HIP6014 Datasheet, PDF (4/12 Pages) Intersil Corporation – Buck and Synchronous-Rectifier (PWM) Controller and Output Voltage Monitor

HIP6014
Typical Performance Curves
1000
100
R_T PULLUP
TO +12V
10
R_T PULLDOWN TO V_SS
10
100
SWITCHING FREQUENCY (kHz)
FIGURE 1. R_T RESISTANCE vs FREQUENCY
1000
Functional Pin Description
V_SEN 1
OCSET 2
SS 3
VID0 4
VID1 5
VID2 6
VID3 7
VID4 8
COMP 9
FB 10
20 RT
19 OVP
18 VCC
17 LGATE
16 PGND
15 BOOT
14 UGATE
13 PHASE
12 PGOOD
11 GND
V_SEN (Pin 1)
This pin is connected to the converters output voltage. The
PGOOD and OVP comparator circuits use this signal to
report output voltage status and for overvoltage protection.
OCSET (Pin 2)
Connect a resistor (R_OCSET) from this pin to the drain of the
upper MOSFET. R_OCSET, an internal 200µA current source
(I_OCS), and the upper MOSFET on-resistance (r_DS(ON)) set
the converter over-current (OC) trip point according to the
following equation:
I_PEAK = ^I--^O-----^C----^S_r--_D---^•--_S--^R-₍---_O-^O---_N-^C---₎--^S----^E---^T--
An over-current trip cycles the soft-start function.
SS (Pin 3)
Connect a capacitor from this pin to ground. This capacitor,
along with an internal 10µA current source, sets the soft-
start interval of the converter.
80
70
C_GATE = 3300pF
60
C_UPPER = C_LOWER = C_GATE
50
40
C_GATE = 1000pF
30
20
10
C_GATE = 10pF
0
100 200 300 400 500 600 700 800 900 1000
SWITCHING FREQUENCY (kHz)
FIGURE 2. BIAS SUPPLY CURRENT vs FREQUENCY
VID0-4 (Pins 4-8)
VID0-4 are the input pins to the 5-bit DAC. The states of
these five pins program the internal voltage reference
(DACOUT). The level of DACOUT sets the converter output
voltage. It also sets the PGOOD and OVP thresholds. Table
1 specifies DACOUT for the 32 combinations of DAC inputs.
COMP (Pin 9) and FB (Pin 10)
COMP and FB are the available external pins of the error
amplifier. The FB pin is the inverting input of the error
amplifier and the COMP pin is the error amplifier output.
These pins are used to compensate the voltage-control
feedback loop of the converter.
GND (Pin 11)
Signal ground for the IC. All voltage levels are measured with
respect to this pin
PGOOD (Pin 12)
PGOOD is an open collector output used to indicate the
status of the converter output voltage. This pin is pulled low
when the converter output is not within ±10% of the
DACOUT reference voltage. Exception to this behavior are
the cases where the VID pins combination yield a 0V
converter output; in these cases PGOOD asserts a high
level.
PHASE (Pin 13)
Connect the PHASE pin to the upper MOSFET source. This
pin is used to monitor the voltage drop across the MOSFET
for over-current protection. This pin also provides the return
path for the upper gate drive.
UGATE (Pin 14)
Connect UGATE to the upper MOSFET gate. This pin
provides the gate drive for the upper MOSFET.
4