SP6132H Datasheet, PDF (3/14 Pages) Sipex Corporation – High Voltage, 300KHz Synchronous PWM Controller

ELECTRICAL SPECIFICATIONS: Continued
Unless otherwise specified: 0°C < T_AMB < 70°C, 4.5V < V_CC < 5.5V, BST=V_CC,SWN = GND = ZeroV, UVIN = 3.0V, CV_CC =
10µF, C_COMP = 0.1µF, CGH = CGL = 3.3nF, C_SS = 50nF, Typical measured at V_CC=5V. The ♦ denotes the specifications
which apply over the full operating temperature range, unless otherwise specified.
PARAMETER
MIN TYP
TIMERS: SOFTSTART
SS Charge Current:
10
SS Discharge Current:
1
PROTECTION: SHORT CIRCUIT & THERMAL
Short Circuit Threshold Voltage
0.2 0.25
Hiccup Timeout
200
Number of Allowable Clock Cycles
20
at 100% Duty Cycle
Minimum GL Pulse After 20 Cycles
0.5
Thermal Shutdown Temperature
145
Thermal Recovery Temperature
135
Thermal Hysteresis
10
OUTPUT: NFET GATE DRIVERS
GH & GL Rise Times
35
GH & GL Fall Times
30
GL to GH Non Overlap Time
45
SWN to GL Non Overlap Time
25
GH & GL Pull Down Resistance
15
50
MAX UNITS
CONDITIONS
µA
mA ♦ Fault Present, SS = 0.2V
0.3
V
ms
Cycles
Cycles
°C
°C
°C
Measured V_REF (0.8V) - V_FB
V_FB = 0.5V
V_FB = 0.7V
V_FB = 0.7V
50
ns ♦ Measured 10% to 90%
40
ns ♦ Measured 90% to 10%
70
ns ♦ GH & GL Measured at 2.0V
40
ns ♦ Measured SWN = 100mV to GL = 2.0V
85 KΩ ♦
PIN DESCRIPTION
PIN #
1
2
3
4
5
6
7
8
9
10
PIN NAME DESCRIPTION
V_CC Bias Supply Input. Connect to external 5V supply. Used to power internal circuits and
low side gate driver.
GL 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 ensures low state at low voltage.
GND
V_FB
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 C_OUT.
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 V_FB drops 0.25V below the positive reference, a short circuit fault is detected
and the IC enters hiccup mode.
COMP
Output of the Error Amplifier. It is internally connected to the non-inverting input of the
PWM comparator. An optimal filter combination is chosen and connected to this pin and
either ground or V_FB to stabilize the voltage mode loop.
UVIN
UVLO input for V_IN voltage. Connect a resistor divider between V_IN and UV_IN to set
minimum operating voltage.
SS
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.
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.
GH 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 ensures low state at low voltage.
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.
Date:2/14/06
SP6132H High Voltage, Synchronous PWM Controller
3
© Copyright 2006 Sipex Corporation