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參數資料
| 型號： | CS9203-CL |
| 英文描述： | Sound Generator Circuit |
| 中文描述： | 聲音發(fā)生器電路 |
| 文件頁數： | 4/8頁 |
| 文件大?。?/td> | 66K |
| 代理商： | CS9203-CL |
CS9202
http://onsemi.com
4
CIRCUIT DESCRIPTION
VOLTAGE REFERENCE AND OUTPUT
CIRCUITRY
Output Stage Protection
The output stage is protected against overvoltage, short
circuit and thermal runaway conditions (Figure 7).
If the input voltage rises above 32 V (typ), the output shuts
down. This response protects the internal circuitry and
enables the IC to survive unexpected voltage transients.
Should the junction temperature of the power device
exceed 180
°
C
(typ) the power transistor is turned off.
Thermal shutdown is an effective means to prevent die
overheating since the power transistor is the principle heat
source in the IC.
Figure 7. Typical Circuit Waveforms for Output
Stage Protection
Load
Dump
Short
Circuit
Thermal
Shutdown
V
IN
V
OUT
I
OUT
> 32 V
APPLICATION & TEST DIAGRAM
GND
V
IN
V
OUT
CS9202
C
1
*
0.1
μ
F
* C1 is required if regulator is distant from power source filter.
APPLICATION NOTES
STABILITY CONSIDERATIONS / NOCAP
Normally a low dropout or quasi–low dropout regulator
(or any type requiring a slow lateral PNP in the control loop)
necessitates a large external compensation capacitor at the
output of the IC. The external capacitor is also used to curtail
offshoot, determine startup delay time and load transient
response.
Traditional LDO regulators typically have low unity gain
bandwidth, display overshoot and poor ripple rejection.
Compensation is also an issue and depends on the external
capacitor value, ESR (Equivalent Series Resistance) and
board layout parasitics that all can create oscillations if not
properly accounted for.
NOCAP is an ON Semiconductor exclusive output stage
which internally compensates the LDO regulator over
temperature, load and line variations without the need for an
expensive external capacitor
NOCAP is ideally suited for slow switching or steady
loads. If the load is characterized by transient current events,
an output storage capacitor may be needed. If this is the case,
the capacitor should be no larger than 100 nF. With loads
that require greater transient suppression, a regulator with a
traditional output stage (such as the CS8221) may be better
suited for proper operation.
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