ADDtek AMC7660DM Dc - dc converter control circuit Datasheet

AMC7660
DC - DC CONVERTER
CONTROL CIRCUIT
www.addmtek.com
DESCRIPTION
FEATURES
„
The AMC7660 is designed for the applications which
require DC - DC converters. It can be operated in a wide
input range from 3.0V to 40V and has the controlled duty
cycle oscillator, driver and high current output switch.
Also, With the internal temperature compensation circuit,
the AMC7660 provides an internally trimmed precision
1.5% reference voltage of 1.25V. These features make the
AMC7660 suitable for step-up, step-down and
voltage–inverting applications.
„
„
„
„
„
„
Internally trimmed 1.5% 1.25V Reference
Voltage
Wide Input Operating Range: 3.0V to 40V
Output Switch Current up to 1.5A
Low Standby Current
100KHz operational Frequency
Adjustable Output Voltage
Available in 8 Pin Plastic DIP and 8 Pin S.O
Packages
APPLICATIONS
„
„
„
„
„
„
„
„
PACKAGE PIN OUT
Automobile Chargers
Adaptors
Mother Board
External Modem
ISDN Modem
Scanner
Cellular Phones/Radios
Laptop/Notebook
OC1
1
8
OC2
E1
2
7
IS
CT
3
6
VCC
GND
4
5
VIN-
M
PACKAGE
(TOP VIEW)
OC1
1
8
OC2
E1
2
7
IS
CT
3
6
VCC
GND
4
5
VIN-
DM
PACKAGE
(TOP VIEW)
ORDER INFORMATION
TA (OC)
0 to 70
0 to 70
Note:
Plastic DIP
8-pin
AMC7660M
AMC7660MF(Lead Free)
Plastic SO-8
8-pin
AMC7660DM
AMC7660DMF(Lead Free)
M
1.All surface-mount packages are available in Tape & Reel.
2.The letter ”F” is marked for Lead Free process.
Copyright © 2006 ADDtek Corp.
DM
Append the letter “T” to part number (i.e. AMC7660DMT).
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AMC7660
ABSOLUTE MAXIMUM RATINGS
Power Supply Voltage (VCC) ………………………………………………………………………………..…40V
Operating Junction temperature
Plastic (M, DM Package) …………………………………………………………………………….…….. 150 OC
Storage Temperature Range …………………………………………………………………...…. -65 OC to 150 OC
Lead temperature (Soldering, 10 seconds) …………………………………………………………..………300 OC
Note 1: Exceeding these ratings could cause damage to the device.
negative out of the specified terminal.
All voltages are with respect to Ground. Currents are positive into,
THERMAL DATA
M PACKAGE:
Thermal Resistance-Junction to Ambient, θJA
DM PACKAGE:
Thermal Resistance-Junction to Ambient, θJA
95 OC/W
165 OC/W
BLOCK DIAGRAM
IS
VCC
7
6
OC2 8
5 VINS
Q
Q2
OC1 1
R
1.25V
Q1
100
I sense
E1 2
CT
Oscillator
4 GND
3
CT
Copyright © 2006 ADDtek Corp.
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AMC7660
RECOMMENDED OPERATING CONDITIONS
Recommended Operating
Parameter
Symbol
Min.
Typ.
Max.
VIR
Comparator Input Voltage
-0.3 to + 40
VOC1
Switch Collector Voltage
40
VE1
Switch Emitter Voltage (VPin1=40V)
40
V
Switch Collector to Emitter Voltage
40
CE1
VC2
Driver Collector Voltage
40
IC2
Driver Collector Current (Note 1)
100
ISWITCH
Switch Current
1.5
CT
Oscillator Timing Capacitor (connected to CT pin)
1.0
Operating Ambient Temperature Range
TA
0 to +70
Units
V
V
V
V
V
mA
A
nF
°C
Note 1: Maximum package power dissipation limits must be observed.
ELECTRICAL CHARACTERISTICS
VCC=5.0 V, TA=0 C to 70 C, unless otherwise specified.
O
O
Parameter
Symbol
OSCILLATOR
Frequency
Fosc
Charge Current
Ichg
Discharge Current
Idischg
Discharge to Charge Current Ratio
Idischg/Ichg
Current Limit Sense Voltage
VIS
OUTPUT SWITCH
Saturation Voltage, Darlington Connection VCE1(sat)
Saturation Voltage
DC Current Gain
Collector Off-State Current
VCE1(sat)
hFE
IC(off)
Test Conditions
O
VIN- = 0 V, CT = 1.0 nF, TA = 25 C
VCC = 5.0 V to 40 V, TA = 25 OC
VCC = 5.0 V to 40 V, TA = 25OC
IS to VCC, TA = 25 OC
Ichg = Idischg, TA = 25 OC
ISW = 1.0 A, OC1, OC2 connected
ISW = 1.0 A, 82 Ω connected from
OC2 to VCC, Forced β = 20
ISW = 1.0 A, VCE = 5.0 V, TA = 25
O
C
VCE = 40 V
AMC7660
Min. Typ. Max.
Units
24
24
140
5.2
250
33
35
220
6.5
300
42
42
260
7.5
350
KHz
µA
µA
mV
-
0.9
1.3
V
-
0.4
0.7
V
50
75
-
-
-
0.01
100
µA
COMPARATOR
Threshold Voltage
Threshold Voltage Line Regulation
Input Bias Current
Vth
Vth(line)
IIB
TA = 25 OC
TA =0 OC to 70 OC
VCC = 3.0 V to 40 V
VIN- = 0 V
1.23 1.25 1.27
1.22
1.28
1.4 5.6
-20 -400
V
mV
nA
TOTAL DEVICE
Supply current
Copyright © 2006 ADDtek Corp.
ICC
VCC = 5.0 V to 40 V,
CT = 1.0nF, Pin 7 = VCC,
VIN- > Vth, Pin 2= Gnd, remaining
pins open
3
-
3.0
3.9
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AMC7660
CHARACTERIZATION CURVES
VCC = 5V, Pin 1, 5, 8 open
VCC = 5V, Pin 1, 5, 8 open
CT = 470pF
CT = 470pF
CT pin (PIN#3) waveform
CT pin (PIN#3) waveform
VCC = 5V, Pin 1, 5, 8 open
VCC = 25V, Pin 1, 5, 8 open
CT = 470pF
CT = 470pF
CT pin (PIN#3) waveform
CT pin (PIN#3) waveform
VCC = 25V, Pin 1, 5, 8 open
VCC =25V, Pin 1, 5, 8 open
CT = 470pF
CT = 470pF
CT pin (PIN#3) waveform
Copyright © 2006 ADDtek Corp.
CT pin (PIN#3) waveform
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AMC7660
CHARACTERIZATION CURVES
VCC = 5V, Pin 1, 5, 8 open
VCC = 5V, Pin 1, 5, 8 open
CT = 1nF
CT = 1nF
CT pin (PIN#3) waveform
CT pin (PIN#3) waveform
VCC = 5V, Pin 1, 5, 8 open
VCC = 25V, Pin 1, 5, 8 open
CT = 1nF
CT = 1nF
CT pin (PIN#3) waveform
CT pin (PIN#3) waveform
VCC = 25V, Pin 1, 5, 8 open
VCC =25V, Pin 1, 5, 8 open
CT = 1nF
CT = 1nF
CT pin (PIN#3) waveform
Copyright © 2006 ADDtek Corp.
CT pin (PIN#3) waveform
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AMC7660
CHARACTERIZATION CURVES
VCC = 25V, 500mA load
VCC = 25V, 500mA load
23.3V
CT = 470pF
CT = 470pF
CT pin waveform
- 0.8V
5V output
E1 pin (PIN#2) waveform
Step down 5V output performance
on 5V step down converter
Copyright © 2006 ADDtek Corp.
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AMC7660
Figure 1 – Step-Up Converter Application Circuits
47K
V IN
12V
R1
0.22
Rsc
7
100uF
6
180
8
5
OC2
170uH
VOUT
28V/175mA
OC1
1
Co
D1
330uF
Q
Q2
R2
2.2K
S
R
1.25V
Q1
100
I sense
2
Oscillator
CT
4
3
1.5nF
Figure 2 – Step-Down Converter Application Circuit
3.6K
V IN
25V
R1
0.33
Rsc
7
8
100uF
6
5
OC2
1
OC1
Q2
Q
R
R2
1.2K
S
1.25V
Q1
VOUT
5V/500mA
100
220uH
Co
470uF
I sense
2
Oscillator
CT
D1
4
3
470pF
Copyright © 2006 ADDtek Corp.
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AMC7660
Figure 3 – Voltage Inverting Converters
953
Co
1000uF
V IN
4.5V to 6.0V
R2
0.24
Rsc
7
8
100uF
6
5
OC2
8.2K
S
V OUT
-12V/100mA
1
OC1
Q2
Q
R
R1
1.25V
Q1
100
D1
I sense
2
CT
88uH
Oscillator
4
3
1.5nF
Note: For step-up, step-down or voltage inverting applications requiring peak current greater than 1.5A, external boost current circuitry by NPN or
PNP transistors can be used.
Copyright © 2006 ADDtek Corp.
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AMC7660
Typical Design Reference Table:
Calculation
Step-Down
Step-Up
Voltage-Inverting
ton/toff
Vout + VF
Vin(min) − Vsat− Vout
Vout + VF − Vin(min)
Vin(min) − Vsat
?Vout? + VF
Vin − Vsat
ton + toff
1
f
1
f
1
f
toff
ton + toff
ton/toff + 1
ton + toff
ton/toff + 1
ton + toff
ton/toff + 1
ton
(ton + toff) − toff
(ton + toff) − toff
(ton + toff) − toff
CT
4.0 × 10 ton
4.0 × 10 ton
4.0 × 10-5 ton
Ipk(switch)
2Iout(max)
2Iout(max) (ton/toff + 1)
2Iout(max) (ton/toff + 1)
RSC
0.3/Ipk(switch)
0.3/Ipk(switch)
0.3/Ipk(switch)
L(min)
-5
( (V
CO
in(min) −
Vsat− Vout)
Ipk(switch)
-5
)t
on(max)
( (V I
in(min) −
Ipk(switch)( ton + toff)
8Vripple(pp)
VF:
Forward Voltage drop of the output rectifier
Vsat:
Saturation voltage of the output switch.
Vsat)
pk(switch)
9
)t
on(max)
( (V I
in(min) −
Vsat)
pk(switch)
Iout ton
Vripple(pp)
9
)t
on(max)
Iout ton
Vripple(pp)
The following power supply characteristics must be chosen:
Vin - Nominal input voltage
Vout - Desired output voltage, ?Vout? = 1.25(1 + R1/R2)
Iout - Desired output current.
fmin – Minimum desired output switching frequency at the selected values of Vin and IO
Vripple(pp) – Desired peak – to – peak output ripple voltage.
Application concerns:
To get the best regulation performance, Low ESR capacitors at Vout are suggested.
Copyright © 2006 ADDtek Corp.
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AMC7660
PACKAGE
8-Pin Plastic DIP
INCHES
5
8
MIN
MAX
MIN
TYP
MAX
A
0.355 0.365 0.400
9.02
9.27
10.16
B
0.240 0.250 0.280
6.10
6.35
7.11
B
1
4
A
L
F
TYP
MILLIMETERS
C
-
-
0.210
-
-
5.33
D
-
0.018
-
-
0.46
-
F
-
0.060
-
-
1.52
-
G
-
0.100
-
-
2.54
-
H 0.050
-
0.090
1.27
-
2.29
J
0.008
-
0.015
0.20
-
0.38
K
0.115 0.130 0.150
2.92
3.30
3.81
L
0.300 BSC.
C
J
K
H
G
M
D
M
-
7º
7.62 BSC.
15º
-
7º
15º
8-Pin Plastic S.O.I.C.
INCHES
A
B
P
F
D
L
C
SEATING PLAN
K
Copyright © 2006 ADDtek Corp.
MIN
TYP
MAX
MIN
TYP
MAX
A
0.183
-
0.202
4.65
-
5.13
B
0.144
-
0.163
3.66
-
4.14
C 0.068
-
0.074
1.73
-
1.88
D 0.010
-
0.020
0.25
-
0.51
F
-
0.035
0.38
-
0.89
0.015
G
G
M
J
10
MILLIMETERS
0.050 BSC
1.27 BSC
J
0.007
-
0.010
0.19
-
0.25
K
0.005
-
0.010
0.13
-
0.25
L
0.189
-
0.205
4.80
-
5.21
M
-
-
8º
-
-
8º
P
0.228
-
0.244
5.79
-
6.20
DD057_C
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AMC7660
IMPORTANT NOTICE
ADDtek reserves the right to make changes to its products or to discontinue any integrated circuit product or service
without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing
orders, that the information being relied on is current.
A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe
property or environmental damage. ADDtek integrated circuit products are not designed, intended, authorized, or
warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of
ADDtek products in such applications is understood to be fully at the risk of the customer. In order to minimize risks
associated with the customer’s applications, the customer should provide adequate design and operating safeguards.
ADDtek assumes to no liability to customer product design or application support. ADDtek warrants the performance of
its products to the specifications applicable at the time of sale.
ADDtek Corp.
9F, No. 20, Sec. 3, Bade Rd., Taipei, Taiwan, 105
TEL: 2-25700299
FAX: 2-25700196
Copyright © 2006 ADDtek Corp.
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