Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UPS4602
LINEAR INTEGRATED CIRCUIT
HIGH PERFORMANCE CURRENT
MODE POWER SWITCH WITH
ZERO CURRENT DETECTION
„
DESCRIPTION
The UTC UPS4602 is an integrated PWM controller and
PowerMOSFET specifically designed for switching operation with
minimal external components. The UTC UPS4602 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 , Slope
Compensation ,Over Current Protection (OCP), Over Voltage Protection
(OVP), Over Load Protection (OLP), Under Voltage Lock Out (UVLO),
Short Circuit Protection (SCP) , Over Temperature Protection (OTP),
etc. IC will be shutdown or can auto-restart in situations.
„
DIP-8
FEATURE
* Internal PowerMOSFET (650V)
* Programming Gate Driver Capability
* Frequency hopping for Improved EMI Performance.
* Lower than 0.3W Standby Power Design
* Linearly decreasing frequency to 26KHz during light load
* Internal Soft start
* Internal Slope Compensation
* Constant Power Limiting for universal AC input Range
* Gate Output Maximum Voltage Clamp(15V)
* Over temperature protection
* Overload protection
* Over voltage protection
* Leading edge blanking
* Cycle-by-Cycle current limiting
* Under Voltage Lock Out
* Short Circuit Protection
„
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UPS4602L-D08-T
UPS4602G-D08-T
UPS4602L-D08-T
Package
Packing
DIP-8
Tube
(1)Packing Type
(1) T: Tube
(2)Package Type
(2) D08: DIP-8
(3)Lead Free
(3) G: Halogen Free, L: Lead Free
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Copyright © 2011 Unisonic Technologies Co., Ltd
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UPS4602
„
„
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
VCC-G
1
8
GND
VCC
2
7
GND
FB
3
6
DRAIN
CS
4
5
DRAIN
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
PIN NAME
VCC-G
VCC
FB
CS
DRAIN
DRAIN
GND
GND
DESCRIPTION
Supply voltage
Supply voltage
Feedback
Current sense input
Power MOSFET drain
Power MOSFET drain
Ground
Ground
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UPS4602
„
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
Notes: OLP (Over Load Protection)
OVP (Over Voltage Protection)
OTP (Over Temperature Protection)
OCP (Over Current Protection)
UVLO (Under Voltage Latch-Out)
LEB (Led Edge Blanking)
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LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING (Ta=25°C, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
30
V
Input Voltage to FB Pin
VFB
-0.3 ~ 6.5
V
Input Voltage to CS Pin
VCS
-0.3 ~ 6.5
V
Junction Temperature
TJ
+150
°C
Operating Temperature
TOPR
-40 ~ +125
°C
Storage Temperature
TSTG
-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
Supply Voltage
SYMBOL
VCC
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RATINGS
8.6 ~ 22
UNIT
V
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LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (Ta=25°C, VCC=15V, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
SUPPLY SECTION
Start Up Current
IST
VCC = VTHD(ON)-1V
Supply Current with switch
IOP
VFB= 4V
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold Voltage
VTHD(ON)
Min. Operating Voltage
VCC(MIN)
Hysteresis
VCC(HY)
INTERNAL VOLTAGE REFERENCE
Reference Voltage
VREF
Guarantee by design
CONTROL SECTION
Feedback Source Current
IFB
VFB=0
VFB Operating Level
VFBMAX
Burst-Mode Out FB Voltage
VFB(OUT) VCS =0
Reduce-Frequency end FB Voltage
VFB(END) VCS =0
Burst-Mode Enter FB Voltage
VFB(IN)
VCS =0
Normal initial
VFB = 4V
Switching frequency
F(SW)
Power-Saving
Before enter burst mode
Duty Cycle
DMAX
VFB=4V, VCS=0
Frequency Hopping
FJ(SW)
Frequency Variation VS VCC Deviation
FDV
VCC=10 to 20V
Frequency Variation VS Temperature Deviation
FDT
T=-25 to 105°C
Soft-Start Time
TSOFTS
PROTECTION SECTION
OVP threshold
VOVP
VFB=4V
OLP threshold
VFB(OLP) VCS=0
CFB=47nF(From VFB=3.7V
Delay Time Of OLP
TD-OLP
to Drain OFF)
OTP Threshold
T(THR)
CURRENT LIMITING SECTION
Leading Edge Blanking Time
tLEB
Peak Current Limitation
VCS
VFB=4V
Threshold Voltage For Valley
VSENSE-L VFB=4V
POWER MOS-TRANSISTOR SECTION
Drain-Source Breakdown Voltage
VDSS
VGS=0V, ID=250μA
Turn-on voltage between gate and source
VTH
VDS=VGS, ID=250μA
Drain-Source Diode Continuous Source Current
IS
Static Drain-Source On-State Resistance
RDS(ON) VGS=10V,ID=2.25A
VDD =300V, ID =4.0A
Rise Time
tR
RG=25Ω (Note 1,2)
Fall Time
tF
Notes: 1. Pulse Test: Pulse width≤300μs, Duty cycle≤2%
2. Essentially independent of operating temperature
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MIN
TYP
MAX
UNIT
22
8
45
10
μA
mA
13.5
7.5
14.2
8.2
6
15
9
V
V
V
6.3
6.5
6.7
V
1.1
3.5
45
20
64
±2.5
2
1.1
1.2
0.9
50
72
±4
4
55
30
80
±5.5
5
5
6
23
3.7
mA
V
V
V
V
kHz
kHz
%
kHz
%
%
ms
V
V
35
65
95
120
135
155
°C
270
0.88
350
0.95
0.75
450
1.03
nS
V
V
650
2
ms
4
2
5
V
V
A
Ω
45
100
ns
35
80
ns
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FUNCTIONAL DESCRIPTION
The internal reference voltages and bias circuit work at VCC> VTHD(ON), and shutdown at VCC<VCC(MIN).
(1) Soft-Start
When every IC power on, driver output duty cycle will be decided by inter-slope voltage VSOFTS and VCS on
current sense resistor at beginning. After the whole soft-start phase end, and driver duty cycle depend on VFB and
VCS. The relation among VSOFTS, VFB and VOUT as followed FIG.3. Furthermore, soft-start phase should end before
VCC reach VCC(MIN) during VCC power on. Otherwise, if soft-start phase remain not end before VCC reach VCC(MIN)
during VCC power on, IC will enter auto-restart phase and not set up VOUT.
FIG.3 Soft-start phase
(2) Switching Frequency Set
The maximum switching frequency is set to 50kHz. Switching frequency is modulated by output power POUT
during IC operating. At no load or light load condition, most of the power dissipation in a switching mode power
supply is from switching loss on the MOSFET transistor, the core loss of the transformer and the loss on the snubber
circuit. The magnitude of power loss is in proportion to the number of switching events within a fixed period of time.
So lower Switching frequency at lower load, which more and more improve IC’s efficiency at light load. At from no
load to light load condition, The IC will operate at from Burst mode to Reducing Frequency Mode. The relation curve
between fSW and POUT/POUT(MAX) as followed FIG.4.
FIG.4 The relation curve between fSW and relative output power POUT/ POUT(MAX)
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FUNCTIONAL DESCRIPTION(Cont.)
(3) Internal Synchronized Slope Compensation
Built-in slope compensation circuit adds voltage ramp onto the current sense input voltage for PWM
generation, this greatly improves the close loop stability at CCM and prevents the sub-harmonic oscillation and thus
reduces the output ripple voltage.
(4) Frequency Hopping For EMI Improvement
The Frequency Hopping is implemented in the IC; there are two oscillators built-in the IC. The first oscillator
is to set the normal switching frequency; the switching frequency is modulated with a period signal generated by the
2nd oscillator. The relation between the first oscillator and the 2nd oscillator as followed FIG.5. So the tone energy is
evenly spread out, the spread spectrum minimizes the conduction band EMI and therefore eases the system design
in meeting stringent EMI requirement.
FIG.5 Frequency Hopping
(5) Constant Output Power Limit
When the primary current, across the primary wind of transfer, reaches the limit current, around 1.2A, the output
GATE drive will be turned off after a small propagation delay tD. This propagation delay will introduce an additional
current proportional to tD×VIN/Lp. Since the propagation delay is nearly constant regardless of the input line voltage
VIN. Higher input line voltage will result in a larger additional current and hence the output power limit is also higher
than that under low input line voltage. To compensate for this output power limit variation across a wide AC input
range, the threshold voltage is adjusted by adding a positive ramp. This ramp signal rises from 0.75V to 0.95V, and
then flattens out at 0.95V. A smaller threshold voltage forces the output GATE drive to terminate earlier. This
reduces the total PWM turn-on time and makes the output power equal to that of low line input. This proprietary
internal compensation ensures a constant output power limit for a wide AC input voltage range (90VAC to 264VAC).
(6) Protection section
The IC takes on more protection functions such as OLP, 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, VCC power on and driver is
reset after VCC power on again.
OLP
After power on, IC will shutdown driver if over load state occurs for continual TD-OLP. OLP case as followed FIG.6.
The test circuit as followed FIG.8. TD-OLP≈2CFB/1.4.
OVP
OVP will shutdown the switching of the power MOSFET whenever VCC>VOVP. The OVP case as followed FIG.7.
the test circuit as followed FIG.9.
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LINEAR INTEGRATED CIRCUIT
FUNCTIONAL DESCRIPTION(Cont.)
„
FIG.6 OLP case
VDRAIN
500Ω/1W
15V
VCC
IC3
8
1
470u
FIG.7 OVP case
2
33n
7
47nF
3
6
4
5
t
VFB
UPS4602
5.6V
3V
0
TD-OLP
t
VCC
VTHD(ON)
0
t
FIG.8 OLP test circuit
FIG.9 OVP test circuit
OTP
OTP will shut down driver when junction temperature TJ>T(THR) for continual a blanking time.
(7) 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.
(8) Inside power switch MOS transistor
Specific power MOS transistor parameter is as “POWER MOS TRANSISTOR SECTION” in electrical
characteristics table.
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LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
YC1
C8
R6
LINE
F1
L1
XC1
ZNR1
R1
R2
1
2 4
3
4
BD1
3
T1
10
R3
1
C1
2
C2
12V/1.33A
D2
C10
C4
9
R5
L2
1
2
16W
3
NEUT
GND
4
D1
R7
2
RG
VCC
1
D3
8
7
C3
IC1
6
DRAIN
5
DRAIN
6
R17
VCC-G
R14
R10
IC2
FB
GND GND
8
7
3
CS
4
RCS
4
1
3
2
C9
R8
IC3
C7
R9
FIG.10 UTC UPS4602 Typical Application Circuit
Table1. Components reference description for UTC UPS4602 application circuit
DESIGNATOR
C1
C2
C3
C4
C7
C8
C9
C10
PART TYPE
33μF
0.001μF
22μF
470μF
0.01μF
0.001μF
0.1μF
470μF
DESIGNATOR
R1
R2
R3
R5
R6
R7
R8
R9
R10
R14
R17
RG
RCS
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PART TYPE
2.2MΩ
2.2MΩ
100KΩ
2MΩ
30Ω
15Ω
4.7KΩ
3.92KΩ
15KΩ
1.8KΩ
510Ω
0Ω
1Ω
DESIGNATOR
D1
D2
D3
IC1
IC2
IC3
YC1
T1
L1
L2
F1
ZNR1
XC1
BD1
PART TYPE
RS1M
SR39
RS1D
UPS4602
PC-817
TL431
102P/400V
EE22
UU9.8
2μH
1A/250V
7D471K
0.1μF/250V
KBP205
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LINEAR INTEGRATED CIRCUIT
Frequency(KHz)
Input Power (mW)
TYPICAL CHARACTERISTICS
„
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.
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