SE5561FE [NXP]
Switched-mode power supply control circuit; 开关电源的控制电路
| 型号： | SE5561FE |
| 厂家： | 
NXP |
| 描述： | Switched-mode power supply control circuit |
| 文件： | 总5页 (文件大小：70K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Philips Semiconductors
Product specification
Switched-mode power supply control circuit
NE/SE5561
DESCRIPTION
PIN CONFIGURATION
The NE5561/SE5561 is a control circuit for use in switched-mode
power supplies. It contains an internal temperature- compensated
supply, PWM, sawtooth oscillator, overcurrent sense latch, and
output stage. The device is intended for low cost SMPS applications
where extensive housekeeping functions are not required.
D, FE, N Packages
1
8
7
6
5
V
GND
CC
2
3
4
OUTPUT
V
Z
FEEDBACK
GAIN
CURRENT SENSE
FEATURES
R , C
T
T
• Micro-miniature (D) package
• Pulse-width modulator
Figure 1. Pin Configuration
• Current limiting (cycle-by-cycle)
• Sawtooth generator
APPLICATIONS
• Stabilized power supply
• Switched-mode power supplies
• DC motor controller inverter
• DC/DC converter
• Double pulse protection
• Internal temperature-compensated reference
ORDERING INFORMATION
DESCRIPTION
TEMPERATURE RANGE
0 to +70°C
ORDER CODE
NE5561N
DWG #
SOT97-1
SOT97-1
0580A
8-Pin Plastic Dual In-Line Package (DIP)
8-Pin Plastic Dual In-Line Package (DIP)
8-Pin Ceramic Dual In-Line Package (CERDIP)
8-Pin Small Outline (SO) Package
-55 to +125°C
-55 to +125°C
0 to +70°C
SE5561N
SE5561FE
NE5561D
SOT96-1
BLOCK DIAGRAM
R , C
T
T
5
REF
VOLTAGE
SAWTOOTH
GENERATOR
V
CC
+
–
–
+
ERROR
AMP
7
OUTPUT
S
3
LATCH
R
FEEDBACK
GAIN
PWM
4
0.5V
8.2V
STABILIZED
SUPPLY
V
Z
2
1
8
6
V
CURRENT
SENSE
CC
GND
SL00385
Figure 2. Block Diagram
1
1994 Aug 31
853-0889 13721
Philips Semiconductors
Product specification
Switched-mode power supply control circuit
NE/SE5561
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
RATING
UNIT
1
V
CC
Supply
Voltage-forced mode
Current-fed mode
+18
30
V
mA
Output transistor (at 20-30V max)
Output current
I
40
mA
V
OUT
V
Output voltage
V
+1.4V
OUT
CC
Output duty cycle
98
%
P
Maximum total power dissipation
Operating temperature range
SE5561
0.75
W
D
T
A
-55 to +125
0 to 70
°C
°C
NE5561
NOTES:
1. See Voltage-Current-fed supply characteristic curve.
DC ELECTRICAL CHARACTERISTICS
V
CC
=12V, T =25°C, unless otherwise specified.
A
SE5561
Typ
NE5561
SYMBOL
PARAMETER
TEST CONDITIONS
UNIT
Min
Max
Min
Typ
Max
Reference section
V
Internal ref voltage
T =25°C
3.69
3.65
7.8
3.75
3.84
3.88
8.8
3.57
3.55
7.8
3.75
3.96
3.98
8.8
V
V
REF
A
Over temperature
V
Z
Internal zener ref
*I =7mA
L
8.2
8.2
V
Temp. coefficient of V
Temp. coefficient of V
±100
±200
±100
±200
ppm/°C
ppm/°C
REF
Z
Oscillator section
Frequency range
Over temperature
50
0
100k
98
50
0
100k
98
Hz
%
Initial accuracy
R and C constant
5
5
T
T
Duty cycle range
f =20kHz
O
%
Current limiting
I
IN
Input current
Pin 6=250mV
T =25°C
-2
-10
-20
-2
-10
-20
µA
µA
A
Over temp.
Inhibit delay
time for 20%
overdrive at
Single pulse inhibit delay
I
=20mA
0.88
1.10
0.88
1.10
µs
OUT
OUT
I
=40mA
0.7
0.8
0.7
0.8
µs
Current limit trip level
.400
.500
.600
.400
.500
.600
V
Error amplifier
Open-loop gain
60
3
60
3
dB
Ω
Feedback resistor
10k
6.2
10k
6.2
BW
Small-signal bandwidth
Output voltage swing
Output voltage swing
MHz
V
V
OH
OL
V
0.7
0.4
0.7
0.4
V
Output stage
I
Output current
Sat
Over temperature
20
20
mA
V
OUT
V
CE
I =20mA, Over temp.
C
2
1994 Aug 31
Philips Semiconductors
Product specification
Switched-mode power supply control circuit
NE/SE5561
DC ELECTRICAL CHARACTERISTICS
V
CC
=12V, T =25°C, unless otherwise specified.
A
SE5561
Typ
NE5561
SYMBOL
PARAMETER
TEST CONDITIONS
UNIT
Min
Max
Min
Typ
Max
Supply voltage/current
T =25°C
10.0
13.0
22.0
30.0
10.0
13.0
24.0
30.0
I =0,
voltage-forced
A
Z
I
Supply current
Supply voltage
mA
V
CC
Over temp.
I
=10mA, current-fed
20.0
20.0
21.0
9
19.0
20.0
21.0
9
CC
V
CC
I
=30mA current
CC
Low supply protection
Pin 1 threshold
8
10.5
8
10.5
V
3
1994 Aug 31
Philips Semiconductors
Product specification
Switched-mode power supply control circuit
NE/SE5561
TYPICAL PERFORMANCE CHARACTERISTICS
Error Amplifier
Open-Loop Gain
Error Amplifier
Open-Loop Phase
Transfer Curve of Pulse-Width
Modulator Duty Cycle vs Input Voltage
60
50
40
30
20
10
0
0
–30
100
90
80
70
60
50
40
30
20
10
0
–60
–90
–120
–150
–180
0
1
2
3
4
5
6
1k
10k
100k
1M
10M
1k
10k
100k
1M
10M
V4
FREQUENCY (Hz)
FREQUENCY (Hz)
Power Derating Curve
Typical Frequency Plot vs R and C
T
T
1000
100
1.25
1.00
0.75
0.50
0.25
0
P
= V
I
+ (V – V ) I
CC Z
R=5kΩ
T
CC CC
7 7
Z
+ [V x DUTY CYCLE]
I
50
30
20
2
5
R=10kΩ
R=20kΩ
NE5561
R
T
10
5
R=40kΩ
3
NE
C
T
2
SE
1
3.5
C (nF)
4
2
2.5
3
4.5
50
70
125
25
100
150
AMBIENT TEMPERATURE (°C)
Maximum Duty Cycle vs
Base Voltage on Q1
Start-Up Circuit
Slow-Start Voltage
100
V4
δ MAX (%)
90
80
70
60
50
40
30
20
10
0
V
Z
2
4
NE5561
R1
R2
V1
Q1
C
0
1
2
3
4
5
t
t = R’C
V1
R2
)
a function of f ƪ
ƫ
d
max is
V
) V
Z
BEQ1
R1
R2
SL00386
Figure 3. Typical Performance Characteristics
4
1994 Aug 31
Philips Semiconductors
Product specification
Switched-mode power supply control circuit
NE/SE5561
initially going to the extreme maximum (δ>90%). Either overcurrent
limit or slow-start circuitry must be employed to limit duty cycle to a
safe value during start-up. Both may be used, if desired.
NE5561 Voltage-Current-Fed
Supply Characteristics
To implement slow-start, the start-up circuit can be used. The divider
R1 and R2 sets a voltage, buffered by Q1, such that the output of
the error amplifier is clamped to a maximum output voltage, thereby
limiting the maximum duty cycle. The addition of capacitor C will
cause this voltage to ramp-up slowly when power is applied, causing
the duty cycle to ramp-up simultaneously.
mA
20
10
Overcurrent limit may be used also. To limit duty cycle in this mode,
the switch current is monitored at Pin 6 and the output of the 5561 is
disabled on a cycle-by-cycle basis when current reaches the
programmed limit. With current limit control of slow-start, the duty
cycle is limited to that value, just allowing maximum switch current
to flow. (Approximately 0.50V measured at Pin 6.)
V
0
0
10
20
30
Current-Fed Dropping Resistor
APPLICATIONS
VS
5V, 0.5A Buck Regulator Operates from 15V
The converter design shows how simple it is to derive a TTL supply
from a system supply of 15V (see Figure 1). The NE5561 drives a
2N4920 PNP transistor directly to provide switching current to the
inductor.
R
VCC
V
1
CC
Overall line regulation is excellent and covers a range of 12V to 18V
with minimal change (<10mV) in the output operating at full load.
GND
8
As with all NE5561 circuits, the auxiliary slow start and δ
circuit
MAX
is required, as evidenced by Q1. The δ
limit may be calculated
MAX
by using the relationship:
V
V
S
CC
R
R2
VCC
(10 20mA)
(8.2V)
VdMAX
R1 ) R2
NOTE:
See DC Electrical Characteristics for Current Fed V
Range.
CC
SL00387
The maximum duty cycle is then determined from the pulse-width
modulator transfer graph, with R1 and R2 being defined from the
desired conditions.
Figure 4. NE5561 Voltage-Current-Fed Supply Characteristics
NE5561 START-UP
The start-up, or initial turn-on, of this device requires some degree of
external protective duty cycle limiting to prevent the duty cycle from
5
1994 Aug 31
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