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参数资料
| 型号： | 5962R0724902QPC |
| 厂商： | INTERSIL CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, CDIP8 |
| 封装： | ROHS COMPLIANT, HERMETIC SEALED, SIDE BRAZED, CERAMIC, DIP-8 |
| 文件页数： | 14/15页 |
| 文件大小： | 760K |
| 代理商： | 5962R0724902QPC |
ISL78840ASRH, ISL78841ASRH, ISL78843ASRH, ISL78845ASRH
8
FN6991.1
August 19, 2010
Pin Descriptions
RTCT - This is the oscillator timing control pin. The
operational frequency and maximum duty cycle are set
by connecting a resistor, RT, between VREF and this pin
and a timing capacitor, CT, from this pin to GND. The
oscillator produces a sawtooth waveform with a
programmable frequency range up to 2.0MHz. The
charge time, tC, the discharge time, tD, the switching
frequency, f, and the maximum duty cycle, DMAX, can be
The formulae have increased error at higher frequencies
due to propagation delays. Figure 4 may be used as a
guideline in selecting the capacitor and resistor values
required for a given switching frequency for the
ISL78841, ISL78845ASRH. The value for the ISL78840,
ISL78843ASRH will be twice that shown in Figure 4.
COMP - COMP is the output of the error amplifier and
the input of the PWM comparator. The control loop
frequency compensation network is connected between
the COMP and FB pins.
FB - The output voltage feedback is connected to the
inverting input of the error amplifier through this pin. The
non-inverting input of the error amplifier is internally tied
to a reference voltage.
CS - This is the current sense input to the PWM
comparator. The range of the input signal is nominally 0V
to 1.0V and has an internal offset of 100mV.
GND - GND is the power and small signal reference
ground for all functions.
OUT - This is the drive output to the power switching
device. It is a high current output capable of driving the
gate of a power MOSFET with peak currents of 1.0A. This
GATE output is actively held low when VDD is below the
UVLO threshold.
VDD - VDD is the power connection for the device. The
total supply current will depend on the load applied to
OUT. Total IDD current is the sum of the operating
current and the average output current. Knowing the
operating frequency, f, and the MOSFET gate charge, Qg,
Typical Performance Curves
FIGURE 1. FREQUENCY vs TEMPERATURE
FIGURE 2. REFERENCE VOLTAGE vs TEMPERATURE
FIGURE 3. EA REFERENCE vs TEMPERATURE
FIGURE 4. RESISTANCE FOR CT CAPACITOR VALUES
GIVEN
-60
-40
-20
0
20
40
60
80
100 120 140
0.98
0.99
1.00
1.01
TEMPERATURE (°C)
NOR
M
ALIZED
FRE
Q
UENCY
-60
-40
-20
0
20
40
60
80
100
0.995
0.996
0.997
0.998
0.999
1.000
1.001
TEMPERATURE (°C)
NORMA
L
IZED
V
RE
F
140
120
-60
-40
-20
0
20
40
60
80
100 120 140
0.996
0.997
0.998
1.000
1.001
TEMPERATURE (°C)
N
O
R
M
ALIZE
D
E
A
RE
FE
RE
NCE
110
100
1
10
100
103
RT (k
Ω)
F
R
EQUE
NC
Y
(
k
Hz
)
100pF
220pF
330pF
470pF
1.0nF
2.2nF
3.3nF
4.7nF
6.8nF
t
C
0.533 RT CT
≈
(EQ. 1)
t
D
RT
–
CT In
0.008 RT
3.83
–
0.008 RT
1.71
–
---------------------------------------------
≈
(EQ. 2)
f
1t
C
t
D
+
()
=
(EQ. 3)
Dt
C f
=
(EQ. 4)
ISL78840ASRH, ISL78841ASRH, ISL78843ASRH, ISL78845ASRH
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