TL5001_15 [UTC]
PULSE-WIDTH-MODULATION CONTROL CIRCUIT;
| 型号： | TL5001_15 |
| 厂家： | 
Unisonic Technologies |
| 描述： | PULSE-WIDTH-MODULATION CONTROL CIRCUIT |
| 文件： | 总13页 (文件大小：255K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
TL5001
LINEAR INTEGRATED CIRCUIT
PULSE-WIDTH-MODULATION
CONTROL CIRCUITS
ꢀ
DESCRIPTION
The UTC TL5001 incorporates on a single monolithic chip all the
DIP-8
functions required for a pulse width modulation (PWM) control circuit.
Designed primarily for power-supply control, It contains an error
amplifier, a regulator, an oscillator, a PWM comparator with a
dead-time-control input, undervoltage lockout (UVLO), short-circuit
protection (SCP), and an open-collector output transistor.
The error-amplifier common-mode voltage ranges from 0V to 1.5V.
The noninverting input of the error amplifier is connected to a 1-V
reference. Dead-time control (DTC) can be set to provide 0% to
100% dead time by connecting an external resistor between DTC
and GND. The oscillator frequency is set by terminating RT with an
external resistor to GND. During low Vcc conditions, the UVLO
circuit turns the output off until Vcc recovers to its normal operating
range.
SOP-8
*Pb-free plating product number: TL5001L
ꢀ
FEATURES
*Complete PWM power control
*3.6-V to 40-V operation
*Internal under voltage-lockout circuit
*Internal short-circuit protection
*Oscillator frequency : 20kHz to 500kHz
*Variable dead timer provides control over total range
ꢀ ORDERING INFORMATION
Ordering Number
Package
Packing
Normal
Lead Free Plating
TL5001L-D08-T
TL5001L-S08-R
TL5001L-S08-T
TL5001-D08-T
TL5001-S08-R
TL5001-S08-T
DIP-8
SOP-8
SOP-8
Tube
Tape Reel
Tube
TL5001L-D08-R
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) R: Tape Reel, T: Tube
(2) D08: DIP-8, S08: SOP-8
(3) L: Lead Free Plating, Blank: Pb/Sn
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TL5001
LINEAR INTEGRATED CIRCUIT
ꢀ
PIN CONFIGURATION
VOUT
VCC
GND
RT
1
2
3
4
8
7
6
5
DTC
SCP
COMP
FB
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TL5001
LINEAR INTEGRATED CIRCUIT
ꢀ
ABSOLUTE MAXIMUM RATINGS OVER OPERATING FREE-AIR TEMPERATURE
RANGE (unless otherwise specified)*
PARAMETER
SYMBOL
VCC
RATINGS
UNIT
V
Supply Voltage (note 1)
Amplifier Input Voltage
Output Voltage
41
VI(FB)
20
V
VOUT
51
V
Output Current
IOUT
21
100
mA
mA
Output Peak Current
IO(PEAK)
Continuous Total Power Dissipation
Operating Ambient Temperature Range
Storage Temperature Range
See dissipation rating table
-20 ~ +85
TOPR
TSTG
°
°
C
C
-65 ~ +150
Note 1. All voltage values are with respect to the network ground terminal.
2. 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.
* 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.
ꢀ
DISSIPATION RATING TABLE
PACKAGE
TA≤25
POWER RATING
1000mW
°
C
DERATING FACTOR
ABOVE TA=25
TA=70
°
C
TA=70
°
C
TA=70°C
°C
POWER RATING POWER RATING POWER RATING
DIP-8
8.0mW/
5.8mW/
°
°
C
C
640mW
464mW
520mW
377mW
200mW
145mW
SOP-8
725mW
ꢀ
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
VCC
MIN
MAX
40
UNIT
Supply Voltage
3.6
0
V
V
Amplifier Input Voltage
Output Voltage
VI(FB)
VOUT
1.5
50
V
Output Current
IOUT
20
mA
μ
A
COMP Source Current
COMP dc Load Resistance
Oscillator Timing resistor
Oscillator Frequency
Operating Ambient Temperature Range
45
k
Ω
Ω
100
15
k
Rt
fosc
TA
250
500
85
20
kHz
-20
°C
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TL5001
LINEAR INTEGRATED CIRCUIT
ꢀ
ELECTRICAL CHARACTERISTICS OVER RECOMMENDED OPERATING FREE-AIR
TEMPERATURE RANGE (Vcc=6V, fosc=100kHz, all typical values at TA=25
°C, unless otherwise noted)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP MAX UNIT
Reference
Output Voltage
VOUT
COMP Connected to FB
Vcc=3.6V ~ 40V
0.95
1
2
1.05
12.5
10
V
Input Regulation
mV
TA= -20
°
C ~ 25
°
C
-10
-10
-1
2
Output Voltage Change with Temperature
mV/V
TA= 25
°
C ~ 85
°
C
10
Undervoltage Lockout
Upper
TA= 25
TA= 25
TA= 25
TA= 25
°
°
°
°
C
C
C
C
3
V
V
Threshold Voltage
VTHR
Lower
Reset
2.8
2.1
2.55
200
V
Hysteresis
100
mV
Short Circuit Protection
SCP Threshold voltage
SCP Voltage, Latched
TA= 25
°
C
0.95 1.00 1.05
V
No pullup
No pullup
140
185
60
230
120
-20
mV
mV
µA
V
SCP Voltage, UVLO Standby
Input Source Current
TA= 25
°
C
-10
-15
1.5
SCP Comparator 1 Threshold Voltage
Oscillator
Frequency
f
Rt=100k
Ω
100
15
kHz
kHz
kHz
kHz
kHz
kHz
V
Standard Deviation of Frequency
Frequency Change with Voltage
Vcc=3.6V ~ 40V
1
TA= -40
°
°
C ~ 25
°
°
C
C
-4
-4
-4
-0.4
-0.4
-0.2
1
4
4
4
Frequency Change with Temperature
TA= -20
C ~ 25
TA= 25°C ~ 85°C
Voltage at RT
VRT
Dead-time Control
0.9*IRT
1.1*IRT
Output (source) Current
Input Threshold Voltage
IO(SOURCE) V(DT)=1.5V
µA
V
(NOTE)
(NOTE)
Duty cycle=0%
0.5
0.7
1.3
VI(THR)
Duty cycle=100%
1.5
1.5
Error Amplifier
Input Voltage
VIN
Vcc=3.6V ~ 40V
0
V
nA
V
Input Bias Current
II(BIAS)
-160 -500
2.3
Positive
Output Voltage Swing
Negative
1.5
VO(SW)
GV
0.3
80
0.4
V
Open-Loop Voltage Amplification
Unity-Gain Bandwidth
Output (sink) Current
Output (source) Current
Output
dB
MHz
µA
µA
1.5
600
-70
IO(SINK)
VI(FB)=1.2V, COMP=1V
100
-45
IO(SOURCE) VI(FB)=0.8V, COMP=1V
Output Saturation Voltage
VO(SAT)
IOFF
IOUT=10mA
VOUT=50V,Vcc=0
VOUT=50V
1.5
40
2
V
10
10
Off-State Current
µA
mA
Short-Circuit Output Current
Total Device
IO(SC)
VOUT=6V
Standby Supply Current (Off state)
Average Supply Current
ISTN-BY
1
1.5
2.1
mA
mA
Rt=100k
Ω
1.4
Note: Output source current at RT
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TL5001
LINEAR INTEGRATED CIRCUIT
ꢀ
SCHEMATIC FOR TYPICAL APPLICATION
VIN
+
TSP1101
VOUT
+
2
VCC
5
1
3
SCP
VOUT
COMP
UTC
TL5001
6
7
DTC
RT
4
FB
GND
8
ꢀ
FUNCTIONAL BLOCK DIAGRAM
RT
7
DTC
6
OUT
1
VCC
2
UVLO
IDT
1V
2.5V
1V
Reference
Voltage
1.5V
Error
Amplifier
PWM/DTC
Comparator
scp
Comparator 1
OSC
+
-
4
3
FB
COMP
5
SCP
scp
Comparator 2
8
GND
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TL5001
LINEAR INTEGRATED CIRCUIT
ꢀ
DETAILED DESCRIPTION
VOLTAGE REFERENCE
A 2.5-V regulator operating from Vcc is used to power the internal circuitry of the TL5001 and as a reference for
the error amplifier and SCP circuit. A resistive divider provides a 1-V reference for the error amplifier non-inverting
input which typically is within 2% of nominal over the operating temperature range.
ERROR AMPLIFIER
The error amplifier compares a sample of the dc-to-dc converter output voltage to the 1-V reference and generates
an error signal for the PWM comparator. The dc-to-dc converter output voltage is set by selecting the error –amplifier
gain (see Figure 1), using the following expression.
VOUT=(1+R1/R2) (1V)
Compensation
3 COMP
4 FB
Network
R1
V
I(FB)
-
R2
To PWM
+
Comparator
GND
8
VREF=1V
Figure 1.Error-Amplifier Gain Setting
The error-amplifier output is brought out as COMP for use in compensating the dc-to-dc converter control loop for
stability. Because the amplifier can only source 45µA, the total dc load resistance should be 100kΩ or more.
OSCILLATOR/PWM
The oscillator frequency (fosc) can be set between 20kHz and 500kHz by connecting a resistor between RT and
GND .Acceptable resistor values range from 15 kΩ to 250 kΩ. The oscillator frequency can be determined by using
the graph shown in Figure 5.
The oscillator output is a triangular wave with a minimum value of approximately 0.7V and a maximum value of
approximately 1.3V. The PWM comparator compares the error-amplifier output voltage and the DTC input voltage to
the triangular wave and turns the output transistor off whenever the triangular wave is greater than the lesser of the
two inputs.
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TL5001
LINEAR INTEGRATED CIRCUIT
ꢀ
DETAILED DESCRIPTION(Cont.)
DEAD TIME CONTORL (DTC)
DTC provides a means of limiting the output-switch duty cycle to a value less than 100%, which is critical for boost
and flyback converters. A current source generates a reference current (IDT) at DTC that is nominally equal to the
current at the oscillator timing terminal, RT. Connecting a resistor between DTC and GND generates a dead-time
reference voltage (VDT), which the PWM/DTC comparator compares to the oscillator triangle wave as described in
the previous section. Nominally, the maximum duty cycle is 0% when VDT is 0.7V or less and 100% when VDT is
1.3V or greater. Because the triangle wave amplitude is a function of frequency and the source impedance of RT is
relatively high(1250Ω),choosing RDT for a specific maximum duty cycle, D, is accomplished using the following
equation and the voltage limits for the frequency in question as found in Figure 11(Voscmax and Voscmin are the
maximum and minimum oscillator levels):
RDT=(Rt +1250)[D(Vosc max-Vosc min)+Vosc min]
Where
RDT and Rt are in ohms, D in decimal
Soft start can be implemented by paralleling the DTC resistor with a capacitor (CDT) as shown in Figure 2. During
soft start, the voltage at DTC is derived by the following equation:
V
DT≈IDTRDT(1-e(-t/RDTCDT)
)
DTC
6
UTC
TL5001
R
DT
C
DT
Figure 2. Soft- Start Circuit
If the dc-to-dc converter must be in regulation within a specified period of time, the time constant, RDTCDT,
should be t0/3 to t0/5.The UTC TL5001 remains off unit VDT≈0.7V, the minimum ramp value. CDT is discharged
every time UVLO or SCP becomes active.
UNDERVOLTAGE-LOCKOUT (UVLO) PROTECTION
The undervoltage-lockout circuit turns the output transistor off and resets the SCP latch whenever the supply
voltage drops too low (approximately 3V at 25
℃) for proper operation. A hysteresis voltage of 200mV eliminates
false triggering on noise and chattering.
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TL5001
LINEAR INTEGRATED CIRCUIT
ꢀ
DETAILED DESCRIPTION(Cont.)
SHORT-CIRCUIT PROTECTION (SCP)
The UTC TL5001 includes short-circuit protection (see Figure 3), which turns the power switch off to prevent
damage when the converter output is shorted. When activated, The SCP prevents the switch from being turned on
until the internal latching circuit is reset. The circuit is reset by reducing the input voltage until UVLO becomes active
or until the SCP terminal is pulled to ground externally.
When a short circuit occurs, the error-amplifier output at COMP rises to increase the power-switch duty cycle in an
attempt to maintain the output voltage. SCP comparator 1 starts an RC timing circuit when COMP exceeds 1.5V.If
the short is removed and the error-amplifier output drops below 1.5V before time out, normal converter operation
continues. If the fault is still present at the end of the time-out period, the time sets the latching circuit and turns off
the UTC TL5001 output transistor.
2.5V
RSCP
185kO
12kO
scp
Comparator 2
CSCP
SCP
To Output
Drive Logic
5
From Error
Amp
Q1
scp
Comparator 1
VREF=1V
1.5V
Q2
Figure 3.SCP Circuit
The timer operates by charging an external capacitor (Cscp),connected between the SCP terminal and ground,
towards 2.5V through a 185k resistor (Rscp).The circuit begins charging from an initial voltage of approximately
Ω
185mV and times out when capacitor voltage reaches 1V.The output of SCP comparator 2 then goes high, turns on
Q2,and latches the timer circuit. The expression for setting the SCP time period is derived from the following
equation:
-t/
τ
Vscp =(2.5-0.185)(1-e )+0.185
Where
ι=RscpCscp
The end of the time-out period, tscp, occurs when Vscp=1V. Solving for Cscp yields:
Cscp=12.46*tscp
Where
t is in seconds, C in µF
tscp must be much longer (generally 10 to 15 times) than the converter start-up period or the converter will not
start.
OUTPUT TRANSISTOR
The output of the UTC TL5001 is an open-collector transistor with a maximum collector current rating of 21mA and
a voltage rating of 51V.The output is turned on under the following conditions: the oscillator triangle wave is lower
than both the DTC voltage and the error-amplifier output voltage, the UVLO circuit is inactive, and the short-circuit
protection circuit is inactive.
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TL5001
LINEAR INTEGRATED CIRCUIT
ꢀ
PARAMETER MEASUREMENT INFORMATION
COMP
2.3V
1.5V
DTC
OSC
PWM/DTC
Comparator
OUT
scp
Comparator 1
1V
scp
SCP Timing Period
0V
scp
Comparator2
3V
VCC
NOTE A:The waveforms show timing characteristics for an intermittent short circuit and a longer short circuit that is sufficient to activate SCP.
Figure 4. PWM Timing Diagram
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TL5001
LINEAR INTEGRATED CIRCUIT
ꢀ
APPLICATION INFORMATION
VIN
5V
C1
100μF
10V
R1
470Ω
+
Q1
TPS1101
GND
L1
20μH
3.3V
GND
C3
0.1μF
CR1
MBRS140T3
+
C2
100μF
2
C4
1μF
+
VCC
10V
5
1
SCP
VOUT
C4
0.1μF
3
COMP
R7
2.0kΩ
R5
7.50kΩ
1%
UTC
TL5001
DTC
C6
0.012μF
R2
56kΩ
6
7
C7
0.0047μF
R4
5.1kΩ
R3
43kΩ
4
FB
RT
R6
3.24kΩ
1%
GND
8
Partial Bill of Materials:
Q1
L1
TPS1101
CTX20-1 or
Texas Instruments
Coiltronics
23 turns of #28 wire on
Micrometals No. T50-26B core
TPSD 107M010R0100
TPSD 107M010R0100
C1
C2
AVX
AVX
CR1 MBRS140T3
Motorola
NOTES: A. Frequency = 200KHz
B. Duty cycle = 90% max
C. Soft-start time constant (TC) = 5.6ms
D. SCP TC = 70msA
Figure 5. Step-Down Converter
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TL5001
LINEAR INTEGRATED CIRCUIT
ꢀ
TYPICAL CHARACTERISTICS
Oscillator Frequency
vs Timing Resistance
Oscillator Frequency
vs Ambient Temperature
1M
100
Vcc=6V
DT Resistance=Rt
=25°C
98
96
94
TA
100k
10k
92
Vcc=6V
DT Resistance=100kΩ
Rt=100kΩ
90
88
1M
10k
100k
-50 -25
0
25
50
75 100
Ambient Temperature, TA(°C)
Timing Resistance, Rt (Ω)
Reference Output Voltage
vs Power -Supply Voltage
Reference Output Voltage Fluctuation
vs Ambient Temperature
0.6
0.4
0.2
0
2
1.8
1.6
Vcc=6V
FB and COMP
Connected Together
TA=25°C
FB and COMP
Connected Together
1.4
1.2
1
-0.2
0.8
-0.4
-0.6
-0.8
0.6
0.4
0.2
0
-50 -25
0
25
50
75 100
0
1
2
3
4
5
6
7
8 9 10
Ambient Temperature, TA (°C)
Power-Supply Voltage, Vcc (V)
Average Supply Current
vs Power -Supply Voltage
Average Supply Current
vs Ambient Temperature
1.3
2
Rt=100kΩ
=25°C
1.2
1.1
1
T
A
1.5
1
0.9
0.5
0
Vcc=6V
DT Resistance=100kΩ
Rt=100kΩ
0.8
0
-50 -25
0
25
50
75 100
(°C)
30
Power-Supply Voltage, Vcc (V)
0
10
20
40
Ambient Temperature, T
A
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TL5001
LINEAR INTEGRATED CIRCUIT
ꢀ
TYPICAL CHARACTERISTICS(Cont.)
PWM Triangle Wave Amplitude Voltage
vs Oscillator Frequency
Error Amplifier Output Voltage
vs Output(Sink)Current
3
1.8
1.5
1.2
Vcc=6V
TA=25°C
VI(FB)=1.2V
Vcc=6V
TA=25°C
2.5
2
Voscmax(100% duty cycle )
1.5
0.9
0.6
1
Vosc min(zero duty cycle )
0.3
0
0.5
0
1M
10k
100k
10M
0
0.2
0.4
0.6
Oscillator Frequency, fosc (Hz)
Output(Sink)Current, IoUT (mA)
Error Amplifier Output Voltage
vs Output(Source)Current
Error Amplifier Output Voltage
vs Ambient Temperature
3
2.46
2.5
2
2.45
2.44
2.43
1.5
1
2.42
Vcc=6V
TA=25°C
VI(FB)=0.8V
Vcc=6V
VI(FB)=0.8V
No Load
0.5
0
2.41
2.40
20
40
60
80 100
-50 -25
0
25
50
75 100
0
120
Output(Source)Current, IoUT(uA)
Ambient Temperature, TA(°C)
Error Amplifier Open-Loop Gain and Phase Shift
vs Frequency
Error Amplifier Output Voltage
vs Ambient Temperature
240
220
40
-180°
Vcc=6V
VI(FB)=1.2V
No Load
Vcc=6V
TA=25°C
30
-210°
-240°
200
180
160
20
10
0
Gv
-270°
-300°
-330°
-360°
Φ
140
120
-10
-20
-50 -25
0
25
50
75 100
1M
Frequency, f(Hz)
10k
100k
10M
Ambient Temperature, TA(°C)
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TL5001
LINEAR INTEGRATED CIRCUIT
ꢀ
TYPICAL CHARACTERISTICS(Cont.)
Scp-Time-Output Period
vs SCP Capacitance
Output Duty Cycle
vs DTC Voltage
12
120
Vcc=6V
=25℃
Rt =100Ω
T
A
10
8
100
80
6
60
4
40
Vcc=6V
TA=25℃
Rt =100Ω
DT Resistance =200kΩ
2
0
20
0
0
20
40
60
80
100 120
2
0
0.5
1
1.5
Cscp-scp Capacitance -nF
DTC Voltage -V
DTC Output Current
vs RT Output Current
Output Saturation Voltage
vs Output (Sink) Current
-60
2
T
A
=25℃
Vcc=6V
=25℃
DT Voltage =1.3V
-50
-40
-30
T
A
1.5
1
-20
0.5
0
-10
0
-10 -20
-30
-40 -50
-50 -25
0
25
50
75 100
0
-60
RT Output Current, IoUT (µA)
Output(Sink)Current, Io(SINK) (mA)
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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