MC34920FN(2004) Просмотр технического описания (PDF) - Freescale Semiconductor
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MC34920FN Datasheet PDF : 28 Pages
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Freescale Semiconductor, Inc.
Environmental Specifications
Ambient Temperature and Relative Humidity
Table 9 lists the temperature and relative humidity for
operating and storage conditions for the 34920.
Table 9. Ambient Temperature and Humidity
Condition
Temperature (°C) % Relative Humidity
Operating
0 to 70
8.0 to 80
Storage
-40 to 150
5.0 to 80
ESD Immunity
Refer to the Maximum Ratings table, page 5.
Overtemperature Protection
The 34920 implements overtemperature detection and
shutdown functions. The overtemperature circuitry monitors the
device’s internal temperature and activates thermal shutdown
circuitry when the temperature exceeds TJ(SHUTDOWN) (155°C
minimum, 175°C maximum). The thermal shutdown condition is
maintained until the die temperature falls below TJ(ENABLE)
(135°C minimum, 155°C maximum). Each voltage regulator
and motor driver circuit has its own individual shutdown circuit.
APPLICATIONS
Logic Voltage (VCC) and Reset Interoperability
The 3.3 V or 5.0 V VV1 output voltage should feed back to the
VCC input terminal directly (see Figure 7) to ensure that the
34920 can be properly reset during a power-down situation. If
this typology is not the one implemented, the user needs to be
aware that the VCC terminal is not monitored for undervoltage.
Only the V1_FB and VB+ terminals are monitored for
undervoltage. Thus, it is possible for VCC to be under voltage
without the 34920 issuing a reset.
VVB+ (21 V to 42 V)
VB+
34920
VCC
Oscillator
ENABLE
Oscillator
V1 Regulator
VB+
V2 Regulator
Vb Generator
V1_SWITCH
VV1
V1_FB
V2_SWITCH
VV2
V2_FB
VVB+ (21 V to 42 V)
Vb 22 µF 25 V
CP1
10 nF 50 V
CP2
Figure 7. Voltage Regulator Functions
MOTOROLA ANALOG INTEGRATED CIRFCoUrITMDEoVrIeCEIDnAfoTArmation On This Product,
Go to: www.freescale.com
34920
25
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