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FSB50550A データシート(PDF) 11 Page - Fairchild Semiconductor

部品番号 FSB50550A
部品情報  Motion SPM 5 Series Version 2 User?셲 Guide
Download  28 Pages
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メーカー  FAIRCHILD [Fairchild Semiconductor]
ホームページ  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FSB50550A データシート(HTML) 11 Page - Fairchild Semiconductor

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AN-9080
APPLICATION NOTE
© 2013 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1 • 4/16/14
11
4.
Integrated Functions and Protection Circuit
4.1. Internal Structure of HVIC
Common Mode
Noise Canceller
Level-Shift
Circuit
HIN
500k
(typ)
HVIC of Motion SPM
® 5 Series Version 2 Products
500k
(typ)
LIN
Input
Noise
Filter
Input
Noise
Filter
90ns(typ)
Gate Driver w/
Gate Resistors
Gate Driver w/
Gate Resistors
Matching
Delay
HO
LO
Figure 13. Internal Block Diagram of HVIC
Figure 13 shows the block diagram of the internal structure
of the HVIC inside Motion SPM 5 Series V2 products. Gate
signal input pins have internal 500 kΩ (typical) pull-down
resistors. The weak pull-down reduces standby power
consumption. If there is any concern for malfunction due to
noise associated with layout, additional pull-down resistors
of 4.7 kΩ, for example, are recommended close to the
module input pins. RC filters can be used instead of pull-
downs to reduce noise and narrow pulses as well. Keep in
mind that this filter introduces some distortion of PWM
volt-second because the ON/OFF threshold levels are not
symmetrical within the supplied voltage.
4.2. Circuit of Input Signal (VIN(H), VIN(L))
Figure 14 shows an example of PWM input interface circuit
from the microcontroller (MCU) to Motion SPM 5 Series
products. The input logic is active HIGH and, because there
are built-in pull-down resistors of 500 kΩ, external pull-
down resistors are not typically needed.
MCU
SPM
IN(UH), IN(VH), IN(WH)
IN(UL), IN(VL), IN(WL)
COM
RF
CF
RPD
Figure 14. Recommended MCU I/O Interface Circuit
The maximum rating voltages of the input pins are shown in
Table 4. The RC coupling at each input shown dotted in
Figure 14 may change depending on the PWM control
scheme used in the application and the wiring impedance of
the application PCB layout.
Table 4. Maximum Ratings of Input Pins
Item
Symbol
Condition
Rating (V)
Control Supply
Voltage
VCC
Applied between
VCC – COM
20
Input Signal
Voltage
VIN
Applied between
IN(xH) – COM,
IN(xL) – COM
-0.3 ~ VCC + 0.3
Motion SPM 5 Series products employ active-HIGH input
logic. This removes the sequence restriction between the
control supply and the input signal during power supply
startup or shutdown. In addition, pull-down resistors are
built into each input circuit. Therefore, external pull-down
resistors are not typically needed and the number of external
components is smaller as a result. The input noise filter
inside the HVIC suppresses short pulse noise and prevents
the MOSFET from malfunction and excessive switching
loss. Furthermore, by lowering the turn-on and turn-off
threshold voltages of the input signal, as shown in Table 5, a
direct connection to 3.3 V-class MCU or DSP is possible.
Table 5. Input Threshold Voltage Ratings
(at VCC=15 V, TJ=25
°C)
Item
Symbol
Condition
Min.
Max.
On Threshold
Voltage
VIH
IN(UH), IN(VH),
IN(WH) – COM
IN(UL), IN(VL),
IN(WL) - COM
2.9 V
Off Threshold
Voltage
VIL
0.8 V
As shown in Figure 13, the input signal integrates a 500 kΩ
(typical) pull-down resistor. Therefore, when using an
external filtering resistor between the MCU output and the
Motion SPM
® input, attention should be paid to the signal
voltage drop at the input terminals to satisfy the turn-on
threshold voltage requirement. For instance, R=100 Ω and
C=1 nF can be used for the parts shown dotted in Figure 14.
4.3. Functions vs. Control Supply Voltage
Control and gate drive power for SPM 5 Series V2 products
is normally provided by a single 15 V DC supply connected
to the module VCC and COM terminals. For proper
operation, this voltage should be regulated to 15 V 10%
and its current supply should be larger than 260 µA for SPM
product, excluding other circuitry. Table 6 describes the
behavior of the SPM parts for various control supply
voltages. The control supply should be well filtered with a
low impedance electrolytic capacitor and a high-frequency
decoupling capacitor connected right at the pins.
High-frequency noise on the supply might cause the internal
control IC to malfunction and generate erroneous signals.
To avoid these problems, the maximum ripple on the supply
should be less than ±1 V/µs. In addition, it may be
necessary to connect a 20 V/1 W Zener diode (for example,
1N4747A) across the control supply to prevent surge
destruction under severe conditions.
It is very important that all control circuits and power
supplies should be referred to COM terminal of the module
and not to the N power terminal. In general, it is best
practice to make the common reference (COM) a ground
plane in the PCB layout. The main control power supply is
also connected to the bootstrap circuits that are used to
establish the floating supplies for the high-side gate drives.
When control supply voltage (VCC and VBS) falls below
Under-Voltage Lockout (UVLO) level, HVIC turns off the
MOSFETs while disregarding gate control input signals.


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