TL5002 [TI]
PULSE-WIDTH-MODULATION CONTROL CIRCUIT; 脉宽调制控制电路
| 型号： | TL5002 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | PULSE-WIDTH-MODULATION CONTROL CIRCUIT |
| 文件： | 总14页 (文件大小：227K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TL5002
PULSE-WIDTH-MODULATION CONTROL CIRCUIT
SLVS304A – SEPTEMBER 2000 – REVISED AUGUST 2002
D PACKAGE
(TOP VIEW)
D
D
D
D
D
Complete PWM Power Control
3.6-V to 40-V Operation
Internal Undervoltage-Lockout Circuit
Oscillator Frequency . . . 20 kHz to 500 kHz
OUT
GND
RT
1
2
3
4
8
7
6
5
V
CC
COMP
INV
DTC
NI
Variable Dead Time Provides Control Over
Total Range
D
D
Ideal Controller for DDR Memory
Application
Uncommitted Error Amplifier Inputs
description
The TL5002 incorporates on a single monolithic chip all the functions required for a pulse-width-modulation
(PWM) control circuit. Designed primarily for power-supply control, the TL5002 contains an error amplifier, a
regulator, an oscillator, a PWM comparator with a dead-time-control input, undervoltage lockout (UVLO), and
an open-collector output transistor.
The error-amplifier input common-mode voltage ranges from 0.9 V to 1.5 V. 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 V conditions, the UVLO circuit
CC
turns the output off until V
recovers to its normal operating range.
CC
The TL5002 is characterized for operation from –40°C to 85°C.
AVAILABLE OPTIONS
SMALL OUTLINE
T
A
(D)
–20°C to 85°C
–40°C to 85°C
TL5002CD
TL5002ID
The D package is available taped and reeled. Add the suffix R
to the device type (e.g., TL5002CDR).
functional block diagram
V
DTC
6
RT
7
CC
2
OUT
1
UVLO
I
DT
2.5 V
Reference
Voltage
Error
Amplifier
5
+
PWM/DTC
Comparator
NI
OSC
4
–
INV
3
COMP
8
GND
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.
Copyright 2002, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL5002
PULSE-WIDTH-MODULATION CONTROL CIRCUIT
SLVS304A – SEPTEMBER 2000 – REVISED AUGUST 2002
detailed description
voltage reference
A 2.5-V regulator operating from V
is used to power the internal circuitry of the TL5002.
CC
error amplifier
The error amplifier compares a sample of the dc-to-dc converter output voltage to an external reference voltage
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:
V
= (1 + R1/R2) (1 V)
O
TL5002
3
COMP
Compensation
Network
R1
4
5
INV
NI
V
I(FB)
–
To PWM
Comparator
R2
V
ref
+
8
GND
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 45 µA, the total dc load resistance should be 100 kΩ or more.
oscillator/PWM
The oscillator frequency (f ) can be set between 20 kHz and 500 kHz by connecting a resistor between RT
osc
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 0.7 V and a maximum value
of approximately 1.3 V. 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.
dead-time control (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 (I ) at DTC that is nominally
DT
equaltothecurrentattheoscillatortimingterminal, RT. ConnectingaresistorbetweenDTCandGNDgenerates
a dead-time reference voltage (V ), which the PWM/DTC comparator compares to the oscillator triangle wave
DT
as described in the previous section. Nominally, the maximum duty cycle is 0% when V is 0.7 V or less and
DT
100% when V is 1.3 V or greater. Because the triangle wave amplitude is a function of frequency and the
DT
source impedance of RT is relatively high (1250 Ω), choosing R
for a specific maximum duty cycle, D, is
DT
accomplished using the following equation and the voltage limits for the frequency in question as found in
Figure 11 (V max and V min are the maximum and minimum oscillator levels):
osc
osc
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL5002
PULSE-WIDTH-MODULATION CONTROL CIRCUIT
SLVS304A – SEPTEMBER 2000 – REVISED AUGUST 2002
dead-time control (DTC) (continued)
ƪ ǒ
D V
Ǔ
minƫ
osc
+ ǒRt ) 1250
Ǔ
R
max – V
osc
min ) V
osc
DT
Where
R
and R are in ohms, D in decimal
t
DT
SoftstartcanbeimplementedbyparallelingtheDTCresistorwithacapacitor(C )asshowninFigure2. During
DT
soft start, the voltage at DTC is derived by the following equation:
ǒ–tńRDT DTǓ
C
–e
1
V
[ I
R
ǒ Ǔ
DT
DT DT
6
DTC
TL5002
C
R
DT
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, R
C
,
DT DT
should be t /3 to t /5. The TL5002 remains off until V ≈ 0.7 V, the minimum ramp value. C is discharged
0
0
DT
DT
every time UVLO becomes active.
undervoltage-lockout (UVLO) protection
The undervoltage-lockout circuit turns the output transistor off whenever the supply voltage drops too low
(approximately 3 V at 25°C) for proper operation. A hysteresis voltage of 200 mV eliminates false triggering on
noise and chattering.
output transistor
The output of the TL5002 is an open-collector transistor with a maximum collector current rating of 21 mA and
a voltage rating of 51 V. 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, and the UVLO circuit is inactive.
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL5002
PULSE-WIDTH-MODULATION CONTROL CIRCUIT
SLVS304A – SEPTEMBER 2000 – REVISED AUGUST 2002
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
Amplifier input voltage, V
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 V
CC
V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 V
I(INV), I(NI)
Output voltage, V , OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 V
O
Output current, I , OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 mA
O
Output peak current, I
, OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mA
O(peak)
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating ambient temperature range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to 85°C
A
Storage temperature range, T
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
stg
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
†
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.
NOTE 1: All voltage values are with respect to network ground terminal.
DISSIPATION RATING TABLE
DERATING FACTOR = 70°C
T
≤ 25°C
T
A
T
A
= 85°C
T = 125°C
A
A
PACKAGE
POWER RATING
ABOVE T = 25°C
POWER RATING POWER RATING POWER RATING
A
D
725 mW
5.8 mW/°C
464 mW
377 mW
145 mW
recommended operating conditions
MIN
3.6
MAX
UNIT
V
Supply voltage, V
CC
40
1.5
50
20
45
Amplifier input voltage, V
V
0.9
V
I(INV), I(NI)
Output voltage, V , OUT
V
O
Output current, I , OUT
O
mA
µA
kΩ
kΩ
kHz
°C
COMP source current
COMP dc load resistance
Oscillator timing resistor, R
100
15
250
500
85
t
Oscillator frequency, f
osc
20
Operating ambient temperature, T
–40
A
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL5002
PULSE-WIDTH-MODULATION CONTROL CIRCUIT
SLVS304A – SEPTEMBER 2000 – REVISED AUGUST 2002
electrical characteristics over recommended operating free-air temperature range, V
osc
= 6 V,
CC
f
= 100 kHz (unless otherwise noted)
undervoltage lockout
TL5002C
PARAMETER
TEST CONDITIONS
UNIT
†
MIN TYP
MAX
Upper threshold voltage
Lower threshold voltage
Hysteresis
T
= 25°C
= 25°C
= 25°C
3
V
V
A
T
A
2.8
T
A
100
200
mV
†
All typical values are at T = 25°C.
A
oscillator
TL5002C
PARAMETER
TEST CONDITIONS
R = 100 kΩ
UNIT
†
MIN TYP
MAX
Frequency
100
15
kHz
kHz
kHz
kHz
kHz
kHz
V
t
Standard deviation of frequency
Frequency change with voltage
V
CC
= 3.6 V to 40 V
1
T
= –40°C to 25°C
= –20°C to 25°C
= 25°C to 85°C
–4
–4
–4
–0.4
–0.4
–0.2
1
4
4
4
A
T
A
Frequency change with temperature
Voltage at RT
T
A
†
All typical values are at T = 25°C.
A
dead-time control
TL5002C
PARAMETER
TEST CONDITIONS
= 1.5 V
UNIT
µA
†
TYP
MIN
MAX
‡
Output (source) current
Input threshold voltage
TL5002
V
0.9 × I
1.2 × I
RT
(DT)
RT
0.5
Duty cycle = 0%
0.7
1.3
V
Duty cycle = 100%
1.5
†
‡
All typical values are at T = 25°C.
Output source current at RT
A
error amplifier
TL5002C
PARAMETER
TEST CONDITIONS
UNIT
†
MIN TYP
MAX
Input voltage
V
= 3.6 V to 40 V
0.3
1.5
V
nA
V
CC
Input bias current
–160 –500
Positive
1.5
2.3
Output voltage swing
Negative
0.3
80
0.4
V
Open-loop voltage amplification
Unity-gain bandwidth
dB
MHz
µA
µA
1.5
600
–70
Output (sink) current
V
V
= 1.2 V, COMP = 1 V
= 0.8 V, COMP = 1 V
100
I(INV)
Output (source) current
–45
I(INV)
†
All typical values are at T = 25°C.
A
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL5002
PULSE-WIDTH-MODULATION CONTROL CIRCUIT
SLVS304A – SEPTEMBER 2000 – REVISED AUGUST 2002
electrical characteristics over recommended operating free-air temperature range, V
osc
= 6 V,
CC
f
= 100 kHz (unless otherwise noted) (continued)
output
TL5002C
PARAMETER
TEST CONDITIONS
= 10 mA
UNIT
†
MIN TYP
MAX
Output saturation voltage
I
O
1.5
2
V
V
V
V
= 50 V,
V
CC
= 0
10
10
O
Off-state current
µA
= 50 V
= 6 V
O
O
Short-circuit output current
40
mA
†
All typical values are at T = 25°C.
A
total device
TL5002C
PARAMETER
TEST CONDITIONS
UNIT
†
MIN TYP
MAX
1.5
Standby supply current
Average supply current
Off state
1
mA
mA
R = 100 kΩ
1.4
2.1
t
†
All typical values are at T = 25°C.
A
PARAMETER MEASUREMENT INFORMATION
COMP
DTC
OSC
PWM/DTC
Comparator
OUT
3 V
V
CC
Figure 3. PWM Timing Diagram
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL5002
PULSE-WIDTH-MODULATION CONTROL CIRCUIT
SLVS304A – SEPTEMBER 2000 – REVISED AUGUST 2002
TYPICAL CHARACTERISTICS
OSCILLATION FREQUENCY
vs
OSCILLATOR FREQUENCY
vs
AMBIENT TEMPERATURE
TIMING RESISTANCE
100
98
96
94
92
90
88
1 M
V
= 6 V
V
= 6 V
CC
DT Resistance = R
CC
t
R = 100 kΩ
DT Resistance = 100 kΩ
t
T
A
= 25°C
100 k
10 k
10 k
100 k
1 M
– 50
– 25
0
25
50
75
100
R – Timing Resistance – Ω
t
T
A
– Ambient Temperature – °C
Figure 4
Figure 5
AVERAGE SUPPLY CURRENT
vs
POWER-SUPPLY VOLTAGE
AVERAGE SUPPLY CURRENT
vs
AMBIENT TEMPERATURE
2
1.5
1
1.3
1.2
1.1
1
R = 100 kΩ
t
V
= 6 V
CC
t
T
= 25 °C
A
R = 100 kΩ
DT Resistance = 100 kΩ
0.9
0.8
0
0.5
0
0
10
20
30
40
– 50
– 25
0
25
50
75
100
V
CC
– Power-Supply Voltage – V
T
A
– Ambient Temperature – °C
Figure 6
Figure 7
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL5002
PULSE-WIDTH-MODULATION CONTROL CIRCUIT
SLVS304A – SEPTEMBER 2000 – REVISED AUGUST 2002
TYPICAL CHARACTERISTICS
ERROR AMPLIFIER OUTPUT VOLTAGE
PWM TRIANGLE WAVE AMPLITUDE VOLTAGE
vs
vs
OUTPUT (SINK) CURRENT
OSCILLATOR FREQUENCY
3
2.5
2
1.8
1.5
1.2
V
V
V
= 6 V
= 1.2 V
CC
I(INV)
= 1 V
V
T
A
= 6 V
= 25 °C
CC
I(NI)
T
A = 25 °C
V max (100% duty cycle)
osc
1.5
1
0.9
0.6
V min (zero duty cycle)
osc
0.5
0
0.3
0
0
0.2
0.4
0.6
10 k
100 k
1 M
10 M
f
– Oscillator Frequency – Hz
I
O
– Output (Sink) Current – mA
osc
Figure 8
Figure 9
ERROR AMPLIFIER OUTPUT VOLTAGE
ERROR AMPLIFIER OUTPUT VOLTAGE
vs
vs
AMBIENT TEMPERATURE
OUTPUT (SOURCE) CURRENT
2.46
2.45
2.44
2.43
2.42
2.41
2.40
3
2.5
2
V
V
V
= 6 V
= 0.8 V
CC
I(INV)
= 1 V
I(NI)
No Load
1.5
1
V
= 6 V
= 0.8 V
CC
V
V
0.5
0
I(INV)
= 1 V
I(NI)
= 25 °C
T
A
– 50
– 25
0
25
50
75
100
0
20
40
60
80
100
120
T
A
– Ambient Temperature – °C
I
O
– Output (Source) Current – µA
Figure 10
Figure 11
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL5002
PULSE-WIDTH-MODULATION CONTROL CIRCUIT
SLVS304A – SEPTEMBER 2000 – REVISED AUGUST 2002
TYPICAL CHARACTERISTICS
OUTPUT DUTY CYCLE
vs
ERROR AMPLIFIER OUTPUT VOLTAGE
vs
DTC VOLTAGE
AMBIENT TEMPERATURE
120
100
80
60
40
20
0
240
V
= 6 V
V
V
V
= 6 V
= 1.2 V
CC
R = 100 kΩ
CC
I(INV)
= 1 V
t
T
A
= 25 °C
220
200
180
160
I(NI)
No Load
140
120
0
0.5
1
1.5
2
– 50
– 25
0
25
50
75
100
DTC Voltage – V
T
A
– Ambient Temperature – °C
Figure 12
Figure 13
ERROR AMPLIFIER CLOSED-LOOP GAIN AND
PHASE SHIFT
vs
FREQUENCY
40
30
20
–180°
–210°
V
T
A
= 6 V
CC
= 25 °C
–240°
–270°
–300°
–330°
–360°
A
V
10
0
φ
– 10
– 20
10 k
100 k
1 M
10 M
f – Frequency – Hz
Figure 14
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL5002
PULSE-WIDTH-MODULATION CONTROL CIRCUIT
SLVS304A – SEPTEMBER 2000 – REVISED AUGUST 2002
TYPICAL CHARACTERISTICS
OUTPUT SATURATION VOLTAGE
vs
DTC OUTPUT CURRENT
vs
RT OUTPUT CURRENT
OUTPUT (SINK) CURRENT
2
1.5
1
– 60
– 50
– 40
– 30
– 20
– 10
0
V
T
= 6 V
= 25 °C
DT Voltage = 1.3 V
= 25 °C
CC
A
T
A
0.5
0
0
– 10
– 20
– 30
– 40
– 50
– 60
0
5
10
15
20
I
O
– Output (Sink) Current – mA
I
O
– RT Output Current – µA
Figure 15
Figure 16
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL5002
PULSE-WIDTH-MODULATION CONTROL CIRCUIT
SLVS304A – SEPTEMBER 2000 – REVISED AUGUST 2002
APPLICATION INFORMATION
Figure 17. DDRI Application
11
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL5002
PULSE-WIDTH-MODULATION CONTROL CIRCUIT
SLVS304A – SEPTEMBER 2000 – REVISED AUGUST 2002
APPLICATION INFORMATION
PARTIAL BILL OF MATERIALS
PART NUMBER
QUANTITY
REF DES
DESCRIPTION
Capacitor, aluminum
Capacitor, ceramic
Capacitor, ceramic, jumper
Capacitor, aluminum
Capacitor, ceramic
Capacitor, ceramic
Capacitor, ceramic
Capacitor, ceramic
Capacitor, ceramic
Capacitor, ceramic
Diode, zener, 5.6 V
Terminal block, 2-pin
Header, 4-pin
MANUFACTURER
Nichicon
Taiyo Yuden
Murata
Panasonic
AVX
SIZE
0.327 x 0.327
1210
805
1
6
3
2
1
1
1
1
1
1
1
2
1
1
1
1
4
3
1
2
1
1
1
1
1
1
1
1
4
1
1
1
1
C1
C2 – C6, C13
C7, C8, C20
C9, C10
C14
UUD1C471MNR1GS
EMK325BJ106MN–B
GRM40X7R105K16PT
EEF–CD0D101R
7343
805
08055A102JAT2A
C15
GRM39X7R104K016D
Murata
NIP
603
C16
NMC0805X7R224K16TR
603
C17
VJ0603Y222KXANT
Murata
Kemet
Murata
On Semi
OST
603
C18
C0603C223J3RACTU
603
C19
GRM39X7R223K16
603
D1
1SMB5919BT3
SMB
J1, J2
J3
ED1609
PTC36SAAN
Sullins
Sullins
Coiltronics
Coiltronics
IR
JP1
PTC36SAAN
Header, 2-pin
L1
UP2B–1R0
Inductor, SMT
0.55 x 0.41
L2
UP4B–2R2
Inductor, SMT
Q1 – Q4
R1, R2, R4
R3
IRF7811
MOSFET, N–ch, 30 V
Resistor, chip, 4.7 Ω
Resistor, chip, 2.49 KΩ
Resistor, chip, 0 Ω
Resistor, chip, 20 KΩ
Resistor, chip, 162 KΩ
Resistor, chip, 1.74 KΩ
Resistor, chip, 7.32 KΩ
Open
SO8
603
Std
Std
Std
Std
603
R5, R6
R7
Std
Std
603
Std
Std
603
R8
Std
Std
603
R9
Std
Std
603
R10
Std
Std
603
R11
Std
Std
603
R12
Std
Resistor, chip, 15 KΩ
Resistor, chip, 10 Ω
Resistor, chip, 10 KΩ
Test point, red, 1 mm
Adaptor, 3.5 mm probe
Post, wirewrap
Std
603
R13
Std
Std
Std
603
R14
Std
603
TP1 – TP3, TP5
TP4
240-345
Farnell
Tektronix
Mill-Max
Texas Instruments
Texas Instruments
0.038
0.200
0.043
SO8
SO8
131-4244-00 or 131-5031-00
1045-3-17-15-30-14-02-0
TPS2837D
TP6
U1
IC, MOSFET driver
IC, low-cost PMW
U2
TL5002D
12
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL5002
PULSE-WIDTH-MODULATION CONTROL CIRCUIT
SLVS304A – SEPTEMBER 2000 – REVISED AUGUST 2002
MECHANICAL DATA
D (R-PDSO-G**)
PLASTIC SMALL-OUTLINE PACKAGE
14 PIN SHOWN
0.050 (1,27)
0.020 (0,51)
0.014 (0,35)
0.010 (0,25)
M
14
8
0.008 (0,20) NOM
0.244 (6,20)
0.228 (5,80)
0.157 (4,00)
0.150 (3,81)
Gage Plane
0.010 (0,25)
1
7
0°–ā8°
0.044 (1,12)
A
0.016 (0,40)
Seating Plane
0.004 (0,10)
0.010 (0,25)
0.004 (0,10)
0.069 (1,75) MAX
PINS **
8
14
16
DIM
0.197
(5,00)
0.344
(8,75)
0.394
(10,00)
A MAX
0.189
(4,80)
0.337
(8,55)
0.386
(9,80)
A MIN
4040047/D 10/96
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion, not to exceed 0.006 (0,15).
D. Falls within JEDEC MS-012
13
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