Fuji FA7611CPE Bipolar ic for switching power supply control Datasheet

FA7611CP(E)
FA7611CP(E)
Bipolar IC
For Switching Power Supply Control
■ Description
■ Dimensions, mm
The FA7611CP(E) is a bipolar IC containing basic circuit
necessary for PWM-type switching power supply control.
Á SSOP-16
0.65
2.1max
+0.1
8
6.2
0.3
0.2 –0.05
1
0~10˚
■ Applications
5.3
7.9±0.3
• Low-voltage operation (VCC = 3.6 to 22V)
• Predrivers: Totem-pole output or open-collector for CH1 and
open-collector output for CH2
• Latch-mode short-circuit protection function (no malfunction
due to electrical noise)
• soft-start function
• Undervoltage lock-out function
• One capacitor shared for short circuit protection and for soft start
to minimize the number of external discrete components
9
16
0.1±0.1
■ Features
0.6
• Battery power supply for portable equipment
Á DIP-16
16
6.5
9
8
19.4
1.5
0.2min
3.4
0.81
0.5±0.1
2.54±0.25
■ Block diagram
+0.1 5
.0
0.3 –0
7.6
0~15
˚
5˚
0~1
Pin
No.
Pin
symbol
Description
1
CT
CS
Oscillator timing capacitor
DT2
IN2 (+)
Dead time adjustment
IN2 (–)
FB2
GND
OUT2
VCC
Inverting input to error amplifier
OUT1R
OUT1
FB1
IN1 (–)
IN1 (+)
CH. 1 Current limiting resistor
DT1
REF
Dead time adjustment
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
3.1min 4.3max
1
Capacitor for soft-start, shortcircuit protection and delay
Non-inverting input to error
amplifier
Error amplifier output
Ground
CH. 2 Output
Power supply
CH. 1 Output
Error amplifier output
Inverting input to error amplifier
Non-inverting input to error
amplifier
Reference voltage (0.5V)
Reference voltage output (2.5V)
FA7611CP(E)
■ Absolute maximum ratings
■ Recommended operating conditions
Item
Symbol
Rating
Unit
Item
Symbol
Min.
Max.
Unit
Supply voltage
VCC
IOR
IO
Pd
22
V
Supply voltage
3.6
20
V
5
mA
Feedback resistance
±50
mA
Oscillator timing capacitor
400
mW
Oscillator timing resistance
VCC
RNF
CT
RT
Topr
Tstg
–20 to +85
°C
Oscillation frequency
fOSC
–40 to +150
°C
Reference voltage output current
Output current
Total power dissipation
Operating temperature
Storage temperature
100
kΩ
220
22,000
pF
10
100
kΩ
5
200
kHz
■ Electrical characteristics (Ta = 25°C, VCC = 6V, RT = 33kΩ, CT = 1000pF)
Reference voltage section
Item
Symbol
Test condition
Output voltage
VREF
LINE
LOAD
VTC1
IOR = 1mA
2.425
VCC = 3.6 to 20V, IOR =1mA
IOR = 0.1 to 1mA
Ta = –20 to +25°C
VTC2
Ta = +25 to +85°C
Item
Symbol
Test condition
Min.
Oscillation frequency
CT = 1000pF, RT = 33kΩ
VCC = 3.6 to 20V
95
Frequency variation 1 (due to supply voltage change)
fOSC
fdV
Frequency variation 2 (due to temperature change)
fdT
Ta = –20 to +85°C
Item
Symbol
Test condition
Reference voltage
VB
Input bias current
IB
AV
GB
VOM+
VOM–
Line regulation
Load regulation
Output voltage variation due to temperature change
Min.
Typ.
Max.
Unit
2.475
2.525
V
4
12
mV
1
6
mV
–1
1
%
–1
1
%
Typ.
Max.
Unit
115
135
kHz
Oscillator section
1
%
5
%
Error amplifier section
Open-loop voltage gain
Unity-gain bandwidth
Maximum output voltage (Pin 6 and Pin 12)
Min.
Typ.
Max.
Unit
0.484
0.494
0.504
V
5
100
70
0.6
RNF = 100kΩ
MHz
VREF–0.2
V
RNF = 100kΩ
200
mV
200
µA
Unit
IOM+
VOM = 1V
40
Item
Symbol
Test condition
Min.
Typ.
Max.
Input threshold voltage (Pin 6 and Pin 12)
VTH0
VTH50
Duty cycle = 0%
0.85
0.95
Duty cycle = 50%
1.1
Output source current (Pin 6 and Pin 12)
nA
dB
85
PWM comparator section
Input threshold voltage (Pin 6 and Pin 12)
V
V
2
FA7611CP(E)
Dead time adjustment circuit section
Item
Symbol
Input bias current (Pin 3 and Pin 15)
IBDT
VTH DT0
VTH DT50
Item
Symbol
Test condition
Input threshold voltage (Pin 6 and Pin 12)
VTH PC
ICHG
VTH LA
Pin 2 = 0V, Pin 6, Pin 12 = 2V 10
Item
Symbol
Test condition
OFF-to-ON threshold voltage
VTH ON
VTH OFF
VHYS
Input threshold voltage (Pin 3 and Pin 15)
Input threshold voltage (Pin 3 and Pin 15)
Test condition
Min.
Typ.
Max.
Unit
80
300
nA
Duty cycle = 0%
0.22
0.32
Duty cycle = 50%
0.46
V
V
Short-circuit protection circuit section
Charge current (Pin 2)
Latch-mode threshold voltage (Pin 2)
Min.
Typ.
Max.
Unit
1.20
1.50
1.80
V
30
50
µA
1.20
1.50
1.80
V
Min.
Typ.
Max.
Unit
Undervoltage lockout circuit section
ON-to-OFF threshold voltage
Voltage hysteresis
2.65
V
2.60
V
50
mV
Output section
Item
Symbol
Test condition
Min.
CH. 1 H-level output voltage (Pin 11)
V01H
V01L
ISOURCE1
RL = 10kΩ
3.5
CH. 1 L-level output voltage (Pin 11)
CH. 1 Output source current (Pin11)
Output sink current = 20mA
ROUT1 = 470Ω
Typ.
4.0
0.25
8
Max.
Unit
V
0.65
11
V
mA
(Pin 11) = 0V
V02L
Output sink current = 20mA
Item
Symbol
Test condition
Supply current
ICC LA
ICC AV
Latch mode
RL = ∞ Duty cycle = 50%
3.5
CH. 2 L-level output voltage (Pin 8)
1.0
1.5
V
Typ.
Max.
Unit
2.0
3.0
mA
6.0
mA
Overall device
Operating-state supply current
3
Min.
FA7611CP(E)
■ Characteristic curves (Ta = 25°C)
Oscillation frequency (fOSC ) vs.
timing capacitor capacitance (C T)
Output duty cycle vs. CS terminal voltage (VCS )
Output duty cycle vs. DT terminal voltage (VDT)
Output duty cycle vs. FB terminal voltage (VFB)
CH-1 output source current (ISOURCE1) vs.
supply voltage (VCC )
L-level output voltage (VO1L ) vs.
CH. 1 output sink current (ISINK1 )
4
FA7611CP(E)
L-level output voltage (VO2L)
vs. CH. 2 output sink current (ISINK2)
Supply current (ICC) vs. supply voltage(VCC)
Operating-state supply current (ICCAV) vs.
oscillation frequency (fOSC)
Phase θ [deg]
Error amplifie frequency (f) vs. valtage gain (AV) / phase (θ)
5
FA7611CP(E)
■ Application circuit
Á Flyback-transformer type and chopper type buck converter circuit
Flyback
24V
TR
VCC
3.3k
+
– C1
63.5k
D10
+
– C11
D11
+
– C12
D12
–
+ C13
10V
1k
100k
Q1
22k
–10V
0.01µ
22000p
Rout1
1M
16
15
14
13
12
11
10
9
REF DT1 IN1(+) IN1(–) FB1 OUT1 OUT1R VCC
VCC
+
– C2
FA7611CP(E)
CT
CS
1
2
DT2 IN2(+)IN2(–) FB2
3
4
5
GND OUT2
6
7
8
L2
1M
Buck
5V
Q2
R21
4.7µ
56k
1000p
R20
0.01µ
D20
330k
+
–
C20
1k
820k
2.2k
20.07k
Á Chopper type buck converter and inverting converter circuit
3.3k
30.1k
L1
1k
0.01µ
Buck
5V
Q1
R11
Rout1
+
– C10
22000p
D10
VCC
16
15
REF
DT1
14
IN1(+)
13
IN1(–)
12
FB1
11
OUT1
10
OUT1R
+
– C1
9
VCC
VCC
FA7611CP(E)
CT
CS
DT2
IN2(+)
IN2(–)
FB2
GND
OUT2
1
2
3
4
5
6
7
8
+
– C2
R21
R20
Q2
56k
330k
1000p
D20
+
4.7µ
–
Inverting
–5V
47000p
L2
820k
–
+ C20
1k
100k
2.2k
22k
5.02k
Parts tolerances characteristics are not defined in the circuit design
Please connect a capacitor, which the value is about 0.01 µF to 0.1µF,
sample shown above.
between VCC and REF terminals in order to prevent from irregular
When designing an actual circuit for a product, you must determine
output pulse at start-up.
parts tolerances and characteristics for safe and economical
operation.
6
Similar pages