reference Voltage 1 2 43 Shutdown
U9751B LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 4 of 6 www.unisonic.com.tw QW-R103-034,A ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNIT Supply Voltage V CC +38 V Differential Input Voltage V I(DIFF) +20 V Output Voltage V OUT +38 V Output Current I OUT +450 mA Maximum Junction Temperature T J +150 ¥ Operating Temperature T OPR -20 ~ +85 ¥ Storage Temperature T STG -55 ~ +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. DC ELECTRONIC CHARACTERISTICS VCC=6V, f=200kHz (unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Reference section Internal Reference Voltage V REF I OUT =1mA 2.40 2.46 2.53 V VREF Regulation with VCC V ¶ REF V CC =3.6V ~ 40V 3.5 mV VREF Regulation with IO(REF) V ¶ REF I OUT = 0.1mA to 1mA 2 mV TA=-20Ċ~ 25 Ċ -0.1% ±1% VREF Regulation with Temperature TA=25 Ċ ~ 85Ċ -0.2% ±1% Short-Circuit Output Current I O(SC) V OUT =0 18 22 30 mA Undervoltage Lockout Section threshold Voltage(VCC) V THR IO(REF) = 0.1mA,TA=25Ċ 2.5 2.8 3.2 V Short-Circuit Protection Control Section SCP Input Threshold Voltage V I(THR) T A= 25Ċ 1.2 1.3 1.5 V SCP Comparator Threshold Voltage V COM(THR) 1.26 V SCP Standby Voltage V STN-BY No pull-up 110 220 mV SCP Latched Input voltage V I(LTH) No pull-up 77 200 mV Input (Source) Current I I(SOURCE) V IN=0.7V, TA=25Ċ -1.5 -2.0 -2.5 µA Oscillator Section Frequency f C T=220pF, RT=10K 400 KH Z Deviation of Frequency ¶f C T=220pF, RT=10K 10% Frequency Regulation with Voltage ¶f/¶V V CC=3.6V to 40V 1% TA=-20Ċ _25Ċ -0.4% ±2% Frequency Regulation with Temperature ¶f/¶T TA=25Ċ _ 85Ċ -0.2% ±2% Dead-time control section Latched Input Voltage V I(LTH) IOURčDTCĎ=40µA 1.9 V Input Bias Current I I(BIAS) 0.2 1 µA Latch Mode (Source) Current I SOURCE T A=25Ċ -620 µA Error-Amplifier Section Input Offset Voltage V I(OFF) V O(FB)=1.25V ±6 mV Common-Mode Input Voltage Range V I(CM) V CC=3.6V to 40 V 0.3 1.6 V Positive Output Voltage Swing V O(POS) V REF-0.2 V Negative Output Voltage Swing V O(NEG) 1 V Input Offset Current I I(OFF) V O(FB)=1.25V ±100 nA
U9751B LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 5 of 6 www.unisonic.com.tw QW-R103-034,A DC ELECTRONIC CHARACTERISTICS(Cont.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Input Bias Current I I(BIAS) V O(FB)=1.25V 160 500 nA Output Sink Current I O(SINK) V I(DIFF)=-0.1V,VOUT=1.25V 1 4.0 mA Output Source Current I O(SOURCE) V I(DIFF)=0.1V,VOUT =1.25V -45 -90 µA Common-Mode Rejection Ratio CMRR 60 80 dB Open-Loop Voltage Gain G VO R F=200KΩ 70 80 dB Unity-Gain Bandwidth GB W 1.5 MH Z Output Section Output Saturation Voltage V O(SAT) I OUT=10mA 0.7 1 V Short-Circuit Output Current I O(SC) V OUT =6V 450 mA Off-State Current I O(OFF) V OUT =50V 10 µA PWM Comparator Section Total Device Standby Supply Current I STN-BY Off-state 1.7 mA Average Supply Current I AVE R T =10K 2.0 2.6 mA
U9751B LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 6 of 6 www.unisonic.com.tw QW-R103-034,A TYPICAL APPLICATION Typical Application R14 R19 C14 R17 1k M2 9435 C13 100uF L3 20uH SCD24 R23 1.21k 1% R22 2k 1% R24 C16 220uF/16V Vout 2 Vout1 C10 220 uF/16V R18 R16 1k M1 9435 C17 100uF L2 20uH SCD24 R21 3.3k 1% R20 10k 1% R25 R15 C15 R13 1k R12 R11 33k CT REF RT SCP EAINV1 EAINV2 EAOUT1 EAOUT 2 FB1 FB2 DTC1 DTC2 OUT1 OUT2 GND VCC IC1 R10 33k C70.02 7uFR9 33 k C20. 33uF 10k 10k C1 2C11 R8R5 UTC U9751B 33k 0.027uF 33k 100uF 33k C1 330pF R4 10k Vin TIMING WAVEFORM H L 1.3V SCP Enabel Output SCP Waveform Output Waveform (H shutdown) Error Amplifier Output CT Waveform H L Timing Diagram 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.