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PDF MAX8515 Data sheet ( Hoja de datos )
| Número de pieza | MAX8515 | |
| Descripción | Wide-Input 0.6V Shunt Regulators | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX8515 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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19-2528; Rev 1; 2/03
EVAALVUAAILTAIOBNLEKIT
www.DataShee
Wide-Input 0.6V Shunt Regulators for
Isolated DC-to-DC Converters
General Description
The MAX8515A/MAX8515 shunt regulators simplify the
design of voltage regulation and overvoltage protection
(OVP) functions in high-accuracy isolated DC-to-DC con-
verters with output voltages as low as 0.6V. The devices
have supply voltage and feedback inputs separated from
the output shunt stage, and can operate directly from the
DC-to-DC converter output stage when the output voltage
is 1.8V to 18V. Alternately, the MAX8515A/MAX8515 input
stage can be biased from an unregulated 1.7V to 28V
supply, independent of DC-to-DC converter output volt-
age. The MAX8515A/MAX8515 shunts 20mA when the
output voltage is as low as 0.2V.
The MAX8515A features an initial output accuracy of
0.5% at +25°C and 1% from -40°C to +85°C and provides
the output voltage regulation function for isolated DC-to-
DC converters. The MAX8515 features initial output
accuracy of 1% at +25°C and 1.8% from -40°C to +85°C
and can provide an output OVP function for isolated DC-
to-DC converters. High open-loop bandwidth allows
design of high-bandwidth DC-to-DC converters.
Low-cost, low-dropout linear regulators can be designed
with the MAX8515A/MAX8515 and an external NPN tran-
sistor for cost-conscious applications that do not require
overcurrent, short-circuit, or overtemperature protection.
The MAX8515/MAX8515A are available in space-saving
5-pin SC70 and SOT23 packages and are specified over
the -40°C to +85°C extended temperature range. An eval-
uation kit is available to speed designs.
Applications
Isolated DC-to-DC Converters
Network, Telecom, and Cellular Base Station
Power Supplies
Low-Dropout Linear Regulators
Shunt Regulator
Adjustable Voltage Reference
Pin Configuration
TOP VIEW
PGND 1
5 FB
MAX8515A
GND 2 MAX8515
OUT 3
4 IN
-PIN SC7
mm x 2.1
SC7O/THIN SOT23
Features
o MAX8515A
0.6V ±0.5% Initial Accuracy at +25°C
0.6V ±1% Accuracy from -40°C to +85°C
o MAX8515
0.6V ±1% Initial Accuracy at +25°C
0.6V ±1.8% Accuracy from -40°C to +85°C
o Sinks 20mA at 0.2V to 18V
o Input Voltage Range from 1.7V to 28V
o Directly Drives Optocouplers
o 0.2Ω Dynamic Output Impedance
o Space-Saving 5-Pin SC70 or SOT23 Packages
PART
MAX8515AEXK-T
MAX8515AEZK-T
MAX8515EXK-T
MAX8515EZK-T
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
5 SC70-5
5 Thin SOT23-5
5 SC70-5
5 Thin SOT23-5
Functional Diagram appears at end of data sheet.
Selector Guide appears at end of data sheet.
Typical Operating Circuit
INPUT SUPPLY INPUT
1.7V TO 28V 1.7V TO 18V
IN OUT
MAX8515A
MAX8515
PGND
GND
FB
PRIMARY SIDE
PWM CONVERTER
CONTROL
VOLTAGE
ISOLATED DC-DC
CONVERTER
OUTPUT
(DOWN TO 0.6V)
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
www.DataSheet4U.com
Wide-Input 0.6V Shunt Regulators for
Isolated DC-to-DC Converters
VIN
1.8V
R3
C1
0.1µF
IN OUT
MAX8515A
MAX8515
PGND
GND
FB
VOUT
0.6V/20mA
R1 = SHORT
R2 = OPEN
C2
1.0µF
R1
VIN (V) R3 (Ω)
3.3 135
10 470
R2 28 1.33k
Figure 1. MAX8515A/MAX8515 Typical Application Circuit,
Shunt Regulator/Adjustable Voltage Reference
Optical Feedback
Setting VOUT
Figure 3 displays an application circuit using the
MAX8515A/MAX8515 in an opto-isolated feedback cir-
cuit. The maximum bias current for the photodiode is
set with R1. The isolated DC-to-DC converter compen-
sation circuit is formed with R2, C3, and C4. Resistors
R3 and R4 set the isolated DC-to-DC converter output
voltage. C1 decouples the input supply and C2 is
needed to stabilize the MAX8515A/MAX8515. Calculate
VREG with the following equation:
VREG = 0.6 ×
1 +
R3
R4
Set R4 to 10kΩ and calculate R3 by:
R3
=
VOUT
VFB
- 1
×
R4
For example, given a regulator output voltage of 1.8V
and R4 = 10kΩ, R3 is found to be 20kΩ.
Compensation Circuit
A typical compensation scheme is depicted in Figure 3.
C3 provides an integrator function that minimizes out-
put regulation error.
R2 provides additional phase compensation at the zero
frequency fz:
fZ
=
2π
×
1
R2
×
C3
5.6V
3.3V
VOUT = 0.6V
TEST CIRCUIT
0.1µF
IN OUT
MAX8515A
MAX8515
PGND
GND
FB
GAIN = TEST/REFERENCE
1kΩ
TEST
2.2nF
1MΩ
0.82µF
50kΩ
2.2nF
REFERENCE
1MΩ
NETWORK
ANALYZER
SOURCE
11V
3.3V
VOUT = 6V
TEST CIRCUIT
115kΩ
1%
TEST
2.2nF
1MΩ
160kΩ
0.1µF
IN OUT
MAX8515A
MAX8515
PGND
GND
FB
10kΩ
1%
GAIN = TEST/REFERENCE
0.1µF
50kΩ
90.1kΩ
1%
2.2nF
NETWORK
ANALYZER
SOURCE
REFERENCE
1MΩ
Figure 2. Test Circuits for Gain and Phase Plots
The midband gain is given by:
A = R2
R3
Add C4 for high-frequency noise rejection. Determine
R2 based on the midband gain required by the isolated
power supply. Choose fz based on the power supply
small-signal transfer function. Calculate C3 once fz
is known.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MAX8515.PDF ] | |
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