CBM72576HVT-3.3 [COREBAI]
OPERATION INSTRUCTION;
| 型号： | CBM72576HVT-3.3 |
| 厂家： | 
Corebai |
| 描述： | OPERATION INSTRUCTION |
| 文件： | 总17页 (文件大小：1530K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CBM2576HVS-3.3/5.0/12/ADJ
OPERATION INSTRUCTION
FEATURES
APPLICATIONS
3.3 V, 5.0 V, 12 V, and Adjustable Output
Simple High-Efficiency Step-Down (Buck)
Regulator
Versions
Adjustable version output voltage range,
1.23V
Efficient
Pre-Regulator
for
Linear
Regulators
to 57V 土 4% max over line and load
conditions
On-Ca「d Switching Regulators
Positive to Negative
(Buck-Boost)
Negative Step-Up Converters
Power Supply for Battery Chargers
Converter
Output load current: 3A
Input voltage range up to 60V
Requires only 4 external components
52 kHz fixed frequency internal oscillator
TTL shutdown capability, low power
standby mode
High efficiency
Thermal shutdown and current limit
protection
Built-in switching transistor on chip
5-lead T0-220 package
GENERAL DESCRIPTION
The CBM2576HVSseries of regulators are monolithic integrated circuits that provide all the
active functions for a step-down (buck) switching regulator, capable of driving 3A load with
excellent line and load regulation. These devices are available in fixed output voltages of 3.3V,
5.0V, 12V, and adjustable output version. Requiring a minimum number of external components,
these regulators are simple to use and include internal frequency compensation and a
fixedfrequency oscillator.
The CBM2576HVSseries offers a high-efficiency replacement for popular three-terminal
linear regulators. It substantially reduces the size of the heat sink, and in some cases no heat sink
is required. A standard series of inductors optimized for use with the CBM2576HVSare available
from several different manufacturers. This feature greatly simplifies the design of switch-mode
power supplies.
Other features include a guaranteed 士 4% tolerance on output voltage within specified input
voltages and output load conditions, and 士 10% on the oscillator frequency. The external
shutdown function can be controlled by logic level and then come into standby mode. The
output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full
protection under fault conditions.
The CBM2576HVSseries a「e available in a standard 5-lead T0-220 package.
1
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CBM2576HVS-3.3/5.0/12/ADJ
OPERATION INSTRUCTION
Block diagram
Figure 1.
3.3V R2 = 2.02k
5.0V, R2 = 3.69k
12V, R2 = 10.56k
For adjustable version
R1 = Open, R2 = on
Typical Electrical Parameters
Parameter, unit
Symbol
Typ. value
Test condition
CBM2576HVS-ADJ
77
75
77
88
98
VIN = 12V, ILOAD = 3A, VOUT = 5V
CBM2576HVS-3.3
Efficiency,%
VIN = 12V, ILOAD = 3A
CBM2576HVS-5.0
CBM2576HVS-12
VIN = 15V, ILOAD = 3A
VFB = 0V
Max. Duty Cycle {ON), %
DCmax
2
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CBM2576HVS-3.3/5.0/12/ADJ
OPERATION INSTRUCTION
Typical Application (Fixed Output voltage versions)
Figure 2.
C1—aluminum electrolytic capacitor(100uF, 75V);
C2—aluminum electrolytic capacitor(1000uF, 25V);
L1—inductor (100uH);
D1—Schottky diode
Adjustable Output Voltage Versions
Figure 3.
ꢇꢈ
ꢇꢅ
ꢀꢁ弈
ꢀꢂꢃꢄ
ꢀꢁ弈 = ꢀꢂꢃꢄ ꢅth ꢆ
ꢉ
ꢇꢈ = ꢇꢅ
ꢊ ꢅth
Where Vref = 1.23 V, R1 between 1.0 k and 5.0 k
C1 = 10 nF
C2 = 1 nF
3
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CBM2576HVS-3.3/5.0/12/ADJ
OPERATION INSTRUCTION
ABSOLUTE MAXIMUM RATINGS
(Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.)
Rating
Symbol
Value
Unit
Maximum Supply Voltaqe
Vin
63
V
V
V
ON/OFF Pin Input Voltage
-0.3V ≤ V ≤ +25
-0.1
Output Voltaoe to Ground (Steadv-State)
Power Dissipation
TO-220,5-Lead
PD
Internally Limited
W
Thermal Resistance, Junction-to-Ambient
Thermal Resistance, Junction-to-Case
T0-263, 5-Lead (D2PAK)
RθJA
RθJC
PD
65
℃/W
℃/W
W
5.0
Internally Limited
Thermal Resistance, Junction-to-Ambient
Thermal Resistance, Junction-to-Case
Storage Temperature Range
RθJA
RθJC
Tstg
70
℃/W
℃/W
℃
5.0
Minimum ESD Rating (Human Body Model:
C=100pF,R=1.5kΩ)
2.0
kV
Lead Temperature (Soldering, 10 seconds)
260
150
℃
℃
Maximum Junction Temperature
TJ
* 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.
OPERATING RATINGS
(Operating Ratings indicate conditions for which the device is intended to be functional, but do
not guarantee specific performance limits. For guaranteed specifications and test conditions, see
the Electrical Characteristics.)
Rating
Operating Junction Temperature Range
Supply Voltage
Symbol
TJ
Value
-40 to +125
60
Unit
℃
VIN
V
4
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CBM2576HVS-3.3/5.0/12/ADJ
OPERATION INSTRUCTION
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, Vin = 12V for the 3.3V, 5.0V, and Adjustable version, Vin = 25V for
the 12V version, and Vin = 30V for the 15V version. ILoad = 500mA, TJ = 25℃, for min/max values
TJ is the operating junction temperature range that applies unless otherwise noted)
Limit
IC
Parameter, unit
Symbol
Test condition
VFB = 1,3V;
TA,℃
25±10
min
max
100
500
58
CBM2576
HVS-ADJ
Feedback bias current, nA
IB
-
VIN= 12V
VIN= 12V
125*
-40
Oscillator frequency, kHz
Saturation voltage, V
fOSC
VSAT
47
42
-
63
1.8
2,0
VFB = OV;
VIN= 12V;
IOUT = 3A
no external circuit
VFB = OV;
Current limit, A
ICL
4.2
3.5
6.9
7.5
VIN= 12V;
3A ≤ IOUT ≤ 8A
no external circuit
VFB = 12V;
IL(O)
IL(-1)
2
25±10
VIN= 60V;
VOUT = OV
no external circuit
VFB = 12V;
Output leakage current, mA
Quiescent current, mA
30
VIN= 60V;
VOUT =-1V
no external circuit
VFB = 12V;
IQ
10
VIN= 12V
Standby quiescent current,
uA
ISTBY
200
VFB = OV;
VIN= 60V;
VON/OFF =5V
FB = 0V;
ON/OFF pin low level input
voltage (switch on), V
VIL
1.0
0.8
25士10
125*
-40
N = 12V
ON/OFF pin high level input VIH
voltage (switch off), V
2.2
2.4
30
ON/OFF pin high level input IIH
current (switch off}, uA
VFB = 0V;
25±10
VIN= 12V;
VON/OFF = 5V
VFB = 0V;
ON/OFF pin low level input
current (switch on), uA
IIL
10
VIN= 12V;
VON/OFF= 0V
VIN=12V;ILOAD=0.5A;
VOUT = 5V
Feedback voltage, V
VFB
1.217
1.243
1.193
1.180
1.273
1.286
8V ≤ VIN ≤ 60V;
0.5A ≤ ILOAD ≤ 3A;
VOUT = 5V
25±10
125*
-40
5
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CBM2576HVS-3.3/5.0/12/ADJ
OPERATION INSTRUCTION
Limit
IC
Parameter, unit
Symbol
Test condition
TA,℃
min
47
max
58
CBM2576
HVS-3.3
Oscillator frequency, kHz
Saturation voltage, V
fOSC
VIN = 12V
25±10
42
63
125*
-40
VSAT
1.8
2.0
VFB = 0V;
VIN = 12V;
IOUT = 3A
no external circuit
VFB = 0V;
Current limit, A
ICL
4.2
3.5
6.9
7.5
VIN = 12V;
3A ≤ IOUT ≤ 8A;
no external circuit
VFB = 12V;
Output leakage current, mA IL(0)
2
25±10
VIN = 60V;
3A ≤ IOUT ≤ 8A
no external circuit
VFB = 12V;
IL(-1)
30
VIN = 60V;
VOUT = -1V;
no external circuit
VFB = 12V;
Quiescent current, mA
IQ
10
VIN = 12V
Standby quiescent current,
uA
lSTBY
200
VFB = 0V;
VIN = 60V;
VON/OFF = 5V
VFB = 0V;
ON/OFF pin low level input
voltage (switch on), V
VIL
1.0
0.8
25±10
125*
-40
VIN = 12V
ON/OFF pin high level input VIH
voltage (switch off), V
2.2
2.4
30
ON/OFF pin high level input IIH
current (switch off), uA
VFB = 0V;
25±10
VIN = 12V;
VON/OFF = 5V
VFB = 0V;
ON/OFF pin low level input
current (switch on), uA
IIL
-
10
VIN = 12V;
VON/OFF = 0V
VIN = 12V;
Output voltage, V
VOUT
3.234
3.366
VLOAD=0.5A
6V ≤ VIN ≤ 60V;
0.5A ≤ ILOAD ≤ 3A
3.168
3.135
3.450
3.682
25±10
125*
-40
6
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CBM2576HVS-3.3/5.0/12/ADJ
OPERATION INSTRUCTION
Limit
min max
47 58
IC
Parameter, unit
Symbol
Test condition
VIN = 12V
TA,℃
25±10
CBM2576
HVS-5.0
Oscillator frequency, kHz
fSOC
42
63
125*
-40
Saturation voltage, V
Current limit, A
VSAT
1.8
2.0
VFB = 0V;
VIN = 12V;
IOUT = 3A
no external circuit
VFB = 0V;
ICL
4.2
3.5
6.9
7.5
VIN = 12V;
3A ≤ IOUT ≤ 8A
no external circuit
VFB = 12V;
Output leakage current, mA IL(0)
2
25±10
VIN = 60V;
VOUT = 0A
no external circuit
VFB = 12V;
IL(-1)
30
VIN = 60V;
VOUT = -1A
no external circuit
VFB = 12V;
Quiescent current, mA
IQ
10
VIN = 12V
Standby quiescent current,
uA
ISTBY
200
VFB = 0V;
VIN = 60V;
VON/OFF = 5V
VFB = 0V;
ON/OFF pin low level input
voltage (switch on), V
VIL
1.0
0.8
25±10
125*
-40
VIN = 12V
ON/OFF pin high level input VIH
voltage (switch off), V
2.2
2.4
30
ON/OFF pin high level input IIH
current (switch off), uA
VFB = 0V;
25±10
VIN = 12V;
VON/OFF = 5V
VFB = 0V;
ON/OFF pin low level input
current (switch on), uA
IIL
10
VIN = 12V;
VON/OFF = 0V
VIN = 12V;
Output voltage, V
VOUT
4.90
5.10
ILOAD = 0.5A
8V ≤ VIN ≤ 60V;
0.5A ≤ ILOAD ≤ 3A
4.800
4.750
5.225
5.275
25±10
125*
-40
7
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CBM2576HVS-3.3/5.0/12/ADJ
OPERATION INSTRUCTION
Limit
min max
47 58
IC
Parameter, unit
Symbol
Test condition
VIN = 25V
TA,℃
25±10
CBM2576
HVS-12
Oscillator frequency, kHz
FOSC
42
63
125*
-40
Saturation voltage, V
Current limit, A
VSAT
1.8
2.0
VFB = 0V;
VIN = 25V;
IOUT = 3A
no external circuit
VFB = 0V;
ICL
4.2
3.5
6.9
7.5
VIN = 25V;
3A ≤ IOUT ≤ 8A
no external circuit
VFB = 25V;
Output leakage current, mA IL(0)
2
25±10
VIN = 60V;
VOUT = 0V
no external circuit
VFB = 25V;
IL(-1)
30
VIN = 60V;
VOUT = -1V
no external circuit
VFB = 25V;
Quiescent current, mA
IQ
10
VIN = 25V
Standby quiescent current,
uA
ISTBY
VIL
200
VFB = 0V; VIN = 60V;
VON/OFF = 5V
VFB = 0V;
ON/OFF pin low level input
voltage (switch on), V
1.0
0.8
25±10
125*
-40
VIN = 25V
ON/OFF pin high level input VIH
voltage (switch off), V
2.2
2.4
30
ON/OFF pin high level input IIH
current (switch off), uA
VFB = 0V;
25±10
VIN = 25V;
VON/OFF = 5V
VFB = 0V;
ON/OFF pin low level input
current (switch on), uA
IIL
10
VIN = 25V;
VON/OFF = 0V
VIN = 25V;
Output voltage, V
VOUT
11.76
12.24
ILOAD = 0.5A
15V ≤ VIN ≤ 60V;
0.5A ≤ ILOAD ≤ 3A
11.52
11.40
12.54
12.66
25±10
125*
-40
* Junction temperature. Junction temperature is equal to ambient because of measurements of electric
parameters are executed in pulse mode.
8
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CBM2576HVS-3.3/5.0/12/ADJ
OPERATION INSTRUCTION
Application Information
INVERTING REGULATOR
Figure 4 shows a CBM2576-12 in a buck-boost configuration to generate a negative 12V
output from a positive input voltage. This circuit bootstraps the regulator's ground pin to the
negative output voltage, then by grounding the feedback pin, the regulator senses the inverted
output voltage and regulates it to -12V.
For an input voltage of 12V or more, the maximum available output current in this
configuration is approximately 700 mA. At lighter loads, the minimum input voltage required
drops to approximately 4.7V.
The switch currents in this buck-boost configuration are higher than in the standard
buck-mode design, thus lowering the available output current. Also, the start-up input current of
the buck-boost converter is higher than the standard buck-mode regulator, and this may
overload an input power source with a current limit less than 5A. Using a delayed turn-on or an
undervoltage lockout circuit (described in the next section) would allow the input voltage to rise
to a high enough level before the switcher would be allowed to turn on.
Because of the structural differences between the buck and the buck-boost regulator
topologies, the buck regulator design procedure section can not be used to to select the
inductor or the output capacitor. The recommended range of inductor values for the buck-boost
design is between 68µH and 220µH, and the output capacitor values must be larger than what is
normally required for buck designs. Low input voltages or high output currents require a large
value output capacitor (in the thousands of micro Farads).
The peak inductor current, which is the same as the peak switch current, can be calculated
from the following formula:
ILOAD VIN ꢆ VO
VIN|VO|
ꢅ
Ip ≈
ꢆ
×
VIN
V
IN ꢆ |VO| ꢈLꢅFOSC
Where fOSC = 52 kHz. Under normal continuous inductor current operating conditions, the
minimum VIN represents the worst case. Select an inductor that is rated for the peak current
anticipated.
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CBM2576HVS-3.3/5.0/12/ADJ
OPERATION INSTRUCTION
FIGURE 4. Inverting Buck-Boost Develops -12V
Also, the maximum voltage appearing across the regulator is the absolute sum of the input
and output voltage. For a -12V output, the maximum input voltage for the IL2576 is +28V.
NEGATIVE BOOST REGULATOR
Another variation on the buck-boost topology is the negative boost configuration. The
circuit in Figure 5 accepts an input voltage ranging from -SV to -12V and provides a regulated
-12V output. Input voltages greater than-12V will cause the output to rise above -12V, but will
not damage the regulator
Typical Load Current
400 mA for VIN= -5.2V
750 mA for VIN = -7V
Note: Heat sink may be required
FIGURE 5. Negative Boost
10
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CBM2576HVS-3.3/5.0/12/ADJ
OPERATION INSTRUCTION
Because of the boosting function of this type of regulator, the switch current is relatively
high, especially at low input voltages.
Output load current limitations are a result of the maximum current rating of the switch. Also,
boost regulators can not provide current limiting load protection in the event of a shorted load,
so some other means (such as a fuse) may be necessary.
UNDERVOLTAGE LOCKOUT
In some applications it is desirable to keep the regulator off until the input voltage reaches a
certain threshold. An undervoltage lockout circuit which accomplishes this task is shown in
Figure 6 while Figure 7 shows the same circuit applied to a buck-boost configuration. These
circuits keep the regulator off until the input voltage reaches a predetermined level.
VTH =VZ1 + 2VBE(Q1)
FIGURE 6. Undervoltage Lockout for Buck Circuit
FIGURE 7. Undervoltage Lockout for Buck-Boost Circuit
11
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OPERATION INSTRUCTION
DELAYED STARTUP
The ON /OFF pin can be used to provide a delayed startup feature as shown in Figure 8. With
an input voltage of 20V and for the part values shown, the circuit provides approximately 10 ms
of delay time before the circuit begins switching
Increasing the RC time constant can provide longer delay times. But excessively large RC
time constants can cause problems with input voltages that are high in 60Hz or 120Hz ripple, by
coupling the ripple into the ON /OFF pin.
FIGURE 8. Delayed Startup
ADJUSTABLE OUTPUT, LOW-RIPPLE POWER SUPPLY
A 3A power supply that features an adjustable output voltage is shown in Figure 9. An
additional L-C filter that reduces the output ripple by a factor of 10 or more is included in this
circuit.
FIGURE 9. Adjustable 3A Power Supply with Low Output Ripple
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OPERATION INSTRUCTION
Definition of Terms
BUCK REGULATOR
A switching regulator topology in which a higher voltage is converted to a lower voltage.
Also known as a step-down switching regulator.
BUCK-BOOST REGULATOR
A switching regulator topology in which a positive voltage is converted to a negative voltage
without a transformer.
DUTY CYCLE (D)
Ratio of the output switch's on-time to the oscillator period.
V
D = ꢋ
=
=
ON
T
OUT
for buck regulator
V
IN
|V |
O
D = ꢋ
ON
T
for buck-boost regulator
|V |ꢆV
O
IN
CATCH DIODE OR CURRENT STEERING DIODE
The diode which provides a return path for the load current when the IL2576 switch is OFF.
EFFICIENCY (η)
The proportion of input power actually delivered to the load.
POUT
PIN
POUT
η =
≈
POUT ꢆ PLOSS
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OPERATION INSTRUCTION
PACKAGE INFORMATION
TO-220-5L
DIMENSIONS IN MILLIMETERS
DIMENSIONS IN INCHES
SYMBOL
MIN
4.07
0.76
0.36
14.22
9.78
1.57
6.68
1.14
5.46
2.29
13.21
3.68
2.54
NOM
4.45
0.89
0.50
14.86
10.16
1.71
6.81
1.27
6.16
2.74
13.97
3.81
2.73
MAX
4.82
1.02
0.64
15.50
10.54
1.85
6.93
1.40
6.86
3.18
14.73
3.94
2.92
MIN
0.160
0.030
0.014
0.560
0..385
0.062
0.263
0.045
0.215
0.090
0.520
0.145
0.100
NOM
0.175
0.035
0.020
0.585
0.400
0.067
0.268
0.050
0.243
0.108
0.550
0..150
0.107
MAX
0.190
0.040
0.025
0.610
0.415
0.073
0.273
0.055
0.270
0.125
0.580
0.155
0.115
A
b
C
D
E
e
e1
F
H1
J1
L
øp
Q
14
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CBM2576HVS-3.3/5.0/12/ADJ
OPERATION INSTRUCTION
TO-263-5L
DIMENSIONS IN MILLIMETERS
MIN MAX
DIMENSIONS IN INCHES
SYMBOL
NOM
4.46
0.84
0.50
1.27
9.15
10.16
1.71
6.86
15.24
2.54
MIN
0.160
0.026
0.014
0.045
0.341
0.385
0.062
0.260
0.575
0.090
NOM
0.176
0.033
0.020
0.050
0.360
0.400
0.068
0.270
0.600
0.100
MAX
0.191
0.040
0.025
0.055
0.380
0.415
0.073
0.280
0.625
0.110
0.115
A
B
4.07
0.66
0.36
1.14
8.65
9.78
1.57
6.60
14.61
2.29
4.85
1.02
0.64
1.40
9.65
10.54
1.85
7.11
15.88
2.79
2.92
C
C2
D
E
e
F
L
L1
L2
15
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CBM2576HVS-3.3/5.0/12/ADJ
OPERATION INSTRUCTION
TO-220-5L(Bent Staggered)
DIMENSIONS IN MILLIMETERS
DIMENSIONS IN INCHES
SYMBOL
MIN
4.4
NOM
4.6
MAX
4.7
MIN
0.175
0.027
0.330
NOM
0.180
0.032
0.340
0.039
0.248
0.400
0.067
0.050
0.250
0.850
0.972
0.105
0.177
0.331
0.110
MAX
0.185
0.037
0.350
A
b
0.7
0.8
0.9
D
8.4
8.7
8.9
d1
d2
E
1.0
6.3
9.91
1.6
10.16
1.7
10.41
1.8
0.390
0.062
0.048
0.410
0.072
0.052
e
F
1.2
1.25
6.4
1.3
H1
H2
H3
J1
J2
J3
Q
20.8
23.9
21.6
24.7
2.7
22.4
25.5
0.820
0.942
0.880
1.002
3.7
2.5
4..5
8.4
5.3
3.0
0.147
0.100
0.207
0.120
2.8
16
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OPERATION INSTRUCTION
PACKAGE/ORDERING INFORMATION
ORDERING
NUMBER
TEMPRANG
E
PAKEAGE
MARKING
TRANSPOT
PRODUCT
PACKAGE
MEDIA,QUANTILY
CBM2576HVT-ADJ -40℃~125℃
CBM2576HVS-ADJ -40℃~125℃
CBM72576HVT-3.3 -40℃~125℃
CBM2576HVS-3.3 -40℃~125℃
CBM2576HVT-5.0 -40℃~125℃
CBM2576HVS-5.0 -40℃~125℃
CBM2576HVT-12 -40℃~125℃
CBM2576HVS-12 -40℃~125℃
TO-220
TO-263-5
TO-220
2576HVT-ADJ
2576HVS-ADJ
2576HVT-3.3
2576HVS-3.3
2576HVT-5.0
2576HVS-5.0
2576HVT-12
2576HVS-12
Tape and Reel,46
Tape and Reel,500
Tape and Reel,46
Tape and Reel,500
Tape and Reel,46
Tape and Reel,500
Tape and Reel,46
Tape and Reel,500
CBM2576
CBM2576-3.3
CBM2576-5
CBM2576-12
TO-263-5
TO-220
TO-263-5
TO-220
TO-263-5
17
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