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PDF ISL8216M Data sheet ( Hoja de datos )
| Número de pieza | ISL8216M | |
| Descripción | 4A DC/DC Power Module | |
| Fabricantes | Intersil | |
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Complete High Voltage 80V, 4A DC/DC Power Module
ISL8216M
The ISL8216M is a simple and easy to use, high voltage DC/DC
module and is ideal for a wide variety of applications. It
eliminates design and manufacturing risks while dramatically
improving time to market.
The simplicity is in the "Off-The-Shelf" unassisted
implementation. All you need is the ISL8216M, input and
output capacitors, and one resistor to program the output
voltage and you have a complete high voltage power design
ready for the market.
The ISL8216M is packaged in a thermally enhanced, compact
(15mm×15mm×3.6mm) over-molded High-Density Array
(HDA) Package, which permits full load operation without heat
sink or fans. The package is suitable for automated assembly
by standard surface mount equipment. The small amount of
external components reduce the PCB to a component layer
and a simple ground layer.
Related Literature
• AN1907 “ISL8216MEVAL1Z Evaluation Board User’s Guide”
Features
• Complete switch mode power supply in one package
• Wide input voltage range: 10V to 80V
• Output current 4A
• Programmable soft-start
• Compliant with EN 55022 Class B (see AN1907)
• SYNC and adjustable frequency 200kHz to 600kHz
• Single resistor sets VOUT +2.5V up to +30V
• Setpoint accuracy ±1.5%
• Programmable overcurrent protection
• RoHS compliant with exemption
• Small footprint, low profile (15mm×15mm×3.6mm)
Applications
• Servers
• 48V telecom and datacom applications
• 12V and 42V automotive and industrial equipment
• Distributed power converters and point-of-load (POL)
regulation
• General purpose step-down DC/DC
NOTE: ALL PINS NOT SHOWN ARE FLOATING
FIGURE 1. TYPICAL APPLICATION CIRCUIT
3.6mm
15mm
FIGURE 2. SMALL FOOTPRINT PACKAGE WITH LOW PROFILE (3.6mm)
May 9, 2014
FN8607.2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2014. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL8216M
Pin Descriptions
PIN PIN
NUMBER NAME TYPE
PIN DESCRIPTION
A1 SGND PWR Control signal ground. All voltage levels are measured with respect to this pin.
A3, B3 RTCT
A5 SYNC
I Frequency setting pin. This pin sets the frequency of the sawtooth oscillator. The module has a resistor and a capacitor
internally, which set the default frequency to 300kHz. Connect an external resistor to VIN and an external capacitor to SGND
to change the frequency of the sawtooth oscillator. See “Oscillator and Frequency Synchronization” on page 12. Range: 0V to
VIN.
I Signal synchronization. The switching frequency can be synchronized to an external clock through this pin. When the sync
function is not used, this pin must be tied to ground. If the sync function is used, the RTCT natural frequency must be set to a
frequency lower than the sync input frequency. See “Oscillator and Frequency Synchronization” on page 12. Range: 0V to 5V.
A7 VDD PWR Power connection for the internal controller. Tie to VIN directly. A decoupling ceramic capacitor between this pin and
signal ground (SGND) is optional.
A8
A11, F8
OCSET
PGND
I Current limit sensing pin. The current limit can be reduced by placing a resistor, ROCSET_EX, between this pin and VIN. See
“Overcurrent Protection” on page 13. Range: 0V to VIN.
PWR Power ground. These pins provides the power ground to the internal controller IC. Tie these pins to the power ground plane
through the lowest impedance connection. These pins are not internally connected to PAD5.
A12 PVCC PWR Internal linear regulator output. Typical: 11V.
A14 UGATE - Test pin. This pin must be floating. Avoid routing any trace close to this pin, as voltage on this pin can be as high as 100V.
B1, C1 FB
I Feedback pin. Output voltage is set by an external resistor between FB to SGND. Refer to Equation 1 and Table 1 on page 10.
Typical: 1.2V
C11 BOOT PWR Floating bootstrap supply pin for the MOSFET gate driver. The module has a bootstrap diode and a bootstrap capacitor
internally. This pin can be used to provide an additional current path for charging the internal bootstrap capacitor; the charging
current is derived from VIN through a resistor. See Figure 23, on page 14. Range: 0V to 92V.
D1 COMP I/O Error amplifier output. This pin is connected to the output of the transconductance error amplifier and may be used to
compensate the feedback loop. Range: 0V to 12V.
E1 PGOOD O Power good. Provides a power good status. An open drain output is asserted when the voltage at the FB pins is within ±14%
of the reference voltage. See “Power-Good” on page 14. Range: 0V to 12V.
E14 ENSS I/O Enable and soft-start pin. This pin provides enable/disable functionality and soft-start timing functionality for the PWM
output. Connect a capacitor to SGND to set the soft-start time. See “Enable/Soft-Start” on page 11. The module is disabled
when this pin is held below 0.5V. To use this pin as an enable control pin, connect to a device with open drain output, or
alternatively to an external enable control circuit, as shown in Figure 18. Range: 0V to 5V.
F1 PCOMPX I Compensation adjustment pin. Short this pin to VOUT if the output capacitors are all ceramic capacitors. Connect a lower
than 1kΩ resistor to VOUT if the output capacitors are tantalum capacitors, polymer capacitors, or aluminum electrolytic
capacitors. Range: 1.2V to 30V.
PAD1
SGND PWR Signal ground of the internal controller. All voltage levels are measured with respect to this pad. This pad is electrically
isolated. Connect this pad to the signal ground plane using multiple vias for a robust thermal conduction path.
PAD2
VIN PWR Power input pin. Apply input voltage between VIN and PGND (PAD5). It is recommended to place an input decoupling capacitor
directly between VIN pin and PGND. The input capacitor should be placed as closely as possible to the module. Range: 10V to 80V.
PAD3
VOUT
PWR Power output pin. Apply output load between VOUT and PGND (PAD5). Place a high frequency output decoupling capacitor
directly between VOUT and PGND (PAD5). The output capacitor should be placed as closely to the module as possible. Range:
1.2V to 30V.
PAD4 PHASE PWR Phase node. The PHASE pin should be floating. To achieve better thermal performance, the phase planes can also be used
for heat removal with thermal vias connected to large inner layers.
PAD5
PGND
PWR Power Ground. Power ground pins for both input and output returns. Connect to power ground plane immediately below the
module to maximize heat dissipation and to minimize the effect of switching noise and power loss due to the impedance of
the copper traces.
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5
FN8607.2
May 9, 2014
5 Page 
ISL8216M
Application Information
Programming the Output Voltage
The ISL8216M has an internal 1.192V ±1% reference voltage.
Programming the output voltage requires a resistor, RFB,
between FB and SGND. Please note that the output voltage
accuracy is also dependent on the resistance accuracy. The
customer should select a high accuracy resistor (i.e. 0.5%) in
order to achieve the overall output accuracy. The output voltage
can be calculated as shown in Equation 1.
VOUT
=
1
+
-1---1-R--.--3F----kB------
1.192V
(EQ. 1)
The value of RFB for selecting different typical output voltages is
shown in Table 1.
TABLE 1. VALUE OF RFB FOR DIFFERENT OUTPUT VOLTAGES
RFB TYPICAL VOUT
(Ω) (V)
3.48k
5
1.24k
12
715 20
590 24
464 30
Enable/Soft-Start
5V
4V
VOUT
ENSS
3V
2V
1V POR
2.6V
1.4V
0.7V
the IC starts switching (t2) can be approximated by using
Equation 2:
tdelay switching = 3.712 105 CSS
(EQ. 2)
The output voltage soft-start time is determined by the rise time
of ENSS voltage from 1.4V to 2.6V (t3 - t2). The output voltage
ramp time can be calculated from:
tSS
=
-------1----.-2---------
33 10–6
CSS
(EQ. 3)
The soft-start capacitor CSS is continuously charged up linearly
and clamped at 5V. Note that any leakage current on the ENSS
node will extend the start-up period. Figure 17 shows the typical
soft-start waveforms.
RRT/CCTT
EENNSSSS
VVOOUUTT
PPHHAASSEE
FIGURE 17. TYPICAL SOFT-START WAVEFORM
The module can be enabled by an external signal by using an
open-drain output device, or by adding an external circuit, as
shown in Figure 18. For such circuit, a bias voltage of
approximately 5.1V is recommended, which can be generated
from VIN simply through a resistor in series with a zener diode
that has a nominal working voltage of 5.1V. When the external
control signal is low, ENSS is pulled to ground. When the external
control signal is high, ENSS is released to allow the soft-start
function.
T0 T1 T2 T3
FIGURE 16. TYPICAL SOFT-START DIAGRAM
Figure 16 illustrates the start-up scheme of the ISL8216M. The
Power-On Reset (POR) function continually monitors the bias
voltage at VDD and VIN. When the voltage at VDD and VIN exceed
their rising POR thresholds (T0), the ISL8216M initially provides
2μA to charge the soft-start capacitor, CSS, connected to the
ENSS pin. If the voltage at this pin is allowed to rise, it will
ramp-up with at a slope determined by the 2μA current and the
value of the soft-start capacitor. When the voltage at ENSS
reaches 0.77V (Typ) at T1, the oscillator circuit is active, causing
the voltage at the RTCT pin to drop from VIN and generate a
sawtooth waveform. At the same time, the soft-start current is
increased to 33μA; as a result, the ENSS voltage then ramps up
at a faster rate. The UGATE starts switching when the ENSS
voltage reaches 1.4V (Typ). The delay from POR (t0) to the time
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FIGURE 18. EXTERNAL ENABLE CIRCUIT
FN8607.2
May 9, 2014
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet ISL8216M.PDF ] | |
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