參數(shù)資料
型號(hào)： MIC502BN
廠商： MICREL INC
元件分類： 運(yùn)動(dòng)控制電子
英文描述： Replaced by PTN78060W,PTN78060H :
中文描述： BRUSHLESS DC MOTOR CONTROLLER, 0.025 A, PDIP8
封裝： PLASTIC, DIP-8
文件頁(yè)數(shù)： 8/11頁(yè)
文件大?。?/td> 130K
代理商： MIC502BN
MIC502
Micrel
MIC502
170
May 1999
Normal Operation
Normal operation consists of the PWM operating to control
the speed of the fan according to V
T1
and V
T2
. Exceptions to
this otherwise indefinite behavior can be caused by any of
three conditions: V
T1
exceeding V
OT
, an overtemperature
condition; V
T1
being pulled below V
IL
initiating a device
shutdown and reset; or both V
T1
and V
T2
falling below V
SLP
,
activating sleep mode. Each of these exceptions is treated as
follows:
Overtemp
V
T1
> V
OT
NORMAL
OPERATION
V
and V
T2
< V
SLEEP
NO
OUT Duty Cycle
Proportional to
Greater of V
T1
, V
T2
YES
Assert /OTF while
V
T1
> V
OT
Reset
V
T1
< V
IL
POWER ON
SLEEP
YES
NO
YES
NO
Figure 4. Normal System Behavior
Overtemperature: If the system temperature rises
typically 7% above the 100% duty-cycle operating point,
/OTF will be activated to indicate an overtemperature
fault. (V
T1
> V
OT
) Overtemperature detection is essen-
tially independent of other operations—the PWM
continues its normal behavior; with V
T1
> V
PWM(max)
, the
output duty-cycle will be 100%. If V
T1
falls below V
OT
,
the overtemperature condition is cleared and /OTF is no
longer asserted. It is assumed that in most systems, the
/OTF output will initiate power supply shutdown.
Shutdown/Reset: If V
T1
is driven below V
IL
an immedi-
ate, asynchronous shutdown occurs. While in shutdown
mode, OUT is off (low), and /OTF is unconditionally
inactive (high/floating). If V
T1
subsequently rises above
V
IH
, a device reset will occur. Reset is indistinguishable
from a power-up condition. The state of /OTF is cleared,
a startup interval is triggered, and normal fan operation
begins.
Sleep: If V
T1
and V
T2
fall below V
SLP
, the device enters
sleep mode. All internal functions cease unless V
T1
or
V
T2
rise above V
WAKE
. (V
WAKE
= V
SLP
+ V
HYST
.) The
/OTF output is unconditionally inactive (high/floating)
and the PWM is disabled during sleep. (OUT will float.)
Sleep Mode
During normal operation, if V
T1
and V
T2
fall below V
SLP
, the
device will go into sleep mode and fan operation will stop. The
MIC502 will exit sleep mode when V
T1
or V
T2
rise above V
SLP
by the hysteresis voltage, V
HYST
. When this occurs, normal
operation will resume. The resumption of normal operation
upon exiting sleep is indistinguishable from a power-on reset.
(See “Sleep: Normal Operation,” above.)
Disable PWM
Reset Released
V
T1
> V
IH
SLEEP
Reset Initiated
V
T1
< V
IL
YES
YES
W or V
V
T1
T2
>
V
SLP
+V
HYST
YES
POWER ON
NO
NO
NO
Figure 5. Sleep-Mode Behavior
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