IP1524BD 데이터 시트보기 (PDF) - Semelab - > TT Electronics plc
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IP1524BD Datasheet PDF : 7 Pages
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SEME
LAB
IP1524B SERIES
DESCRIPTION
The IP1524B is a pulse width modulator for switching power supplies which features improved performance over
industry standards like the SG1524. A direct pin-for-pin replacement for the earlier device, it combines advanced
processing techniques and circuit design to provide improved reference accuracy/ and extended common mode range at
the error amplifier and current limit inputs. A DC-coupled flip-flop eliminates triggering and glitch problems, and a PWM
data latch prevents edge oscillations. The circuit incorporates true digital shutdown for high speed response, while an
undervoltage lockout circuit prevents spurious outputs when the supply voltage is too low for stable operation. Full
double-pulse suppression logic insures alternating output pulses when the shutdown pin is used for pulse-by-pulse
current limiting.
BLOCK DIAGRAM
VREF
16
15
+VIN
8
GND
6
RT
7
CT
REFERENCE
REGULATOR
UNDER
VOLTAGE
LOCKOUT
TO INTERNAL
CIRCUITRY
OSCILLATOR
OSC.
3
INV. 1
INPUT
2
N.I.
INPUT
+C.L. 4
SENSE
5
–C.L.
SENSE
ERROR
PWM
C.L.
10
SHUTDOWN
9
COMPENSATION
SQ
D
Q
PWM
LATCH
S
RQ
MEMORY
F/F
Q
T
Q
TOGGLE
F/F
12
CA
11
EA
13
CB
14
EB
RECOMMENDED OPERATING CONDITIONS
VIN
Input Voltage
Collector Voltage
Error Amp Common Mode Range
Current Limit Sense Common Mode Range
Output Current
(each transistor)
Reference Load Current
Oscillator Charging Current
Oscillator Frequency Range
RT
Oscillator Timing Resistor
CT
Oscillator Timing Capacitor
Operating Ambient Temperature Range
IP1524B
IP2524B
IP3524B
Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
+7 to +40V
0 to +60V
+2.3 to VREF
0 to VIN – 2.5V
0 to 200mA
0 to 20mA
25µA to 1.8mA
50Hz to 500kHz
2kΩ to 150kΩ
1nF to 0.1µF
–55 to +125°C
–25 to +85°C
0 to +70°C
Prelim. 3/95
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