Datasheet

4
3
2
1
5
6
7
8
VIN
COMP1
CS1
SS1
UVLO
VCC
OUT1
GND1
GND2
OUT2
RES
SS2
CS2
COMP2
DCL
RT/SYNC
9
10
11
12
13
14
15
16
LM5032
SNVS344A –MARCH 2005–REVISED APRIL 2013 www.ti.com
Connection Diagram
Figure 2. 16-Lead TSSOP (Top View)
See Package Number PW0016A
PIN DESCRIPTION
Pin Name Description Applications Information
1 VIN Input Supply Input to the startup regulator. The operating input range is 13V to 100V with
transient capability to 105V.
2 COMP1 PWM Control, Controller 1 The COMP1 input provides voltage feedback to the PWM comparator inverting
input of Controller 1 through a 3:1 divider. The OUT1 duty cycle increases as
the COMP1 voltage increases. An internal 5KΩ pull-up resistor to +5.0V
provides bias current to an opto-coupler transistor.
3 CS1 Current Sense Input, Controller 1 Input for current mode control and the current limit sensing. If the CS1 pin
exceeds 0.5V the OUT1 pulse is terminated producing cycle-by-cycle current
limiting. External resistance connected to CS1 will adjust (increase) PWM slope
compensation. This pin's voltage must not exceed 1.25V.
4 SS1 Soft-start, Controller 1 An internal 50 µA current source charges an external capacitor to set the soft-
start rate. During a current limit restart sequence, the internal current source is
reduced to 1 µA to increase the delay before retry. Forcing SS1 below 0.5V
shuts off Controller 1.
5 UVLO VIN Under-Voltage Lockout An external resistor divider sets the input voltage threshold to enable the
LM5032. The UVLO comparator reference voltage is 1.25V. A switched 20 µA
current source provides adjustable UVLO hysteresis. The UVLO pin voltage
also controls the maximum duty cycle as described in the Functional
Description section.
6 VCC Start-up regulator output Output of the 7.7V high voltage start-up regulator. Current limit is a minimum of
19 mA.
7 OUT1 Main Gate Driver, Controller 1 Gate driver output to the primary side switch for Controller 1. OUT1 swings
between VCC and GND1 at a frequency equal to half the oscillator frequency.
8 GND1 Ground, Controller 1 Ground connection for Controller 1 including gate driver, PWM controller, soft-
start and support functions.
9 GND2 Ground, Controller 2 Ground connection for Controller 2 including the gate driver, PWM controller
and soft-start.
10 OUT2 Main Gate Driver, Controller 2 Gate driver output to the primary side switch for Controller 2. OUT2 swings
between VCC and GND2 at a frequency equal to half the oscillator frequency.
11 RES Hiccup mode restart adjust An external capacitor sets the time delay before forced restart during a
sustained period of cycle-by-cycle current limiting. The hiccup mode
comparator threshold is 2.55V.
12 SS2 Soft-start, Controller 2 An internal 50 µA current source charges an external capacitor to set the soft-
start rate. During a current limit restart sequence, the internal current source is
reduced to 1µA to increase the delay before retry. Forcing SS2 below 0.5V
shuts off Controller 2.
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