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参数资料
| 型号： | ISL9104AIRUFEVAL1Z |
| 厂商： | Intersil |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD 1 FOR ISL9104AIRUF |
| 标准包装： | 1 |
| 系列： | * |
ISL9104, ISL9104A
? R 1 ?
V O = V FB ? ? 1 + ------- ?
Overcurrent Protection
The overcurrent protection is provided on ISL9104, ISL9104A when
overload condition happens. It is realized by monitoring the CSA
When the current at P-Channel MOSFET is sensed to reach the
current limit, the OCP comparator is trigged to turn off the
P-Channel MOSFET immediately.
Short-Circuit Protection
ISL9104, ISL9104A has a Short-Circuit Protection (SCP)
comparator, which monitors the FB pin voltage for output short-
circuit protection. When the output voltage is sensed to be lower
than a certain threshold, the SCP comparator reduces the PWM
oscillator frequency to a much lower frequency to protect the IC
from being damaged.
Undervoltage Lockout (UVLO)
When the input voltage is below the Undervoltage Lock Out
(UVLO) threshold, ISL9104, ISL9104A is disabled.
Soft-Start
The soft-start feature eliminates the in-rush current during the circuit
start-up. The soft-start block outputs a ramp reference to both the
voltage loop and the current loop. The two ramps limit the inductor
current rising speed as well as the output voltage speed so that the
output voltage rises in a controlled fashion.
Low Dropout Operation
The ISL9104, ISL9104A features low dropout operation to maximize
the battery life. When the input voltage drops to a level that
ISL9104, ISL9104A can no longer operate under switching
regulation to maintain the output voltage, the P-Channel MOSFET is
completely turned on (100% duty cycle). The dropout voltage under
such condition is the product of the load current and the
ON-resistance of the P-Channel MOSFET. Minimum required input
voltage V IN under this condition is the sum of output voltage plus the
voltage drop cross the inductor and the P-Channel MOSFET switch.
Thermal Shut Down
The ISL9104, ISL9104A provides built-in thermal protection
function. The thermal shutdown threshold temperature is
+130°C (typ) with a 30°C (typ) hysteresis. When the internal
temperature is sensed to reach +130°C, the regulator is
completely shut down and as the temperature drops to +100°C
(typ), the ISL9104, ISL9104A resumes operation starting from
the soft-start.
Applications Information
Inductor and Output Capacitor Selection
To achieve better steady state and transient response, ISL9104,
ISL9104A typically uses a 1.0μH inductor. The peak-to-peak
inductor current ripple can be expressed in Equation 1:
In Equation 1, usually the typical values can be used but to have
a more conservative estimation, the inductance should consider
the value with worst case tolerance; and for switching frequency
f S , the minimum f S from the “Electrical Specifications” table on
To select the inductor, its saturation current rating should be at
least higher than the sum of the maximum output current and
half of the delta calculated from Equation 1. Another more
conservative approach is to select the inductor with the current
rating higher than the P-Channel MOSFET peak current limit.
Another consideration is the inductor DC resistance since it
directly affects the efficiency of the converter. Ideally, the
inductor with the lower DC resistance should be considered to
achieve higher efficiency.
Inductor specifications could be different from different
manufacturers so please check with each manufacturer if
additional information is needed.
For the output capacitor, a ceramic capacitor can be used
because of the low ESR values, which helps to minimize the
output voltage ripple. A typical value of 4.7μF/6.3V ceramic
capacitor should be enough for most of the applications and the
capacitor should be X5R or X7R.
Input Capacitor Selection
The main function for the input capacitor is to provide decoupling
of the parasitic inductance and to provide filtering function to
prevent the switching current from flowing back to the battery rail.
A 4.7μF/6.3V ceramic capacitor (X5R or X7R) is a good starting
point for the input capacitor selection.
Output Voltage Setting Resistor Selection
For ISL9104, ISL9104A adjustable output option, the voltage
resistors, R 1 and R 2 , as shown in Figure 2, set the desired output
voltage values. The output voltage can be calculated using
Equation 2:
(EQ. 2)
? R 2 ?
where V FB is the feedback voltage (typically it is 0.8V). The
current flowing through the voltage divider resistors can be
calculated as V O /(R 1 + R 2 ), so larger resistance is desirable to
minimize this current. On the other hand, the FB pin has leakage
current that will cause error in the output voltage setting. The
leakage current has a typical value of 0.1μA. To minimize the
accuracy impact on the output voltage, select the R 2 no larger
than 200k Ω .
is highly recommended for improving stability and achieving
better transient response.
Table 1 provides the recommended component values for some
output voltage options.
V O ? ? 1 – -------- ?
L ? f S
? V O ?
? V IN ?
Δ I = ------------------------------------
11
(EQ. 1)
FN6829.5
September 21, 2011
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