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參數(shù)資料
| 型號： | LTC4213IDDB#TRMPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CIRC BREAK ELEC 8-DFN |
| 標(biāo)準包裝： | 1 |
| 系列： | * |
| 其它名稱： | LTC4213IDDB#TRMPBFDKR |
LTC4213
10
4213f
APPLICATIO S I FOR ATIO
WU
U
Figure 1 shows an electronic circuit breaker (ECB) appli-
cation. An external auxiliary supply biases the VCC pin and
the internal circuitry. A VIN load supply powers the load via
an external MOSFET. The SENSEP and SENSEN pins
OPERATIO
U
Overview
The LTC4213 is an Electronic Circuit Breaker (ECB) that
senses load current with the the RDSON of the external
MOSFET instead of using an external sense resistor. This
no RSENSE method is less precise than RSENSE method due
to the variation of RDSON. However, the advantages are
less complex, lower cost and reduce voltage and power
loss in the switch path owing to the absence of a sense
resistor. Without the external sense resistor voltage drop,
the VOUT improvement can be quite significant especially
in the low voltage applications. The LTC4213 is designed
to operate over a bias supply range from 2.3V to 6V. When
bias supply voltage and the ON pin are sufficiently high, the
GATE pin starts charging after an internal debounce delay
of 60s. During the GATE ramp-up, the circuit breaker is
not armed until the external MOSFET is fully turned on.
Once the circuit breaker is armed, the LTC4213 monitors
the load current through the RDSON oftheexternalMOSFET.
Circuit Breaker Function
The LTC4213 provides dual level and dual response time
circuit breaker functions for overcurrent protection.
The LTC4213 circuit breaker function block consists of
two comparators, SLOWCOMP and FASTCOMP. The
thresholds of SLOWCOMP and FASTCOMP are VCB and
VCB(FAST). The ISEL pin selects one of the three settings:
1. VCB = 25mV and VCB(FAST) = 100mV with ISEL at GND
2. VCB = 50mV and VCB(FAST) = 175mV with ISEL floating
3. VCB = 100mV and VCB(FAST) = 325mV with ISEL at VCC
ISEL can be stepped dynamically, such as to allow a higher
circuit breaker threshold at startup and a lower threshold
after supply current has settled. The inputs of the com-
parators are SENSEP and SENSEN pins. The voltage
across the drain and source of the external MOSFET is
sensed at SENSEP and SENSEN.
VV
V
SENSE
SENSEP
SENSEN
=
()
1
When VSENSE exceeds the VCB threshold but is less than
VCB(FAST), the comparator SLOWCOMP trips the circuit
breaker after a 16s delay. If VSENSE is greater than
VCB(FAST), the comparator FASTCOMP trips the circuit
breaker in 1s.
A severe short circuit condition can cause the load supply
to dip substantially. This does not pose a problem for the
LTC4213 as the input stages of the current limit compara-
tors are common mode to ground.
sense the load current at the drain and source of the
external MOSFET. In ECB applications, large input bypass
capacitors are usually recommended for good transient
performance.
Undervoltage Lockout
An internal undervoltage lockout (UVLO) circuit resets the
LTC4213 if the VCC supply is too low for normal operation.
The UVLO comparator (UVCOMP) has a low-to-high thresh-
old of 2.07V and 100mV of hysteresis. UVLO shares the
glitch filters for both low-to-high transition (startup) and
high-to-low transition (reset) with the ON pin compara-
tors. Above 2.07V bias supply voltage, the LTC4213 starts
if the ON pin conditions are met. Short, shallow bus bias
4213 F01
+
LTC4213
VCC
ON
READY
C1
0.1F
CLOAD
100F
R4
10k
ISEL
GND
GATE
Q1
SI4864DY
VCC
VOUT
1.25V
3.5A
SENSEN
SENSEP
VBIAS
2.5V
VIN
1.25V
+
CIN
100F
OFF ON
Figure 1. LTC4213 Electronic Circuit Breaker Application
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