Datasheet

UNISONIC TECHNOLOGIES CO., LTD
U9751B
LINEAR INTEGRATED CIRCUIT
DOUBLE CHANNELS PWM
CONTROLLER
SOP-16
DESCRIPTION
The UTC U9751B consists of two PWM control circuits. Two
PWM controllers is independent each other. It is low cost in many
applications.
DIP-16
FEATURES
* Switch frequency: 400KHz
* ISINK =400mA
* Wide work voltage
* Programmable dead-time control
* UVLO protection
* SCP protection
* Lower static supply current
SSOP-16(150mil)
*Pb-free plating product number: U9751BL
APPLICATION
* DC/DC converters for video cameras、backlight inverter and
notebook computers etc.
ORDER INFORMATION
Order Number
Normal
Lead Free Plating
U9751B-D16-T
U9751BL-D16-T
U9751B-S16-R
U9751BL-S16-R
U9751B-S16-T
U9751BL-S16-T
U9751B-R16-R
U9751BL-R16-R
U9751B-R16-T
U9751BL-R16-T
Package
Packing
DIP-16
SOP-16
SOP-16
SSOP-16
SSOP-16
Tube
Tape Reel
Tube
Tape Reel
Tube
U9751BL-D16-R
(1)Packing Type
(2)Package Type
(3)Lead Plating
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., Ltd
(1) R: Tape Reel, T: Tube
(2) D16: DIP-16, S16: SOP-16, R16: SSOP-16
(3) L: Lead Free Plating, Blank: Pb/Sn
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QW-R103-034,A
U9751B
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
CT
1
16
VREF
RT
2
15
SCP
EA1+
3
14
EA2+
EA1-
4
13
EA2-
FB1
5
12
FB2
DTC1
6
11
DTC2
OUT1
7
10
OUT2
GND
8
9
VCC
PIN DESCRIPTION
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NAME
CT
RT
EA1+
EA1FB1
DTC1
OUT1
GND
VCC
OUT2
DTC2
FB2
EA2EA2+
SCP
VREF
DESCRIPTION
Capacitor connected to the pin controlling Oscillator frequency
Resistor connected to the pin controlling Oscillator frequency
Error Amplifier 1 positive Input
Error Amplifier 1 Inverting Input
Error Amplifier 1 Output, used for feedback output 1
Dead-Time Comparator Output 1
Output 1
Ground
Power Supply
Output 2
Dead-Time Comparator Output 2
Error Amplifier 2 Output, used for feedback output 2
Error Amplifier 2 Inverting Input
Error Amplifier 2 positive Input
Short Circuit Protection Input
Internal 2.5V Reference Voltage
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R103-034,A
U9751B
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
16
15
14
Reference
Voltage
11
12
13
10
9
+
Iscp
R
PWM
COMP
S
UVLO
Shutdown
+
+
1.2V VREF
PWM
COMP
+
-
Oscillator
1
2
3
UNISONIC TECHNOLOGIES CO., LTD
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4
5
6
7
8
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QW-R103-034,A
U9751B
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
+38
V
Differential Input Voltage
VI(DIFF)
+20
V
Output Voltage
VOUT
+38
V
Output Current
IOUT
+450
mA
℃
Maximum Junction Temperature
TJ
+150
℃
Operating Temperature
TOPR
-20 ~ +85
℃
Storage Temperature
TSTG
-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
Reference section
Internal Reference Voltage
VREF
VREF Regulation with VCC
△VREF
VREF Regulation with IO(REF)
△VREF
VREF Regulation with Temperature
Short-Circuit Output Current
IO(SC)
Undervoltage Lockout Section
threshold Voltage(VCC)
VTHR
Short-Circuit Protection Control Section
SCP Input Threshold Voltage
VI(THR)
SCP Comparator Threshold Voltage
VCOM(THR)
SCP Standby Voltage
VSTN-BY
SCP Latched Input voltage
VI(LTH)
Input (Source) Current
II(SOURCE)
Oscillator Section
Frequency
f
Deviation of Frequency
△f
Frequency Regulation with Voltage
△f/△V
Frequency Regulation with Temperature
Dead-time control section
Latched Input Voltage
△f/△T
TEST CONDITIONS
MIN
TYP
MAX
UNIT
2.40
2.53
V
mV
mV
18
2.46
3.5
2
-0.1%
-0.2%
22
±1%
±1%
30
mA
IO(REF) = 0.1mA,TA=25℃
2.5
2.8
3.2
V
TA= 25℃
1.2
1.3
1.26
1.5
110
77
220
200
-2.5
V
V
mV
mV
µA
IOUT =1mA
VCC =3.6V ~ 40V
IOUT = 0.1mA to 1mA
TA=-20℃~ 25℃
TA=25℃ ~ 85℃
VOUT =0
No pull-up
No pull-up
VIN=0.7V, TA=25℃
CT=220pF, RT=10K
CT=220pF, RT=10K
VCC=3.6V to 40V
TA=-20℃ ~ 25℃
TA=25℃ ~ 85℃
VI(LTH)
IOUR(DTC)=40µA
Input Threshold Voltage at f=10kHZ
VI(THR)
Zero duty cycle
Maximum duty cycle
Input Bias Current
Latch Mode (Source) Current
Error-Amplifier Section
Input Offset Voltage
Common-Mode Input Voltage Range
Positive Output Voltage Swing
Negative Output Voltage Swing
Input Offset Current
II(BIAS)
ISOURCE
TA=25℃
VI(OFF)
VI(CM)
VO(POS)
VO(NEG)
II(OFF)
VO(FB)=1.25V
VCC=3.6V to 40 V
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
-1.5
VO(FB)=1.25V
-2.0
400
10%
1%
-0.4%
-0.2%
1.9
1.75
1.3
0.3
VREF-0.2
KHZ
±2%
±2%
V
1.95
1.45
0.2
-620
2.15
1.7
1
±6
1.6
1
±100
V
µA
µA
mV
V
V
V
nA
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QW-R103-034,A
U9751B
LINEAR INTEGRATED CIRCUIT
DC ELECTRONIC CHARACTERISTICS(Cont.)
PARAMETER
Input Bias Current
Output Sink Current
Output Source Current
Common-Mode Rejection Ratio
Open-Loop Voltage Gain
Unity-Gain Bandwidth
Output Section
Output Saturation Voltage
Short-Circuit Output Current
Off-State Current
PWM Comparator Section
SYMBOL
II(BIAS)
IO(SINK)
IO(SOURCE)
CMRR
GVO
GBW
TEST CONDITIONS
VO(FB)=1.25V
VI(DIFF)=-0.1V,VOUT=1.25V
VI(DIFF)=0.1V,VOUT =1.25V
RF=200KΩ
VO(SAT)
IO(SC)
IO(OFF)
IOUT=10mA
VOUT =6V
VOUT =50V
Input Threshold Voltage at f=10kHz
VI(THR)
Zero duty cycle
Maximum duty cycle
Total Device
Standby Supply Current
Average Supply Current
ISTN-BY
IAVE
Off-state
RT =10K
UNISONIC TECHNOLOGIES CO., LTD
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MIN
1
-45
60
70
TYP
160
4.0
-90
80
80
1.5
MAX
500
UNIT
nA
mA
µA
dB
dB
MHZ
0.7
450
1
V
mA
µA
10
1.75
1.3
1.95
1.45
1.7
2.0
2.15
1.8
2.6
V
mA
mA
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QW-R103-034,A
U9751B
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION
Vin
R10 33k
C3
100uF
R2
33k
IC1
C1 330pF
R1
33k
R4 10k
C4
R3
C6
33k 0.027uF
CT
REF
RT
SCP
FB1
FB2
EAINV1
EAINV2
EAOUT1
EAOUT 2
DTC1
DTC2
OUT1
OUT2
GND
C20.33uF
C5
R9 33k C7 0.027uF
R13
1k
R12
C8
Q1
C17
100 uF
L2 20uH
M1
9435
VCC
UTC U9751 B
Q2
R8
R5
R16
1k
C12
C11
R6
10k
D1
SCD24
R18
Vout1
R20
10k 1 %
R25
C10
220 uF/16 V
R21 C9
3.3k 1%
R11
33 k
R7
10k
R15
1k
C14
Q3
R14
Q4
R17
1k
M2
9435
C13
100 uF
L3 20uH
Vout 2
R22
2k 1%
R19
D2
SCD24
R23 C15
1.21 k 1%
R24
C16
220 uF/16 V
Typical Application
TIMING WAVEFORM
Error Amplifier Output
CT Waveform
Output Waveform
(H shutdown)
H
L
1.3V
SCP Waveform
0V
H
SCP Enabel Output
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R103-034,A
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