参数资料
| 型号： | ISL62873HRUZ-T |
| 厂商： | Intersil |
| 文件页数： | 10/17页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16UTQFN |
| 标准包装： | 3,000 |
| 系列： | Robust Ripple Regulator™ (R³) |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 电源电压： | 3.3 V ~ 25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -10°C ~ 100°C |
| 封装/外壳： | 16-UFQFN |
| 包装： | 带卷 (TR) |
ISL62873
t VS = ( R T ? C SOFT ) ? LN ( 1 – ------------------------------------------- )
( V NEW – V OLD )
? R
I
V O
I L
_
R OCSET
reference, programs a different setpoint reference voltage,
the I VS current source charges or discharges capacitor
C SOFT to that new level at ±100μA. Once C SOFT charges to
the selected setpoint voltage, the I VS current source comes
out of the 100μA current limit and decays to the static value
set by V SREF ÷ R T . The elapsed time to charge C SOFT to
the new voltage is called the voltage-step delay t VS and is
given by Equation 11:
(EQ. 11)
VS T
pin and the actual output voltage of the converter. During
normal operation, the VO pin is a high impedance path,
therefore there is no voltage drop across R O . The value of
resistor R O should always match the value of resistor
R OCSET .
L
DCR
PHASE
+ V DCR
C SEN
C O
Where:
- I VS is the ±100μA setpoint voltage-step current
- V NEW is the new setpoint voltage selected by the VID
inputs
10μA
OCSET
VO
+ V ROCSET
R O
_
– t SS
C SOFT = ---------------------------------------------------------------------
? R T ? LN ( 1 – ------------------------------ ) ?
V DCR = I L ? DCR
- V OLD is the setpoint voltage that V NEW is changing
from
- R T is the sum of the R SET programming resistors
Component Selection for C SOFT Capacitor
Choosing the C SOFT capacitor to meet the requirements of a
particular soft-start delay t SS is calculated with Equation 12,
which is written as:
(EQ. 12)
? V START-UP ?
? I SS ? R T ?
Where:
FIGURE 6. OVERCURRENT PROGRAMMING CIRCUIT
Figure 6 shows the overcurrent set circuit. The inductor
consists of inductance L and the DC resistance DCR. The
inductor DC current I L creates a voltage drop across DCR,
which is given by Equation 14:
(EQ. 14)
The I OCSET current source sinks 10μA into the OCSET pin,
creating a DC voltage drop across the resistor R OCSET ,
which is given by Equation 15:
V ROCSET = 10 μ A ? R OCSET (EQ. 15)
-
t SS is the soft-start delay
-
I SS is the soft-start current source at the 20μA limit
The DC voltage difference between the OCSET pin and the
– t VS
C SOFT = ------------------------------------------------------------------------------
? R T ? LN ( 1 – --------------------------------------- ) ?
- V START-UP is the setpoint reference voltage selected by
the state of the VID inputs at the time EN is asserted
- R T is the sum of the R SET programming resistors
Choosing the C SOFT capacitor to meet the requirements of a
particular voltage-step delay t VS is calculated with
Equation 13, which is written as:
(EQ. 13)
? V NEW – V OLD ?
? ± I VS ? R T ?
Where:
VO pin, which is given by Equation 16:
V OCSET – V VO = V DCR – V ROCSET = I L ? DCR – I OCSET ? R OCSET
(EQ. 16)
The IC monitors the voltage of the OCSET pin and the VO
pin. When the voltage of the OCSET pin is higher than the
voltage of the VO pin for more than 10μs, an OCP fault
latches the converter off.
Component Selection for R OCSET and C SEN
The value of R OCSET is calculated with Equation 17, which
is written as:
I OCSET
-
-
-
t VS is the voltage-step delay
V NEW is the new setpoint voltage
V OLD is the setpoint voltage that V NEW is changing
from
I OC ? DCR
R OCSET = ----------------------------
Where:
(EQ. 17)
- I VS is the ±100μA setpoint voltage-step current; positive
when V NEW > V OLD , negative when V NEW < V OLD
- R T is the sum of the R SET programming resistors
Fault Protection
Overcurrent
The overcurrent protection (OCP) setpoint is programmed
with resistor R OCSET which is connected across the OCSET
and PHASE pins. Resistor R O is connected between the VO
10
- R OCSET ( Ω ) is the resistor used to program the
overcurrent setpoint
- I OC is the output DC load current that will activate the
OCP fault detection circuit
- DCR is the inductor DC resistance
For example, if I OC is 20A and DCR is 4.5m Ω , the choice of
R OCSET is = 20A x 4.5m Ω /10μA = 9k Ω.
Resistor R OCSET and capacitor C SEN form an R-C network
to sense the inductor current. To sense the inductor current
FN6930.1
August 31, 2010
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