FA5301N [FUJI]
Switching Controller, Current-mode, 0.02A, 65kHz Switching Freq-Max, BIPolar, PDSO16, SOP-16;
| 型号： | FA5301N |
| 厂家： | 
FUJI ELECTRIC |
| 描述： | Switching Controller, Current-mode, 0.02A, 65kHz Switching Freq-Max, BIPolar, PDSO16, SOP-16 开关 |
| 文件： | 总5页 (文件大小：66K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Bipolar IC
For Switching Power Supply Control
FA5301BP(N)
■ Description
■ Dimensions, mm
The FA5301BP(N) is a bipolar IC containing basic circuits
necessary for PWM-type switching power supply control.
This IC switches an external transistor according to external
Á SOP-16
9
16
synchronizing pulses.
■ Features
• External synchronization input terminal
• Wide supply voltage range (VCC =7 to 22V)
• Open-collector output
8
1
0.33
9.9±0.1
• Soft-start from standby mode
• Double protection of output transistor by overcurrent limiting
and cutoff functions
0.65
0.42±0.07
1.27±0.2
• Output ON/OFF control function
• Not many external discrete components needed
Á DIP-16
16
9
■ Applications
• Switching power supply for general equipment
(Optimum for TV, display, and other monitor devices)
1
8
19.4
1.5
0.81
7.6
0.5±0.1
2.54±0.25
■ Block diagram
Pin Pin
No. symbol
Description
1
2
IN (–)
IN (+)
Inverting input to error amplifier
Non-inverting input to error
amplifier
3
4
5
6
ER.OUT Error amplifier output
FB
IS
Feedback input
Overcurrent detection
CD
Overcurrent cutoff delay
capacitor
7
GND
Ground
8
ON/OFF Output ON/OFF control
9
OUT
DT
Output
10
11
12
Dead time adjustment
Oscillator timing capacitor
CT
CSY
External synchronizing signal
detection capacitor
13
14
15
16
SYNC
CSO
REF
External synchronization input
PWM soft-start capacitor
Reference voltage output (5V)
Power supply
VCC
1
FA5301BP(N)
■ Absolute maximum ratings
■ Recommended operating conditions
Item
Symbol
VCC
Rating
Unit
V
Item
Symbol Min. Max.
Unit
V
Supply voltage
Output voltage
22
22
5
Supply voltage
Error amplifier input voltage
Output current
VCC
VI
7
0
20
VO
V
VREF-2
20
V
IOM
mA
IO
mA
kΩ
pF
kΩ
kHz
kHz
%
Error amplifier output
current
Error amplifier feedback resistor RNF
33
100
8.2
1
VI
5
V
V
Error amplifier input
voltage
Oscillator timing capacitor
Oscillator timing resistor
Free run oscillation frequency
Synchronized frequency
Frequency ratio
CT
10,000
220
RT
Overcurrent detection
terminal input voltage
VIS
20
fOSC
fSYNC
200
Feedback terminal input voltage
VFB
20
6
V
V
1
200
Output ON/OFF terminal
input voltage
VON/OFF
CSY=OV –35 –5
fOSC – fSYNC *3
–30
+10
%
CSY:
VSYNC
Pd
6
V
Capacitor
is connected
to GND
Synchronizing terminal
input voltage
fSYNC
1000 (DIP-16) *1 mW
400 (SOP-16) *2
Total power dissipation
Notes:
1
2
Derating factor Ta > 25°C : 10.0mW/°C (on PC board)
Derating factor Ta > 25°C : 4.0mW/°C (on PC board)
fosc – fSYNC
Consider the tolerance of
fSYNC
*
*
Operating temperature
Storage temperature
Topr
Tstg
–20 to +85
°C
°C
–40 to +150
3
*
■ Electrical characteristics (Ta = 25°C, VCC = 9V, RT = 47kΩ, CT = 1000pF)
Reference voltage section
Item
Symbol
VREF
LINE
Test condition
IOR = 1mA
Min.
Typ.
5.00
10
10
1
Max.
5.25
25
Unit
Output voltage
4.75
V
Line regulation
VCC = 8 to 20V
IOR = 0.1 to 2mA
Ta = –20 to +25°C
Ta = +25 to +85°C
mV
mV
%
Load current regulation
LOAD
VTC1
VTC2
IOS
25
Output voltage variation by temperature fluctuation
1
%
Output current at output short-circuit
25
mA
Oscillator section
Item
Symbol
fOSC
Test condition
CT = 1,000pF, RT = 47kΩ
VCC = 8 to 20V
Min.
Typ.
Max.
22
Unit
kHz
%
Oscillation frequency
20
21
Frequency variation by line voltage fluctuation
Frequency variation by temperature fluctuation
fdV
2
fdt1
Ta = +25 to –20°C
Ta = +25 to +85°C
VSYNC = 1V
–2
–2
+2
%
fdt2
+2
%
Input current to synchronizing signal terminal
ISYNC1
ISYNC2
ICSY1
ICSY2
300
–60
–130
200
0.7
600
–300
–260
400
1.0
µA
µA
µA
µA
V
VSYNC = –0.5V
Input current to synchronizing signal detection terminal
Pin 12 = 0V, VSYNC = –0.5V –65
Pin 12 = 1V, VSYNC = 1V
Threshold voltage of synchronizing signal detection terminal VTH CSY
Error amplifier section
Item
Symbol
VIO
Test condition
Min.
Typ.
Max.
10
Unit
mV
µA
V
Input offset voltage
–10
Input bias current
II
1
Common-mode input voltage
Open-loop voltage gain
Unity-gain bandwidth
Common-mode signal rejection ratio
Maximum output voltage
VCM
AV
0
VREF–2
70
95
0.8
80
4
dB
MHz
dB
V
GB
CMRR
VOM+
VOM–
IOM–
IOM = –50µA
IOM = 50µA
VOM = 1V
0.5
V
Output sink current
170
240
µA
2
FA5301BP(N)
PWM comparator section
Item
Symbol
IBFB
Test condition
VFB = 1V
Min.
Typ.
–2.0
3.3
Max.
Unit
µA
V
Input bias current (Pin 4)
Input threshold voltage (Pin 4)
–10.0
VTH0
Duty cycle = 0%
Duty cycle = 100%
Pin 14 = 3V, VFB = 0V
VTH100
ICSO
0.2
V
Soft-start signal pin input current
2.0
10.0
µA
Dead time adjustment circuit section
Item
Symbol
IBDT
Test condition
Pin 10 = 1V
Min.
Typ.
–0.5
3.2
Max.
Unit
µA
V
Input bias current
Input threshold voltage
–5
VTH DT0
VTH DT100
VSAT RS
Duty cycle = 0%
Duty cycle = 100%
Pin 10 = –100µA
0.1
V
Reset saturation voltage
0.25
0.8
V
Overcurrent limiting circuit section
Item
Symbol
IBIS
Test condition
Min.
0.5
Typ.
Max.
–1
Unit
µA
V
Input bias current (Pin 5)
VIS = 0.3V
Input threshold voltage (Pin 5)
Source current of overcurrent cutoff terminal
Latch-mode threshold voltage
Reset saturation voltage (Pin 6)
VTH IS
IO CD
0.6
0.7
Pin 6 = 0V, VIS = 1V
–450
2.2
–700
2.6
µA
V
VTH LA
VSAT RS
1.8
Pin 6 = 100µA, VIS = 0V
0.75
1.0
V
Output section
Item
Symbol
ILEAK
VOL
Test condition
VO = 22V, output OFF
IO = 10mA
Min.
Typ.
Max.
10
Unit
µA
V
Output leakage current
L-level output voltage
Output sink current limit
0.4
40
0.7
55
ISINK
VO = 3V
25
mA
Output ON/OFF control circuit section
Item
Symbol
IBON
Test condition
Pin 8 = 0V
Min.
Typ.
–60
2.50
2.30
0.2
Max.
–300
2.87
2.64
Unit
µA
V
Input bias current (Pin 8)
OFF-to-ON threshold voltage
ON-to-OFF threshold voltage
Voltage hysteresis
VTH ON
VTH OFF
VHYS
OFF→ON
2.13
1.96
ON→OFF
V
V
Overall device
Item
Symbol
ICC LA
Test condition
Min.
Typ.
8.0
Max.
12.0
9.8
Unit
mA
mA
Supply current
RT = 47kΩ, latch mode
Operating-state supply current
ICC AV
R
T
= 47kΩ, duty cycle = 50%
6.5
3
FA5301BP(N)
■ Characteristic curves (Ta = 25°C)
Oscillation frequency (fOSC) vs. timing
resistor resistance (RT)
Output duty cycle vs. DT terminal voltage (VDT)
1000
500
CT=100pF
100
50
10
5
470pF
680pF
1000pF
1500pF
2200pF
1
7
10
20
50
100
200
500
RT [kΩ]
Output duty cycle vs. FB terminal voltage (VFB)
L-level output voltage vs. output sink current (ISINK)
Supply current (ICC) vs. supply voltage (VCC)
Error amplifier frequency (f) vs.voltage gain(Av)/ phase (θ)
4
FA5301BP(N)
■ Application circuit
Á Switching power supply (primary current control and insulated output type)
This circuit uses the following functions.
• Horizontal synchronizing function
• Overcurrent limiting function
• Overcurrent cutoff function
• Undervoltage input cutoff function
• Soft-start function
Parts tolerances characteristics are not defined in the circuit design
sample shown above. When designing an actual circuit for a product,
you must determine parts tolerances and characteristics for safe and
economical operation.
5
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