UNISONIC TECHNOLOGIES CO., LTD
U9751B
DOUBLE CHANNELS PWM
CONTROLLER
SOP-16
LINEAR INTEGRATED CIRCUIT
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
* I
SINK
=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
DIP-16
SOP-16
SOP-16
SSOP-16
SSOP-16
Packing
Tube
Tape Reel
Tube
Tape Reel
Tube
U9751BL-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
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Copyright © 2005 Unisonic Technologies Co., Ltd
1 of 6
QW-R103-034,A
U9751B
PIN CONFIGURATION
C
T
R
T
EA1+
EA1-
FB1
DTC1
OUT1
GND
1
2
3
4
5
6
7
8
LINEAR INTEGRATED CIRCUIT
16
15
14
13
12
11
10
9
V
REF
SCP
EA2+
EA2-
FB2
DTC2
OUT2
V
CC
PIN DESCRIPTION
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NAME
C
T
R
T
EA1+
EA1-
FB1
DTC1
OUT1
GND
V
CC
OUT2
DTC2
FB2
EA2-
EA2+
SCP
V
REF
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
2 of 6
QW-R103-034,A
U9751B
BLOCK DIAGRAM
12
LINEAR INTEGRATED CIRCUIT
16
15
14
13
11
10
9
Iscp
R
S
PWM
COMP
UVLO
Shutdown
+
-
+
Oscillator
1
2
3
4
UNISONIC TECHNOLOGIES CO., LTD
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+
-
1.2V V
REF
PWM
COMP
+
-
Reference
Voltage
5
6
7
8
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QW-R103-034,A
U9751B
ABSOLUTE MAXIMUM RATINGS
PARAMETER
LINEAR INTEGRATED CIRCUIT
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
V
CC
=6V, f=200kHz (unless otherwise specified)
PARAMETER
SYMBOL
Reference section
Internal Reference Voltage
V
REF
V
REF
Regulation with V
CC
△
V
REF
V
REF
Regulation with I
O(REF)
△
V
REF
V
REF
Regulation with Temperature
Short-Circuit Output Current
I
O(SC)
Undervoltage Lockout Section
threshold Voltage(V
CC
)
V
THR
Short-Circuit Protection Control Section
SCP Input Threshold Voltage
V
I(THR)
SCP Comparator Threshold Voltage
V
COM(THR)
SCP Standby Voltage
V
STN-BY
SCP Latched Input voltage
V
I(LTH)
Input (Source) Current
I
I(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
Input Threshold Voltage at f=10kH
Z
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
△f/△T
TEST CONDITIONS
I
OUT
=1mA
V
CC
=3.6V ~ 40V
I
OUT
= 0.1mA to 1mA
T
A
=-20℃~ 25
℃
T
A
=25
℃
~ 85℃
V
OUT
=0
I
O(REF)
= 0.1mA,T
A
=25℃
T
A
= 25℃
No pull-up
No pull-up
V
IN
=0.7V, T
A
=25℃
C
T
=220pF, R
T
=10K
C
T
=220pF, R
T
=10K
V
CC
=3.6V to 40V
T
A
=-20℃
~
25℃
T
A
=25℃
~
85℃
I
OUR
（
DTC
）
=40µA
Zero duty cycle
Maximum duty cycle
T
A
=25℃
V
O(FB)
=1.25V
V
CC
=3.6V to 40 V
1.9
1.75
1.3
MIN
2.40
TYP
2.46
3.5
2
-0.1%
-0.2%
22
2.8
1.3
1.26
MAX
2.53
UNIT
V
mV
mV
18
2.5
1.2
±1%
±1%
30
3.2
1.5
220
200
-2.5
mA
V
V
V
mV
mV
µA
KH
Z
110
77
-1.5
-2.0
400
10%
1%
-0.4%
-0.2%
±2%
±2%
V
V
I(LTH)
V
I(THR)
I
I(BIAS)
I
SOURCE
V
I(OFF)
V
I(CM)
V
O(POS)
V
O(NEG)
I
I(OFF)
1.95
1.45
0.2
-620
2.15
1.7
1
V
µA
µA
mV
V
V
V
nA
0.3
V
REF
-0.2
±6
1.6
1
±100
V
O(FB)
=1.25V
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4 of 6
QW-R103-034,A
U9751B
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
Input Threshold Voltage at f=10kHz
Total Device
Standby Supply Current
Average Supply Current
SYMBOL
I
I(BIAS)
I
O(SINK)
I
O(SOURCE)
CMRR
G
VO
GB
W
V
O(SAT)
I
O(SC)
I
O(OFF)
V
I(THR)
I
STN-BY
I
AVE
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS
V
O(FB)
=1.25V
V
I(DIFF)
=-0.1V,V
OUT
=1.25V
V
I(DIFF)
=0.1V,V
OUT
=1.25V
R
F
=200KΩ
MIN
1
-45
60
70
TYP
160
4.0
-90
80
80
1.5
0.7
450
MAX
500
UNIT
nA
mA
µA
dB
dB
MH
Z
V
mA
µA
V
mA
mA
I
OUT
=10mA
V
OUT
=6V
V
OUT
=50V
Zero duty cycle
Maximum duty cycle
Off-state
R
T
=10K
1.75
1.3
1
10
1.95
1.45
1.7
2.0
2.15
1.8
2.6
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QW-R103-034,A
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