UCC28C42MDEP [TI]
IC,SMPS CONTROLLER,CURRENT-MODE,BICMOS,SOP,8PIN,PLASTIC;
| 型号： | UCC28C42MDEP |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | IC,SMPS CONTROLLER,CURRENT-MODE,BICMOS,SOP,8PIN,PLASTIC 信息通信管理 光电二极管 |
| 文件： | 总19页 (文件大小：357K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UCC28C4x-EP
BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
www.ti.com
SGLS352A–DECEMBER 2006–REVISED JANUARY 2007
FEATURES
•
•
•
Trimmed Oscillator Discharge Current
New Undervoltage Lockout Versions
MSOP-8 Package Minimizes Board Space
•
Controlled Baseline
–
–
One Assembly/Test Site, One Fabrication
Site
APPLICATIONS
Extended Temperature Performance of
•
•
•
Switch-Mode Power Supplies
DC-to-DC Converters
Board Mount Power Modules
–55°C to 125°C
•
Enhanced Diminishing Manufacturing Sources
(DMS) Support
•
•
•
Enhanced Product-Change Notification
DESCRIPTION
(1)
Qualification Pedigree
The UCC28C4x family are high-performance
current-mode PWM controllers. They are enhanced
BiCMOS versions with pin-for-pin compatibility to the
industry standard UC284xA family and UC284x
family of PWM controllers. In addition, lower startup
voltage versions of 7 V are offered as UCC28C40
and UCC28C41.
Enhanced Replacements for UC2842A Family
With Pin-to-Pin Compatibility
•
•
•
•
1-MHz Operation
50-µA Standby Current, 100-µA Maximum
Low Operating Current of 2.3 mA at 52 kHz
Fast 35-ns Cycle-by-Cycle Overcurrent
Limiting
Providing
necessary
features
to
control
fixed-frequency, peak current-mode power supplies,
this family offers several performance advantages.
These devices offer high-frequency operation up to
1 MHz with low start-up and operating currents, thus
minimizing start-up loss and low operating power
consumption for improved efficiency. The devices
also feature a fast current-sense-to-output delay time
of 35 ns, and a ±1-A peak output current capability
with improved rise and fall times for driving large
external MOSFETs directly.
•
•
±1-A Peak Output Current
Rail-to-Rail Output Swings With 25-ns Rise
and 20-ns Fall Times
•
±1% Initial Trimmed 2.5-V Error Amplifier
Reference
(1) Component qualification in accordance with JEDEC and
industry standards to ensure reliable operation over an
extended temperature range. This includes, but is not limited
to, Highly Accelerated Stress Test (HAST) or biased 85/85,
temperature cycle, autoclave or unbiased HAST,
electromigration, bond intermetallic life, and mold compound
life. Such qualification testing should not be viewed as
justifying use of this component beyond specified
performance and environmental limits.
The UCC28C4x family is offered in 8-pin package
SOIC (D).
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2006–2007, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
UCC28C4x-EP
BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
www.ti.com
SGLS352A–DECEMBER 2006–REVISED JANUARY 2007
AVAILABLE OPTIONS
SOIC-8
MAXIMUM
DUTY CYCLE
UVLO
ON/OFF
TA
SMALL OUTLINE
(D)(1)
14.5 V/9 V
8.4 V/7.6 V
7 V/6.6 V
UCC28C42MDREP(2)
UCC28C43MDREP
UCC28C40MDREP(2)
UCC28C44MDREP(2)
UCC28C45MDREP
UCC28C41MDREP(2)
100%
50%
–55°C to 125°C
14.5 V/9 V
8.4 V/7.6 V
7 V/6.6 V
(1) D (SOIC-8) packages are available taped and reeled. Add R suffix to device type (e.g., UCC28C42DREP) to order quantities of 2500
devices per reel. Tube quantities are 75 for D packages (SOIC-8).
(2) Product Preview
FUNCTIONAL BLOCK DIAGRAM
Note: Toggle flip-flop used only in UCC28C41, UCC28C44, and UCC28C45.
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BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
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SGLS352A–DECEMBER 2006–REVISED JANUARY 2007
Absolute Maximum Ratings(1)(2)
over operating free-air temperature range (unless otherwise noted)
MIN
MAX
20
UNIT
V
VDD
Supply voltage
Max ICC
30
mA
A
Output current, IOUT peak
Output energy, capacitive load
COMP, CS, FB
±1
5
µJ
–0.3
–0.3
–0.3
6.3
20
OUT
Voltage rating
RT/CT
V
6.3
7
VREF
Error amplifier output sink current
Operating junction temperature range(3)
10
mA
°C
°C
°C
TJ
–55
–65
150
150
300
Tstg
Storage temperature range
Lead temperature (soldering, 10 s)
(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltages are with respect to ground. Currents are positive into and negative out of the specified terminals.
(3) Long-term high temperature storage and/or extended use at maximum recommended operating conditions may result in a reduction of
overall device life. See http://www.ti.com/ep_quality for additional information about enhanced plastic packaging.
Dissipation Ratings
θja
(°C/W)
176
TA < 25°C
POWER RATING
710 mW
DERATING FACTOR
ABOVE TA = 25°C
5.68 mW/°C
TA = 70°C
POWER RATING POWER RATING
454 mW 369 mW
TA = 85°C
TA = 125°C
POWER RATING
142 mW
PACKAGE
D
Recommended Operating Conditions
MIN
MAX
18
UNIT
V
VDD
Input voltage
VOUT
Output voltage range
Average output current
Reference output current
Operating junction temperature
18
V
(1)
IOUT
200
–20
150
mA
mA
°C
(1)
IOUT(ref
)
(1)
TJ
–55
(1) It is not recommended that the device operate under conditions beyond those specified in this table for extended periods of time.
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BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
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SGLS352A–DECEMBER 2006–REVISED JANUARY 2007
Electrical Characteristics
VDD = 15 V(1), RT = 10 kΩ, CT = 3.3 nF, CVDD = 0.1 µF and no load on the outputs, TA = TJ = –55°C to 125°C for the
UCC28C4x
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
Reference
Output voltage, initial accuracy
Line regulation
TA = 25°C , IOUT = 1 mA
4.9
5
0.2
3
5.1
20
25
V
VDD = 12 V to 18 V
mV
mV
Load regulation
1 mA to 20 mA
(2)
Temperature stability
Total output variation
Output noise voltage
Long term stability
Output short circuit
0.2
0.4 mV/°C
(2)
4.82
–30
5.18
V
10 Hz to 10 kHz, TA = 25°C(2)
1000 hours, TA = 125°C(2)
50
5
µV
mV
mA
25
–45
–55
Oscillator
TA = 25°C(3)
TA = Full Range(3)
50.5
50.5
53
55
57
1
kHz
KHz
%
Initial accuracy
Voltage stability
Temperature stability
Amplitude
VDD = 12 V to 18 V
0.2
1
(2)
TMIN to TMAX
2.5
%
RT/CT pin peak to peak
TA = 25°C, RT/CT = 2 V(4)
RT/CT = 2 V(4)
1.9
8.4
8.4
V
7.7
7.2
9
mA
mA
Discharge current
9.5
Error Amplifier
Feedback input voltage, initial accuracy
VCOMP = 2.5 V, TA = 25°C
2.475 2.500 2.525
V
V
Feedback input voltage, total variation
Input bias current
VCOMP = 2.5 V
2.45
2.50
–0.1
90
2.55
–2
µA
dB
MHz
dB
mA
mA
V
AVOL
Open-loop voltage gain
Unity gain bandwidth
VOUT = 2 V to 4 V
65
1
See Note 2
1.5
PSRR
Power-supply rejection ratio
Output sink current
VDD = 12 V to 18 V
60
2
VFB = 2.7 V, VCOMP = 1.1 V
VFB = 2.3 V, VCOMP = 5 V
VFB = 2.3 V, RLOAD = 15 k to GND
VFB = 2.7 V, RLOAD = 15 k to VREF
14
–1
Output source current
–0.5
5
VOH
VOL
High-level output voltage
Low-level output voltage
6.8
0.1
1.1
V
Current Sense
(5)(6)
TA = 25°C
2.85
2.825
0.9
3
3.15
3.15
1.1
V/V
V/V
V
Gain
(5)(6)
TA = Full Range
Maximum input signal
VFB < 2.4 V
VDD = 12 V to 18 V(2)(5)
1
70
PSRR
Power-supply rejection ratio
Input bias current
dB
µA
ns
V
–0.1
35
–2
70
CS to output delay
COMP to CS offset
VCS = 0 V
1.15
Output
VOUT low (RDS(on) pull-down)
VOUT high (RDS(on) pull-up)
ISINK = 200 mA
5.5
10
15
25
Ω
Ω
ISOURCE = 200 mA
(1) Adjust VDD above the start threshold before setting at 15 V.
(2) Specified by design. Not production tested.
(3) Output frequencies of the UCC28C41, UCC28C44, and UCC28C45 are one-half the oscillator frequency.
(4) Oscillator discharge current is measured with RT = 10 kΩ to VREF
.
(5) Parameter measured at trip point of latch with VFB = 0 V.
DV
COM
ACS +
, 0 V v V
v 900 mV
CS
DV
CS
(6) Gain is defined as
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BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
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SGLS352A–DECEMBER 2006–REVISED JANUARY 2007
Electrical Characteristics (continued)
VDD = 15 V, RT = 10 kΩ, CT = 3.3 nF, CVDD = 0.1 µF and no load on the outputs, TA = TJ = –55°C to 125°C for the UCC28C4x
PARAMETER
Rise tIme
TEST CONDITIONS
TA = 25°C, CLOAD = 1 nF
MIN
TYP
25
MAX UNIT
50
40
ns
ns
Fall time
TA = 25°C, CLOAD = 1 nF
20
Undervoltage Lockout (UVLO)
UCC28C42-EP, UCC28C44-EP
UCC28C43-EP, UCC28C45-EP
UCC28C40-EP, UCC28C41-EP
UCC28C42-EP, UCC28C44-EP
UCC28C43-EP, UCC28C45-EP
UCC28C40-EP, UCC28C41-EP
13.5
7.8
6.5
8
14.5
8.4
7
15.5
9
Start threshold
V
V
7.5
10
9
Minimum operating voltage
7
7.6
6.6
8.2
7.1
6.1
PWM
UCC28C42-EP, UCC28C43-EP,
UCC28C40-EP, UCC28C44-EP,
UCC28C45-EP, UCC28C41-EP
94
47
96
48
Maximum duty cycle
%
Minimum duty cycle
Current Supply
0%
ISTART-UP Start-up current
VDD = UVLO start threshold (–0.5 V)
VFB = VCS = 0 V
50
100
3
µA
IDD
Operating supply current
2.3
mA
PDIP (P) or SOIC (D) PACKAGE
(TOP VIEW)
COMP
FB
VREF
VDD
OUT
GND
1
2
3
4
8
7
6
5
CS
RT/CT
Pin Assignments
COMP: This pin provides the output of the error amplifier for compensation. In addition, the COMP pin is
frequently used as a control port by utilizing a secondary-side error amplifier to send an error signal across the
secondary-primary isolation boundary through an opto-isolator.
CS: The current-sense pin is the noninverting input to the PWM comparator. This is compared to a signal
proportional to the error amplifier output voltage. A voltage ramp can be applied to this pin to run the device with
a voltage mode control configuration.
FB: This pin is the inverting input to the error amplifier. The noninverting input to the error amplifier is internally
trimmed to 2.5 V ± 1%.
GND: Ground return pin for the output driver stage and the logic-level controller section.
OUT: The output of the on-chip drive stage. OUT is intended to directly drive a MOSFET. The OUT pin in the
UCC28C40, UCC28C42, and UCC28C43 is the same frequency as the oscillator, and can operate near 100%
duty cycle. In the UCC28C41, UCC28C44, and the UCC28C45, the frequency of OUT is one-half that of the
oscillator due to an internal T flipflop. This limits the maximum duty cycle to <50%.
RT/CT: Timing resistor and timing capacitor. The timing capacitor should be connected to the device ground
using minimal trace length.
VDD: Power supply pin for the device. This pin should be bypassed with a 0.1-µF capacitor with minimal trace
lengths. Additional capacitance may be needed to provide hold up power to the device during startup.
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BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
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SGLS352A–DECEMBER 2006–REVISED JANUARY 2007
VREF: 5-V reference. For stability, the reference should be bypassed with a 0.1-µF capacitor to ground using
the minimal trace length possible.
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BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
www.ti.com
SGLS352A–DECEMBER 2006–REVISED JANUARY 2007
APPLICATION INFORMATION
This device is a pin-for-pin replacement of the bipolar UC2842 family of controllers—the industry standard PWM
controller for single-ended converters. Familiarity with this controller family is assumed.
The UCC28C4x series is an enhanced replacement with pin-to-pin compatibility to the bipolar UC284x and
UC284xA families. The new series offers improved performance when compared to older bipolar devices and
other competitive BiCMOS devices with similar functionality. Note that these improvements discussed below
generally consist of tighter specification limits that are a subset of the older product ratings, maintaining drop-in
capability. In new designs these improvements can be utilized to reduce the component count or enhance circuit
performance when compared to the previously available devices.
Advantages
This device increases the total circuit efficiency whether operating off-line or in dc input circuits. In off-line
applications the low start-up current of this device reduces steady state power dissipation in the startup resistor,
and the low operating current maximizes efficiency while running. The low running current also provides an
efficiency boost in battery-operated supplies.
Low-Voltage Operation
Two members of the UCC28C4x family are intended for applications that require a lower start-up voltage than
the original family members. The UCC28C40 and UCC28C41 have a turn-on voltage of 7 V typical and exhibit
hysteresis of 0.4 V for a turn-off voltage of 6.6 V. This reduced start-up voltage enables use in systems with
lower voltages, such as 12-V battery systems that are nearly discharged.
High-Speed Operation
The BiCMOS design allows operation at high frequencies that were not feasible in the predecessor bipolar
devices. First, the output stage has been redesigned to drive the external power switch in approximately
one-half the time of the earlier devices. Second, the internal oscillator is more robust, with less variation as
frequency increases. In addition, the current sense to output delay has been reduced by a factor of three, to 45
ns typical. These features combine to provide a device capable of reliable high-frequency operation.
The UCC28C4x family oscillator is true to the curves of the original bipolar devices at lower frequencies, yet
extends the frequency programmability range to at least 1 MHz. This allows the device to offer pin-to-pin
capability where required, yet capable of extending the operational range to the higher frequencies typical of
latest applications. When the original UC2842 was released in 1984, most switching supplies operated between
20 kHz and 100 kHz. Today, the UCC28C4x can be used in designs cover a span roughly ten times higher than
those numbers.
Start/Run Current Improvements
The start-up current is only 60 µA typical, a significant reduction from the bipolar device's ratings of 300 µA
(UC284xA). For operation over the temperature range of –55°C to 125°C, the UCC28C4x devices offer a
maximum startup current of 100 µA, an improvement over competitive BiCMOS devices. This allows the
power-supply designer to further optimize the selection of the start-up resistor value to provide a more efficient
design. In applications where low component cost overrides maximum efficiency the low run current of 2.3 mA
typical may allow the control device to run directly through the single resistor to (+) rail, rather than needing a
bootstrap winding on the power transformer, along with a rectifier. The start/run resistor for this case must also
pass enough current to allow driving the primary switching MOSFET, which may be a few milliamps in small
devices.
±1% Initial Reference Voltage
The BiCMOS internal reference of 2.5 V has an enhanced design and utilizes production trim to allow initial
accuracy of ±1% at room temperature and ±2% over the full temperature range. This can be used to eliminate
an external reference in applications that do not require the extreme accuracy afforded by the additional device.
This is very useful for nonisolated dc-to-dc applications where the control device is referenced to the same
common as the output. It is also applicable in offline designs that regulate on the primary side of the isolation
boundary by looking at a primary bias winding, or perhaps from a winding on the output inductor of a
buck-derived circuit.
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BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
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SGLS352A–DECEMBER 2006–REVISED JANUARY 2007
APPLICATION INFORMATION (continued)
Reduced Discharge Current Variation
The original UC2842 oscillator did not have trimmed discharged current, and the parameter was not specified on
the data sheet. Since many customers attempted to use the discharge current to set a crude dead-time limit, the
UC2842A family was released with a trimmed discharge current specified at 25°C. The UCC28C4x series now
offers even tighter control of this parameter, with approximately ±3% accuracy at 25°C, and less than 10%
variation over temperature using the UCC28C4x devices. This level of accuracy can enable a meaningful limit to
be programmed, a feature not currently seen in competitive BiCMOS devices. The improved oscillator and
reference also contribute to decreased variation in the peak-to-peak variation in the oscillator waveform, which is
often used as the basis for slope compensation for the complete power system.
Soft-Start
Figure 1 provides a typical soft-start circuit for use with the UCC28C42. The values of R and C should be
selected to bring the COMP pin up at a controlled rate, limiting the peak current supplied by the power stage.
After the soft-start interval is complete, the capacitor continues to charge to VREF, effectively removing the PNP
transistor from circuit considerations.
The optional diode in parallel with the resistor forces a soft-start each time the PWM goes through UVLO and
the reference (VREF) goes low. Without the diode, the capacitor otherwise remains charged during a brief loss of
supply or brownout, and no soft-start is enabled upon reapplication of VIN.
8
1
V
REF
UCC28C42
COMP
GND
5
UDG-01072
Figure 1.
Oscillator Synchronization
The UCC28C4x oscillator has the same synchronization characteristics as the original bipolar devices. Thus, the
information in the application report U-100A, UC2842/3/4/5 Provides Low-Cost Current-Mode Control (SLUA143)
still applies. The application report describes how a small resistor from the timing capacitor to ground can offer
an insertion point for synchronization to an external clock (see Figure 2 and Figure 3). Figure 2 shows how the
UCC28C42 can be synchronized to an external clock source. This allows precise control of frequency and dead
time with a digital pulse train.
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BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
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SGLS352A–DECEMBER 2006–REVISED JANUARY 2007
APPLICATION INFORMATION (continued)
8
4
V
REF
R
T
SYNCHRONIZATION
CIRCUIT INPUT
R / C
T
T
C
T
UCC28C42
PWM
24
UDG-01069
Figure 2. Oscillator Synchronization Circuit
UPPER THRESHOLD
LOWER THRESHOLD
CLOCK
INPUT
LOW
HIGH
OFF .
LOW
ON .
PWM
OUT
ON .
OUTPUT A
VCT (ANALOG)
UPPER THRESHOLD
VCT
LOWER THRESHOLD
VSYNC (DIGITAL)
COMBINED
UDG−01070
Figure 3. Synchronization to an External Clock
Precautions
The absolute maximum supply voltage is 20 V, including any transients that may be present. If this voltage is
exceeded, device damage is likely. This is in contrast to the predecessor bipolar devices that could survive up to
30 V. Thus, the supply pin should be decoupled as close to the ground pin as possible. Also, since no clamp is
included in the device, the supply pin should be protected from external sources that could exceed the 20 V
level.
Careful layout of the printed board has always been a necessity for high-frequency power supplies. As the
device switching speeds and operating frequencies increase, the layout of the converter becomes increasingly
important.
This 8-pin device has only a single ground for the logic and power connections. This forces the gate drive
current pulses to flow through the same ground that the control circuit uses for reference. Thus, the interconnect
inductance should be minimized as much as possible. One implication is to place the device (gate driver)
circuitry close to the MOSFET it is driving. Note that this can conflict with the need for the error amplifier and the
feedback path to be away from the noise generating components.
Circuit Applications
Figure 4 shows a typical off-line application.
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BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
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SGLS352A–DECEMBER 2006–REVISED JANUARY 2007
APPLICATION INFORMATION (continued)
D50
F1
12 V
OUT
T1
R10
C52
C55
C3
D2
C12
AC INPUT
100 Vac - 240 Vac
EMI FILTER
+
R56
BR1
L50
R11
D51
REQUIRED
C1A
C18
5 V
R12
OUT
RT1
C53
C54
D6
R55
C5
SEC
COMMON
R6
R50
UCC28C44
R16
C13
1
2
3
4
COMP REF
8
7
6
5
IC2
Q1
IC2
FB
CS
VCC
OUT
R53
C50
R52
C51
R50
RT/CT GND
K
IC3
A
R
R54
UDG-01071
Figure 4. Typical Off-Line Application
Figure 5 shows the forward converter with synchronous rectification. This application provides 48 V to 3.3 V at
10 A with over 85% efficiency, and uses the UCC28C42 as the secondary-side controller and UCC3961 as the
primary-side startup control device.
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BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
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APPLICATION INFORMATION (continued)
+
+
+
+
Figure 5. Forward Converter With Synchronous Rectification
Using the UCC28C42 as the Secondary-Side Controller
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BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
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APPLICATION INFORMATION (continued)
OSCILLATOR FREQUENCY
OSCILLATOR DISCHARGE CURRENT
vs
vs
TIMING RESISTANCE AND CAPACITANCE
TEMPERATURE
9.5
9.0
8.5
10 M
1 M
CT = 220 pF
CT = 470 pF
CT = 1 nF
100 k
10 k
1 k
8.0
7.5
7.0
CT = 4.7 nF
CT = 2.2 nF
1 k
10 k
100 k
−50
−25
0
25
50
75
100
125
T − Temperature − °C
J
R
T
− Timing Resistance − W
Figure 6.
Figure 7.
COMP to CS OFFSET VOLTAGE (with CS = 0)
ERROR AMPLIFIER
vs
FREQUENCY RESPONSE
TEMPERATURE
100
200
180
1.8
90
80
70
60
50
40
30
20
10
1.6
1.4
160
140
GAIN
1.2
1.0
120
100
80
0.8
0.6
60
40
PHASE
MARGIN
0.4
0.2
0.0
20
0
0
1
10
100
1 k 10 k 100 k 1 M 10 M
−50
−25
0
25
50
75
100
125
f − Frequency − Hz
T − Temperature − °C
J
Figure 8.
Figure 9.
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BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
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SGLS352A–DECEMBER 2006–REVISED JANUARY 2007
APPLICATION INFORMATION (continued)
REFERENCE VOLTAGE
ERROR AMPLIFIER REFERENCE VOLTAGE
vs
vs
TEMPERATURE
TEMPERATURE
2.55
2.54
5.05
5.04
5.03
5.02
5.01
2.53
2.52
2.51
2.50
2.49
5.00
4.99
4.98
4.97
4.96
2.48
2.47
2.46
2.45
4.95
−50
−25
0
25
50
75
100
125
−50
−25
0
25
50
75
100
125
T − Temperature − °C
J
T − Temperature − °C
J
Figure 10.
Figure 11.
REFERENCE SHORT-CIRCUIT CURRENT
ERROR AMPLIFIER INPUT BIAS CURRENT
vs
vs
TEMPERATURE
TEMPERATURE
200
−35
−37
−39
−41
150
100
50
0
−43
−45
−47
−49
−51
−53
−55
−50
−100
−150
−200
−50
−25
0
25
50
75
100
125
−50
−25
0
25
50
75
100
125
T − Temperature − °C
J
T − Temperature − °C
J
Figure 12.
Figure 13.
13
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BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
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SGLS352A–DECEMBER 2006–REVISED JANUARY 2007
APPLICATION INFORMATION (continued)
UNDERVOLTAGE LOCKOUT
UNDERVOLTAGE LOCKOUT
vs
TEMPERATURE (UCC28C44)
vs
TEMPERATURE (UCC28C45)
16
15
9.0
8.8
8.6
8.4
8.2
8.0
UVLO
ON
14
13
UVLO
ON
12
11
10
9
UVLO
OFF
7.8
7.6
7.4
7.2
7.0
8
UVLO
OFF
7
6
−50
−25
0
25
50
75
100
125
−50
−25
0
25
50
75
100
125
T − Temperature − °C
J
T − Temperature − °C
J
Figure 14.
Figure 15.
UNDERVOLTAGE LOCKOUT
vs
TEMPERATURE (UCC28C41)
SUPPLY CURRENT
vs
OSCILLATOR FREQUENCY
25
20
15
10
7.3
7.2
UVLO
ON
1-nF LOAD
7.1
7.0
6.9
6.8
6.7
NO LOAD
6.6
6.5
6.4
5
0
UVLO
OFF
0 k
200 k
400 k
600 k
800 k
1 M
6.3
f − Frequency − Hz
−50
−25
0
25
50
75
100
125
T − Temperature − °C
J
Figure 16.
Figure 17.
14
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BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
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SGLS352A–DECEMBER 2006–REVISED JANUARY 2007
APPLICATION INFORMATION (continued)
SUPPLY CURRENT
OUTPUT RISE TIME AND FALL TIME
vs
vs
TEMPERATURE
TEMPERATURE
40
35
3.0
2.9
10% to 90%
V
DD
= 12 V
tr
(1 nF)
2.8
2.7
30
25
20
2.6
2.5
2.4
tf
(1 nF)
NO LOAD
2.3
2.2
15
10
2.1
2.0
−50
−25
0
25
50
75
100
125
−50
−25
0
25
50
75
100
125
T − Temperature − °C
J
T − Temperature − °C
J
Figure 18.
Figure 19.
MAXIMUM DUTY CYCLE
vs
MAXIMUM DUTY CYCLE
vs
TEMPERATURE
OSCILLATOR FREQUENCY
100
98
96
94
92
90
100
UCC28C40
UCC28C42
UCC28C43
CT = 220 pF
90
80
70
60
CT = 1 nF
50
0
500
1000
1500
2000
2500
−50
−25
0
25
50
75
100
125
f − Frequency − kHz
T − Temperature − °C
J
Figure 20.
Figure 21.
15
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BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
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SGLS352A–DECEMBER 2006–REVISED JANUARY 2007
APPLICATION INFORMATION (continued)
MAXIMUM DUTY CYCLE
vs
CURRENT-SENSE THRESHOLD VOLTAGE
vs
TEMPERATURE
TEMPERATURE
1.10
1.05
1.00
0.95
0.90
50
49
48
47
46
45
UCC28C41
UCC28C44
UCC28C45
−50
−25
0
25
50
75
100
125
−50
−25
0
25
50
75
100
125
T − Temperature − °C
J
T − Temperature − °C
J
Figure 22.
Figure 23.
CS TO OUT DELAY TIME
vs
TEMPERATURE
70
65
60
55
50
45
40
35
30
−50
−25
0
25
50
75
100
125
T − Temperature − °C
J
Figure 24.
16
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PACKAGE OPTION ADDENDUM
www.ti.com
5-Feb-2007
PACKAGING INFORMATION
Orderable Device
UCC28C43MDREP
UCC28C45MDREP
V62/07615-01XE
V62/07615-02XE
Status (1)
ACTIVE
ACTIVE
ACTIVE
ACTIVE
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
SOIC
D
8
8
8
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
SOIC
SOIC
SOIC
D
D
D
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
no Sb/Br)
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
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