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SP6132 Datasheet(PDF) 3 Page - Sipex Corporation

Part # SP6132
Description  Wide Input, 300KHz Synchronous PWM Controller
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP6132 Datasheet(HTML) 3 Page - Sipex Corporation

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Date: 8/4/04
SP6132 Wide Input, 300KHz Synchronous PWM Controller
© Copyright 2004 Sipex Corporation
PARAMETER
MIN
TYP
MAX
UNITS
CONDITIONS
TIMERS: SOFTSTART
SS Charge Current:
10
µA
SS Discharge Current:
1
mA
Fault Present, SS = 0.2V
PROTECTION: SHORT CIRCUIT & THERMAL
Short Circuit Threshold Voltage
0.2
0.25
0.3
V
Measured VREF (0.8V) - VFB
Hiccup Timeout
200
ms
VFB = 0.5V
Number of Allowable Clock Cycles
20
Cycles
VFB = 0.7V
at 100% Duty Cycle
Minimum GL Pulse After 20 Cycles
0.5
Cycles
VFB = 0.7V
Thermal Shutdown Temperature
145
°C
Thermal Recovery Temperature
135
°C
Thermal Hysteresis
10
°C
OUTPUT: NFET GATE DRIVERS
GH & GL Rise Times
35
50
ns
Measured 10% to 90%
GH & GL Fall Times
30
40
ns
Measured 90% to 10%
GL to GH Non Overlap Time
45
70
ns
GH & GL Measured at 2.0V
SWN to GL Non Overlap Time
25
40
ns
Measured SWN = 100mV to GL = 2.0V
GH & GL Pull Down Resistance
15
50
85
KΩ
Driver Pull Down Resistance
1.5
1.9
Note 1
Driver Pull Up Resistance
2.5
3.0
Note 1
ELECTRICAL SPECIFICATIONS: Continued
Unless otherwise specified: 0°C < TAMB < 70°C, 4.5V < VCC < 5.5V, BST=VCC,SWN = GND = 0V, UVIN = 3.0V, CVCC = 10µF,
CCOMP = 0.1µF, CGH = CGL = 3.3nF, CSS = 50nF, Typical measured at VCC=5V. The ♦ denotes the specifications which
apply over the -40°C to 85°C temperature range, unless otherwise specified.
PIN DESCRIPTION
PIN #
PIN NAME DESCRIPTION
1VCC
Bias Supply Input. Connect to external 5V supply. Used to power internal circuits and
low side gate driver.
2GL
High current driver output for the low side NFET switch. It is always low if GH is high or
during a fault. Resistor pull down ensure low state at low voltage.
3
GND
Ground Pin. The control circuitry of the IC and lower power driver are referenced to this
pin. Return separately from other ground traces to the (-) terminal of COUT.
4VFB
Feedback Voltage and Short Circuit Detection pin. It is the inverting input of the Error
Amplifier and serves as the output voltage feedback point for the Buck Converter. The
output voltage is sensed and can be adjusted through an external resistor divider.
Whenever VFB drops 0.25V below the positive reference, a short circuit fault is detected
and the IC enters hiccup mode.
5
COMP
Output of the Error Amplifier. It is internally connected to the inverting input of the PWM
comparator. An optimal filter combination is chosen and connected to this pin and either
ground or VFB to stabilize the voltage mode loop.
6
UVIN
UVLO input for VIN voltage. Connect a resistor divider between VIN and UVIN to set
minimum operating voltage.
7SS
Soft Start. Connect an external capacitor between SS and GND to set the soft start rate
based on the 10µA source current. The SS pin is held low via a 1mA (min) current during
all fault conditions.
8
SWN
Lower supply rail for the GH high-side gate driver. Connect this pin to the switching node
at the junction between the two external power MOSFET transistors.
9GH
High current driver output for the high side NFET switch. It is always low if GL is high or
during a fault. Resistor pull down ensure low state at low voltage.
10
BST
High side driver supply pin. Connect BST to the external boost diode and capacitor as
shown in the Typical Application Circuit on page 1. High side driver is connected between
BST pin and SWN pin.


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