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SG3524 Datasheet(PDF) 3 Page - NXP Semiconductors

Part No. SG3524
Description  SMPS control circuit
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

SG3524 Datasheet(HTML) 3 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
SG3524
SMPS control circuit
1994 Aug 31
3
DC ELECTRICAL CHARACTERISTICS (Continued)
TA = 0°C to +70°C, VIN = 20V, and f = 20kHz, unless otherwise specified.
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
Min
Typ
Max
UNIT
Output section (each output)
Collector-emitter voltage (breakdown)
40
V
Collector-leakage current
VCE=40V
0.1
50
µA
Saturation voltage
IC=50mA
1
2
V
Emitter output voltage
VIN=20V
17
18
V
tR
Rise time
RC=2kΩ, TA=25°C
0.2
µs
tF
Fall time
RC=2kΩ, TA=25°C
0.1
µs
Total standby current
(excluding oscillator charging current,
error and current limit dividers, and
with outputs open)
VIN=40V
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.
IL to 1.0A
DEPENDING
ON CHOICE
FOR Q1
VREF
Q1
100
+VIN
10
µF
+
GND
15
16
8
SG3524
REFERENCE
SECTION
SL00176
Figure 3. Expanded Reference Current Capability
TEST CIRCUIT
OSC OUT
2k
1W
2k
1W
OUTPUTS
12
13
11
14
5
4
10
9
1
2
7
6
8
16
3
15
SG3524
RAMP
N.I.
INPUT
INV.
INPUT
COMP
SHUT
DOWN
CURRENT
LIMIT
VIN
8–40V
0.1
RT
CT
2k
10k
2k
10k
1k
VREF
IS
VIN
SL00177
Figure 4. Test Circuit


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