UNISONIC TECHNOLOGIES CO., LTD
UCSR3651S
HIGH PRECISION CC/CV
PRIMARY-SIDE PWM POWER
SWITCH
DESCRIPTION
DIP-7
CMOS IC
The UTC
UCSR3651S
is a primary control switch mode charger
and adapter applications. The controlled variable is transferred by
an auxiliary winding from the secondary to the primary side. The
device integrates PWM controller to enhance the performance of
discontinuous conduction mode (DCM) flyback converters.
The UTC
UCSR3651S
operates in primary-side sensing and
regulation. Opto-coupler and TL431 could be eliminated. It also
provides off-time modulation to linearly decrease PWM frequency
under light-load conditions so that low standby power can be
achieved.
The UTC
UCSR3651S
achieves high precision CV/CC
regulation and high power efficiency. It offers comprehensive
protection coverage with auto-recovery features including
Cycle-by-cycle current limiting, V
DD
over voltage protection, V
DD
clamp, OTP, leading edge blanking, V
DD
under voltage lockout, etc.
SOP-8
FEATURES
* Built-in leading edge blanking
* Built-in primary winding inductance
compensation
* Power on soft start
* Gate Output Maximum Voltage Clamped at
15V
* Cycle-by-cycle current limiting
* Over voltage protection
* V
DD
under-voltage lockout
* High Voltage startup circuit
* Built-in 600V Power MOSFET
* ±5% constant voltage regulation at universal AC input
* High precision constant current regulation at universal AC input
* Primary side control without TL431 and opto-coupler
* Programmable CV and CC regulation
* Programmable cable compensation in CV mode
* Flyback topology in DCM operation
* Frequency hopping to reduce system EMI
ORDERING INFORMATION
Ordering Number
Lead Free
UCSR3651SL-D07-T
-
Halogen Free
UCSR3651SG-D07-T
UCSR3651SG-S08-T
Package
DIP-7
SOP-8
Packing
Tube
Tape Reel
UCSR3651SL-D07-T
(1)Packing Type
(2)Package Type
(3)Green Package
(1) T: Tube, R: Tape Reel
(2) D07: DIP-7, S08: SOP-8
(3) L: Lead Free, G: Halogen Free and Lead Free
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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QW-R129-010.A
UCSR3651S
ABSOLUTE MAXIMUM RATING
CMOS IC
PARAMETER
SYMBOL
RATINGS
UNIT
Drain Voltage (Off State)
B
VDSS
-0.3~Bvdss
V
V
DD
Zener Clamp Continuous Current
I
DD
10
mA
COMP Voltage
V
COMP
-0.3~7
V
CS Input Voltage
V
CS
-0.3~7
V
INV Input Voltage
V
INV
-0.3~7
V
Operating Junction Temperature
T
J
-20~150
°C
Storage Temperature
T
STG
-55~150
°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.
THERMAL CHARACTERISTICS
PARAMETER
SYMBOL
DIP-7
SOP-8
θ
JA
RATINGS
75
90
UNIT
°C/W
°C/W
Junction to Ambient
OUTPUT POWER TABLE
PARAMETER
230VAC±15%
85-264VAC
RATINGS
10
8
UNIT
W
W
Adapter (Note 1)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 9
QW-R129-010.A
UCSR3651S
ELECTRICAL CHARACTERISTICS
(T
A
=25°C, V
DD
=15V, unless otherwise specified)
SYMBOL
V
ST
I
ST
V
TH(ON)
V
TH(OFF)
V
DD_OVP
I
DD-OP
I
DD-GREEN
f
OSC
f
OSC-CM-MIN
f
OSC-N-MIN
∆f
f
req
TEST CONDITIONS
V
DD
<V
TH(ON)
V
DD
<V
TH(ON)
PARAMETER
STARTUP SECTION
Startup Voltage
Startup Current
SUPPLY SECTION
Turn-on Threshold Voltage
Turn-off Threshold Voltage
V
DD
OVP Protection
Operating Current
Green-Mode Operating Current
OSCILLATOR SECTION
Maximum Frequency
Minimum Frequency at CCM
Minimum Frequency at No-load
Frequency Hopping Range
CMOS IC
MIN TYP MAX UNIT
25
700
13.5 14.5 16
8.2
9
10.5
28
1.6
2
1.3
55
65
17
300
±5.0
75
V
μA
V
V
V
mA
mA
kHz
kHz
Hz
%
Frequency Hopping Period
t
FHR
3
ms
INV SECTION
Reference Voltage for EA
V
VR
1.97 2.00 2.03
V
Reference Voltage for CCM
V
VR_CCM
0.5
V
Max. Cable Compensation Current
I
CABLE_MAX
37
μA
CURRENT SENSE SECTION
Current Sense Threshold Voltage
V
CS
870 900 930
mV
OCP Propagation Delay
t
D_OC
90 200
nS
Leading Edge Blank Time
t
LEB
900
nS
Soft Start Time
t
SS
10
mS
POWER MOSFET SECTION
MOSFET DS Breakdown Voltage
B
VDSS
600
V
On Resistance
R
DS(ON)
3
Ω
OTP SECTION
Threshold Temperature of OTP (Note 2)
T
OTP
+140
°C
Notes: 1. Maximum practical continuous power in an Adapter design with sufficient drain pattern as a heat sink, at
50°C ambient.
2. When the over-temperature protection is activated, the power system enters auto restart mode and output
is disabled.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R129-010.A
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