SG3524D 查看數據表（PDF） - Philips Electronics
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SG3524D Datasheet PDF : 5 Pages
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Philips Semiconductors
SMPS control circuit
Product specification
SG3524
DC ELECTRICAL CHARACTERISTICS (Continued)
TA = 0°C to +70°C, VIN = 20V, and f = 20kHz, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
Output section (each output)
Collector-emitter voltage (breakdown)
Collector-leakage current
Saturation voltage
Emitter output voltage
tR
Rise time
tF
Fall time
Total standby current
(excluding oscillator charging current,
error and current limit dividers, and
with outputs open)
VCE=40V
IC=50mA
VIN=20V
RC=2kΩ, TA=25°C
RC=2kΩ, TA=25°C
VIN=40V
LIMITS
Min Typ Max
UNIT
40
V
0.1
50
µA
1
2
V
17
18
V
0.2
µs
0.1
µs
8
10
mA
THEORY OF OPERATION
Voltage Reference
An internal series regulator provides a nominal 5V output which is
used both to generate a reference voltage and is the regulated
source for all the internal timing and controlling circuitry. This
regulator may be bypassed for operation from a fixed 5V supply by
connecting Pins 15 and 16 together to the input voltage. In this
configuration, the maximum input voltage is 6.0V.
This reference regulator may be used as a 5V source for other
circuitry. It will provide up to 50mA of current itself and can easily be
expanded to higher currents with an external PNP as shown in
Figure 3.
Q1
+VIN
100Ω
GND
SG3524
15 REFERENCE
SECTION
8
16
VREF
+
10µF
IL to 1.0A
DEPENDING
ON CHOICE
FOR Q1
Figure 3. Expanded Reference Current Capability
SL00176
TEST CIRCUIT
IS
OSC OUT
VIN
15
3
VREF
16
8
VIN
8–40V
2k
1W
SG3524
6
7
2
1
9
10
4
12
13
11
5 14
RAMP
N.I.
INPUT
INV.
INPUT
COMP
CURRENT
SHUT LIMIT
DOWN
2k
10k
0.1
RT
CT
10k
1k
2k
1994 Aug 31
Figure 4. Test Circuit
3
2k
1W
OUTPUTS
SL00177
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