SS6563 Datasheet, PDF (1/10 Pages) Silicon Standard Corp. – Versatile DC/DC Converter

FEATURES
Operates from 3V to 30V input voltage
Internal 2A peak current switch.
Continuous output current of 1.5A
Bootstrapped driver.
High-side current sense capability.
High efficiency (up to 90%).
Internal ±2% reference.
Low quiescent current at 1.6mA.
Operating frequency from 100Hz to 100KHz.
APPLICATIONS
Constant Current Source for Battery Chargers.
Saver for Cellular phones.
Step-Down DC/DC Converter Module.
SS6563
Versatile DC/DC Converter
DESCRIPTION
The SS6563 is a monolithic control circuit that
provides the primary functions required for DC to
DC converters and high-side-sensed constant
current sources. The device consists of an inter-
nal temperature compensated reference, com-
parator, controlled duty-cycle oscillator with an
active current-sense circuit, bootstrapped driver,
and high-current output switch. This device is
specifically designed to construct a constant cur-
rent source for battery chargers with a minimum
number of external components. A bootstrapped
driver can drive the NPN output switch to satura-
tion for higher efficiency and less heat dissipation.
The SS6563 can deliver 1.5A continuous current
without requiring a heat sink.
TYPICAL APPLICATION CIRCUIT
D3
When VIN>15V
make R1=1K
VIN
8V~25V
R1
D2
470 _1N4148
RS
0.22
+ _C1
100µF
+ ^C3
1µF
8
1
BOOST DC
7
IS
2
DE
6
VCC
3
CF
5
FB
4
GND
SS6563
1N4148
L1
300µH
+
D1
1N5819
C4
470µF
R2
390K
C2
1000pF
RB
RA ^3K
1K
5V/1A
R3
2.2M
Line Regulation
Load Regulation
Short Circuit Current
V_IN = 10V~20V @ I_O=1A
V_IN = 15V, @ I_O=100mA~1A
V_IN =15V, @ R_L = 0.1Ω
Step-Down Converter
40mV
20mV
1.3A
Rev.2.02 4/06/2004
www.SiliconStandard.com
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