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RT9553A Scheda tecnica(PDF) 9 Page - Richtek Technology Corporation

Il numero della parte RT9553A
Spiegazioni elettronici  High Accuracy Current/Voltage Sensing and Protection IC
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Produttore elettronici  RICHTEK [Richtek Technology Corporation]
Homepage  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9553A Scheda tecnica(HTML) 9 Page - Richtek Technology Corporation

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RT9553A
9
DS9553A-00
September 2014
www.richtek.com
©
Copyright
2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
OVSET
CSP
R2
V3.3V
R1 R2
R2
V3.3V
9
R1 R2


We suggest that the total resistance of divider network
should be higher than 100k
Ω.
VCSP is over-voltage protection trigger point.
Fighre1.Setting Network of Over-Voltage Protection and
Under-Voltage Protection
UVSET
OVSET
+
-
+
-
1R
8R
TIMER
RTIMER
R1
R2
R3
R4
3.3V
3.3V
CSP
VCSP
Under-Voltage Protection (UVP)
The principle of under-voltage protection is the same as
over-voltage protection function. The under-voltage
protection threshold is set by the UVSET pin.
When the CSP pin voltage is lower the setting threshold
at the UVSET pin, the under-voltage protection will be
triggered, and the RESET pin will be pull low after a deglitch
time, the RESET is resumed when the CSP pin voltage
up to 8% hysteresis.
Over-Current Protection (OCP)
As an industry standard, high accuracy current sense
amplifier is used to monitor the input current that flows
through current sense resistor. The RT9553A detects CSP-
CSN differential voltage across the current sense resistor
to monitor input current. The equation of over-current
protection is shown as below :
ILIM
SENSE
SENSE
ILIM
ILIM
SENSE
SENSE
R6
V3.3V
R5 R6
(I
R
) 20
V
V
I
20 R


We suggest that the total resistance of divider network
should be higher than 100k
Ω.
ISENSE is over-current protection trigger point.
The 20 is amplification of internal error amplifier.
Figure 2. Setting Network of Over-Current Protection
CSN
CSP
ILIM
3.3V
R5
R6
ISENSE
RSENSE
Application Information
The RT9553A provides OVP, UVP, OCP protection
functions with RESET, PROCHOT indicator to inform
system. It can be operated minimize external components
of switching power supply systems to achieve protection.
For easily using and increasing PCB space utilization,
the RT9553A is used in notebook applications.
Over-Voltage Protection (OVP)
The CSP pin voltage can be continuously monitored for
over-voltage condition.
When the CSP pin voltage exceeds the setting threshold
at the OVSET pin, the over-voltage protection will be
triggered, and the RESET pin will be pull low after a deglitch
time, the RESET is resumed when the CSP pin voltage
down to 8% hysteresis.
For more details, please refer to the following information.
The equation of over-voltage setting threshold is shown
as below :


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