ZSPM1035C Datasheet, PDF (23/38 Pages) List of Unclassifed Manufacturers – True Digital PWM Controller (Single-Phase, Single-Rail)

ZSPM1035C / ZSPM1035D Datasheet
4.2. Pin Strap Options of the ZSPM1035C/D
The ZSPM1035C/D provides two pin-strap configuration pins. The CONFIG0 pin is used to select the nominal
output voltage of the non-isolated DC/DC converter. The CONFIG1 pin is used to select a set of compensation
loop parameters in combination with the slew rate for the output voltage during the power-up sequence. There are
four sets of compensation loop parameters that have been optimized for different ranges of output capacitance.
The CONFIG0 and CONFIG1 pins are used to determine the index of the selected values using the resistor
values listed in Table 4.2. Each pin provides 30 configuration indexes based on resistor values from the E96
series. A resistor variation of ~2% is taken into account for initial tolerance and temperature dependency. The
values are read during the initialization phase after a POR event and are then used to look up the selected index
from the pre-configured look-up tables. Based on the index read by the ZSPM1035C/D, the controller will load the
corresponding configuration from the OTP memory of the device.
Table 4.2 Pin Strap Resistor Values
Index
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Resistor Value
Using the E96 Series
0Ω
392Ω
576Ω
787Ω
1.000kΩ
1.240kΩ
1.500kΩ
1.780kΩ
2.100kΩ
2.430kΩ
2.800kΩ
3.240kΩ
3.740kΩ
4.220kΩ
4.750kΩ
Index
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Resistor Value
Using the E96 Series
5.360kΩ
6.040kΩ
6.810kΩ
7.680kΩ
8.660kΩ
9.530kΩ
10.50kΩ
11.80kΩ
13.00kΩ
14.30kΩ
15.80kΩ
17.40kΩ
19.10kΩ
21.00kΩ
23.20kΩ
4.2.1. CONFIG0 – Output Voltage
The nominal output voltage of the ZSPM1035C/D is set with a pin-strap resistor on the CONFIG0 pin. The
selectable output voltages and the corresponding pin-strap resistor index are given in Table 4.3.
The nominal output voltage set points given for the ZSPM1035C are valid without an output voltage feedback
divider. To achieve optimal performance the low pass filter consisting of resistor R5 and C7 (see Figure 4.1)
should be included in the application circuit.
The nominal output voltage set points given for the ZSPM1035D are only valid if the resistors in the output voltage
feedback divider, R4 and R5 (see Figure 4.2), have the resistances specified in Table 4.1.
© 2016 Integrated Device Technology, Inc.
23
January 25, 2016