UNISONIC TECHNOLOGIES CO., LTD
US1702
Preliminary
LINEAR INTEGRATED CIRCUIT
HIGH PERFORMANCE
CURRENT MODE POWER
SWITCH
DESCRIPTION
DIP-8
The UTC
US1702
is an integrated PWM controller and Power
MOSFET specifically designed for current mode operation with
minimal external components. The UTC
US1702
is designed to
provide several special enhancements to satisfy the needs, for
example, Power-Saving mode for low standby power (<0.3W),
Frequency Hopping , Constant Output Power Limiting , Over
Current Protection (OCP), Over Voltage Protection (OVP), Under
Voltage Lock Out (UVLO), and Over Temperature Protection
(OTP) etc. IC will be shutdown or can auto-restart in certain
situations.
FEATURE
* Internal High Voltage Start-up Circuit
* Internal 700V Power MOSFET
* Lower than 0.3W Standby Power Design
* Gate Output Maximum Voltage Clamp(15V)
* Over temperature protection
* Over voltage protection
* Leading edge blanking
* Cycle-by-Cycle current limiting
* Under Voltage Lock Out
ORDERING INFORMATION
Ordering Number
Lead Free
US1702L-D08-T
Halogen Free
US1702G-D08-T
Package
DIP-8
Packing
Tube
MARKING
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
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US1702
PIN CONFIGURATION
Preliminary
LINEAR INTEGRATED CIRCUIT
GND 1
GND 2
FB
V
CC
3
4
8
7
6
5
Drain
Drain
Drain
Drain
PIN DESCRIPTION
PIN NO.
1、2
3
4
5~8
PIN NAME
GND
FB
V
CC
Drain
DESCRIPTION
Ground
Feedback
Supply voltage
Power MOSFET drain
BLOCK DIAGRAM
Notes: OTP (Over Temperature Protection)
OVP (Over Voltage Protection)
OCP (Over Current Protection)
UVLO (Under Voltage Latch-Out)
LEB (Led Edge Blanking)
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US1702
Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
(T
A
=25°C, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Switching Drain Source Voltage
V
DS(SW)
700
V
Supply Voltage
V
CC
30
V
Feedback Current
I
FB
3
mA
Junction Temperature
T
J
+150
°C
Operating Temperature
T
OPR
-40 ~ +125
°C
Storage Temperature
T
STG
-50 ~ +150
°C
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.
OPERATING RANGE
PARAMETER
SYMBOL
V
CC
RATINGS
8.6 ~ 22
UNIT
V
Supply Voltage
ELECTRICAL CHARACTERISTICS
(T
A
＝25°C,
V
CC
=15V, unless otherwise specified)
SYMBOL
I
CH
I
ST
I
OP
V
CCON
V
CCOFF
TEST CONDITIONS
V
DS
=100V, V
CC
=0~V
CCON
V
CC
= V
CCON
-0.2V
I
FB
=0.5mA, I
D
=50mA
13.5
8
MIN
TYP
MAX
1
45
6.5
16.5
10
UNIT
mA
μA
mA
V
V
PARAMETER
SUPPLY SECTION
Start Up Charge Current
Start Up Current
Supply Current with switch
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold Voltage
Min. Operating Voltage
INTERNAL VOLTAGE REFERENCE
CONTROL SECTION
I
FB
to I
D
Current Gain
Feedback Source Shutdown Current
FB Pin Input Impedance
Burst-Mode Out FB Voltage
Burst-Mode Enter FB Voltage
Normal initial Switching frequency
Frequency Deviation VS V
CC
Frequency Deviation VS Temperature
PROTECTION SECTION
OVP threshold
OTP threshold
CURRENT LIMITING SECTION
Peak Current Limitation
Minmum Turn On Time
POWER MOSFET SECTION
Drain-Source Breakdown Voltage
Turn-on voltage between gate and source
Off State Drain Current
Static Drain-Source On-State Resistance
Rise Time
6
2
15
9
G
FB-D
I
FBSD
R
FB
V
FB(OUT)
V
FB(IN)
F
(SW)
F
DV
F
DT
V
OVP
T
(THR)
I
LIM
t
ON(MIN)
V
DSS
V
TH
I
DSS
R
DS(ON)
t
R
54
V
CC
=10 to 22V
T
A
=-40 to 105°C
560
900
1200
0.94
1.05
60
66
5
5
μA
Ω
V
V
kHz
%
%
V
°C
A
nS
V
V
uA
Ω
ns
ns
pF
130
V
FB
=0V
0.56
23
150
0.7
680
170
0.84
V
FB
=2V, I
D
=250μA
V
DS
=V
GS
, I
D
=250μA
V
DS
=500V, V
FB
=2V
V
GS
=10V,I
D
=0.4A
V
DD
=300V, I
D
=4.0A
RG=25Ω (Note 1, 2)
700
2
4
100
5
45
35
40
100
80
Fall Time
t
F
Drain Capacitance
C
OSS
V
DS
=25V
Notes: 1. Pulse Test: Pulse width≤300μs, Duty cycle≤2%
2. Essentially independent of operating temperature
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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US1702
Preliminary
LINEAR INTEGRATED CIRCUIT
FUNCTIONAL DESCRIPTION
The internal reference voltages and bias circuit work at V
CC
> V
THD(ON)
, and shutdown at V
CC
<V
CC(MIN)
.
(1) High Voltage Start up switch Circuit
At startup, an internal high-voltage current source supplies the internal bias and charges the external capacitor
connected to the V
CC
pin. When V
CC
reaches V
THD (ON)
, the IC begins switching and the internal high-voltage current
source is disabled. The IC continues its normal switching operation and the power is supplied from the auxiliary
transformer winding unless V
CC
goes below the stop voltage of V
CC(MIN)
.
(2) Switching Frequency Limit
The UTC
US1702
have a constant switching frequency of 60kHz.
(3) Protection section
The IC takes on more protection functions such as OVP and OTP etc. In case of those failure modes for
continual blanking time, the driver is shut down. At the same time, IC enters auto-restart, V
CC
power on and driver is
reset after V
CC
power on again.
OVP
OVP will shutdown the switching of the power MOSFET whenever V
CC
>V
OVP
. The OVP case as followed Fig. 1
the test circuit as followed Fig. 2.
15V
470u
V
CC
33n
1
2
3
4
UTC
US1702
15V
500Ω
8
7
6
5
V
OVP
V
CC
Drain
470u
V
DD
33n
IC3
Fig.1 OVP case
Fig.2 OVP test circuit
OTP
OTP will shut down driver and latch-off when junction temperature T
J
>T
(THR)
, and IC will be release on when
temperature decreasing under T
(THR)
-30 and powering on again.
(4) The Gain of FB pin to Drain Current Limiting
I
LIM
=G
FB-D
×0.23V×(R2||R1)
(5) Driver Output Section
The driver-stage drives the gate of the MOSFET and is optimized to minimize EMI and to provide high circuit
efficiency. This is done by reducing the switch on slope when reaching the MOSFET threshold. This is achieved by a
slope control of the rising edge at the driver’s output. The output driver is clamped by an internal 15V Zener diode in
order to protect power MOSFET transistors against undesirable gate over voltage.
(6) Inside Power MOSFET
Specific Power MOSFET parameter is as “Power MOSFET SECTION” in electrical characteristics table.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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US1702
Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
YC1
LINE
F1
2
NEUT
BD1
1 B6S
4
3
1 T1 7
C1
L1
C2
C8
D1
D3
C4
R1
5
2
C3
3
FB
4
V
CC
5
6
7
8
IC1
C9
R7
L2
5V/1.6A
C5
C12
GND
10
D2
3
R9
R11
Drain
Source Drain
Drain
Source Drain
R5
IC2
4
3
1
2
R8
C11
R12
C6
2
UTC
US1702
1
IC3
R10
Fig. 3 UTC
US1702
Typical Application Circuit
Table1. Components reference description for UTC US1702 application circuit
DESIGNATOR
C1
C2
C3
C4
C5
C6
C8
C9
C11
C12
PART TYPE
10μF/400V
10μF/400V
10μF/50V
470μF/16V
220μF/16V
103pF
102pF/1KV
102pF/100V
103pF
103pF
DESIGNATOR
R1
R5
R7
R8
R9
R10
R11
R12
PART TYPE
100KΩ
6.8KΩ
30Ω
2.2KΩ
510Ω
5.1KΩ
5.1KΩ
15KΩ
DESIGNATOR
D1
D2
D3
IC1
IC2
IC3
YC1
T1
L1
L2
F1
BD1
PART TYPE
FR107
RS1D
SR39
US1702
PC-817
TL431
102pF/400V
EE-19
1mH
2μH
1A/250V
B6S
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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